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CN113233685B - A system and method for treating black liquor wastewater by separating anions - Google Patents

A system and method for treating black liquor wastewater by separating anions Download PDF

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Publication number
CN113233685B
CN113233685B CN202110583330.8A CN202110583330A CN113233685B CN 113233685 B CN113233685 B CN 113233685B CN 202110583330 A CN202110583330 A CN 202110583330A CN 113233685 B CN113233685 B CN 113233685B
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water
concentrated
black liquor
tank
pipe
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CN113233685A (en
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秦树篷
李宏秀
闫彩霞
刘进
李文杰
周保卫
王建华
杨凯
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Huadian Water Technology Co ltd
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Huadian Water Engineering Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4693Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/26Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
    • C02F2103/28Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental & Geological Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Health & Medical Sciences (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

本发明公开了一种利用分离阴离子处理黑液废水的系统,包括电渗析装置、黑液废水箱、浓水箱、淡水箱,所述电渗析装置与黑液废水箱管道连接,黑液废水箱与浓水箱管道连接,电渗析装置与淡水箱管道连接,所述浓水箱的一侧设置有蒸发装置,浓水箱与蒸发装置管道连接;同时还公开了一种利用分离阴离子处理黑液废水的方法。本发明采用单价阴离子膜,将黑液废水中的的氯离子迁移分离而去除,避免了在后续碱回收过程中的氯离子富集产生腐蚀问题。

The present invention discloses a system for treating black liquor wastewater by using separated anions, comprising an electrodialysis device, a black liquor wastewater tank, a concentrated water tank, and a fresh water tank, wherein the electrodialysis device is connected to a pipeline of the black liquor wastewater tank, the black liquor wastewater tank is connected to a pipeline of the concentrated water tank, the electrodialysis device is connected to a pipeline of the fresh water tank, an evaporation device is arranged on one side of the concentrated water tank, and the concentrated water tank is connected to a pipeline of the evaporation device; and a method for treating black liquor wastewater by using separated anions is also disclosed. The present invention adopts a monovalent anion membrane to migrate and separate the chloride ions in the black liquor wastewater and remove them, thereby avoiding the corrosion problem caused by the enrichment of chloride ions in the subsequent alkali recovery process.

Description

System and method for treating black liquor wastewater by utilizing separation anions
Technical Field
The invention relates to a system and a method for treating black liquor wastewater by utilizing separated anions, belonging to the technical field of wastewater treatment.
Background
In the sulfate pulping process of the paper industry, about 10m 3 of black liquor can be produced by each ton of chemical paddles, the main components of the black liquor comprise sodium sulfate, sodium carbonate, sodium chloride and the like, alkali recovery is needed to reduce pollution to water, sodium salt in the black liquor is converted into sodium hydroxide to be reused for digestion, the consumption of alkali can be reduced, and the pollution to water is reduced, but in the alkali recovery process, along with continuous concentration of the black liquor, chloride ions in the black liquor are also continuously enriched to a certain extent, and the chloride ions corrode process equipment and pipelines, so that the black liquor needs to be pretreated before alkali recovery.
Disclosure of Invention
The invention aims to provide a system for treating black liquor wastewater by utilizing separating anions and a method for treating black liquor wastewater by utilizing separating anions, the invention adopts the monovalent anion membrane to remove the chloride ions in the black liquor wastewater through migration and separation, thereby avoiding the corrosion problem caused by the enrichment of the chloride ions in the subsequent alkali recovery process.
The technical scheme includes that the system for treating black liquor wastewater by utilizing separated anions comprises an electrodialysis device, a black liquor wastewater tank, a concentrate tank and a fresh water tank, wherein the electrodialysis device is connected with the black liquor wastewater tank through a pipeline, the black liquor wastewater tank is connected with the concentrate tank through a pipeline, the electrodialysis device is connected with the fresh water tank through a pipeline, an evaporation device is arranged on one side of the concentrate tank, the concentrate tank is connected with the evaporation device through a pipeline, and a monovalent anion membrane is used for removing chloride ions in the black liquor wastewater through migration and separation, so that the problem of corrosion caused by enrichment of chloride ions in a subsequent alkali recovery process is avoided.
The system for treating black liquor wastewater by utilizing separated anions is characterized in that an anode, two groups of polar plates and a cathode are sequentially arranged in the electrodialysis device, a plurality of light chambers are arranged between the two groups of polar plates, the light chambers are equidistantly arranged between the two groups of polar plates, a thick chamber is arranged between every two adjacent light chambers, each light chamber comprises a monovalent negative film and a monovalent positive film, the monovalent negative film is arranged on one side close to the anode, and the positive film is arranged on one side close to the cathode.
In the system for treating black liquor wastewater by utilizing the separation anions, an anode liquid circulation area is arranged between the polar plate and the monovalent negative film, and a cathode liquid circulation area is arranged between the polar plate and the anode film.
The system for treating black liquor wastewater by utilizing the separation anions is characterized in that a first wastewater outlet pipe, a second wastewater outlet pipe and a concentrated liquor inlet pipe are arranged on a black liquor wastewater tank, one end of the first wastewater outlet pipe is connected with a water outlet of the black liquor wastewater tank, the other end of the first wastewater outlet pipe is connected with a water inlet of a light chamber, one end of the second wastewater outlet pipe is connected with the first wastewater outlet pipe, the other end of the second wastewater outlet pipe is connected with the water inlet of the light chamber, one end of the concentrated liquor inlet pipe is connected with a water outlet of the concentrated chamber, the other end of the concentrated liquor inlet pipe is connected with the water inlet of the black liquor wastewater tank, and the quantity of the wastewater outlet pipes changes according to the quantity change of the light chamber.
The system for treating black liquor wastewater by utilizing the separation anions is characterized in that a concentrated water inlet pipe and a concentrated water outlet pipe are arranged on the concentrated water tank, one end of the concentrated water inlet pipe is connected with a water outlet of the black liquor wastewater tank, the other end of the concentrated water inlet pipe is connected with a water inlet of the concentrated water tank, one end of the concentrated water outlet pipe is connected with a water outlet of the concentrated water tank, and the other end of the concentrated water outlet pipe is connected with a water inlet of the evaporation device.
The system for treating black liquor wastewater by utilizing the separation anions is characterized in that a fresh water pipe and a fresh water outlet pipe are arranged on the fresh water tank, one end of the fresh water pipe is connected with a water inlet of the fresh water tank, the other end of the fresh water pipe is connected with a water outlet of the concentration chamber, one end of the fresh water outlet pipe is connected with a water outlet of the fresh water tank, and the other end of the fresh water outlet pipe is connected with an alkali recovery device.
The system for treating black liquor wastewater by utilizing the separation anions is characterized in that a clear water tank is arranged on the fresh water pipe, a first clear water pipe and a second clear water pipe are arranged on the clear water tank, one end of the first clear water pipe is connected with a water outlet of the fresh water chamber, the other end of the first clear water pipe is connected with the clear water tank, one end of the second clear water pipe is connected with a water outlet of the fresh water chamber, the other end of the second clear water pipe is connected with the first clear water pipe, and the number of the clear water pipes is changed according to the change of the number of the fresh water chambers.
The system for treating black liquor wastewater by utilizing separation anions, wherein at least two dilute chambers are arranged.
A method for treating black liquor wastewater with separation anions, comprising the steps of:
S1, starting to operate an electrodialysis device, enabling black liquor raw water in a black liquor waste water tank to enter a fresh water chamber through a first waste water outlet pipe, enabling black liquor raw water in the black liquor waste water tank to enter the fresh water chamber through a second waste water outlet pipe, enabling clear water in the fresh water tank to enter a concentrated chamber through a pipeline, enabling cations in the black liquor raw water to migrate to a cathode in the fresh water chamber under the action of a direct current electric field of the electrodialysis device, enabling monovalent anions in the black liquor raw water to migrate to enter the concentrated chamber to form concentrated water, enabling divalent anions in the black liquor raw water to remain in the fresh water chamber to form fresh water, enabling the fresh water chamber and the concentrated chamber to be provided with pumps, enabling the fresh water to flow back through the electrodialysis device, enabling clear water in the fresh water tank to enter the fresh water tank through a fresh water pipe after the sodium sulfate content in the fresh water tank reaches 0.8-1.2%, enabling the cations in the black liquor raw water to migrate to the cathode in the fresh water chamber under the action of the direct current electric field of the electrodialysis device, enabling the monovalent anions in the black liquor raw water to migrate to enter the concentrated chamber to form concentrated water, and enabling the divalent anions in the black liquor raw water to remain in the fresh water chamber to form fresh water;
S2, enabling concentrated water in the concentrated chamber to enter a black liquor waste water tank through a concentrated water inlet pipe to obtain mixed liquor of the concentrated water and black liquor raw water, circulating and refluxing through a pump, enabling the concentrated water in the concentrated chamber to enter the concentrated water tank through the concentrated water inlet pipe after the sodium sulfate content in the mixed liquor of the concentrated water in the black liquor waste water tank and the black liquor raw water reaches 10% -15%, and enabling fresh water in the fresh chamber to enter the clean water tank through a first clean water pipe and a second clean water pipe;
S3, the mixed solution of the concentrated water in the black liquor wastewater tank and the black liquor raw water enters the concentrated water tank through a concentrated water inlet pipe, the mixed solution of the concentrated water in the concentrated water tank and the black liquor raw water enters the evaporation device through a concentrated water outlet pipe, and the fresh water in the fresh water tank enters the alkali recovery device through a fresh water outlet pipe for alkali recovery treatment.
Compared with the prior art, the method comprises an electrodialysis device, a black liquor waste water tank, a concentrated water tank and a fresh water tank, wherein the electrodialysis device is connected with the black liquor waste water tank through a pipeline, the black liquor waste water tank is connected with the concentrated water tank through a pipeline, one side of the concentrated water tank is provided with an evaporation device, the concentrated water tank is connected with the evaporation device through a pipeline, an anode, two groups of polar plates and a cathode are arranged in the electrodialysis device, a plurality of fresh-keeping chambers are arranged between the two groups of polar plates at equal intervals, a concentrated chamber is arranged between the two adjacent fresh-keeping chambers, the fresh-keeping chambers comprise monovalent anion membranes and cation membranes, the monovalent anion membranes are arranged on one side close to the anode, and the cation membranes are arranged on one side close to the cathode.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The reference sign is 1-electrodialysis device, 2-black liquor waste water tank, 3-concentrate tank, 4-fresh water tank, 5-evaporation device, 6-anode, 7-polar plate, 8-cathode, 9-fresh room, 10-concentrate room, 11-monovalent cathode membrane, 12-anode membrane, 13-anolyte circulation zone, 14-catholyte circulation zone, 15-first waste water outlet pipe, 16-second waste water outlet pipe, 17-concentrate inlet pipe, 18-concentrate inlet pipe, 19-concentrate outlet pipe, 20-fresh water pipe, 21-fresh water outlet pipe, 22-alkali recovery device, 23-clean water tank, 24-first clean water pipe, 25-second clean water pipe.
The invention is further described below with reference to the drawings and the detailed description.
Detailed Description
The embodiment 1 of the invention relates to a system for treating black liquor wastewater by utilizing separation anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline, and a monovalent anion membrane is adopted to remove chloride ions in the black liquor wastewater through migration and separation, so that the problem of corrosion caused by chloride ion enrichment in the subsequent alkali recovery process is avoided.
The embodiment 2 of the invention relates to a system for treating black liquor wastewater by utilizing separated anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline, a monovalent anion membrane is adopted to remove chloride ions in the black liquor wastewater through migration and separation, so that the problem of corrosion caused by chloride ion enrichment in the subsequent alkali recovery process is avoided, an anode 6, two groups of polar plates 7 and a cathode 8 are sequentially arranged in the electrodialysis device 1, a plurality of fresh water chambers 9 are arranged between the two groups of polar plates 7 at equal intervals, a concentrated chamber 10 is arranged between the two adjacent fresh water chambers 9, the fresh water chamber 9 comprises a monovalent anion membrane 11 and a cation membrane 12, and the cation membrane 11 is arranged on one side close to the anode 6, and the cation membrane 12 is arranged on one side close to the cathode 8.
The embodiment 3 of the invention relates to a system for treating black liquor wastewater by utilizing separated anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline, a monovalent anion membrane is adopted to remove chloride ions in the black liquor wastewater through migration and separation, so that the problem of corrosion caused by chloride ion enrichment in the subsequent alkali recovery process is avoided, an anode 6, two groups of polar plates 7 and a cathode 8 are sequentially arranged in the electrodialysis device 1, a plurality of fresh water chambers 9 are arranged between the two groups of polar plates 7, a plurality of fresh water chambers 9 are equidistantly arranged between the two groups of polar plates 7, a concentrated chamber 10 is arranged between the two adjacent fresh water chambers 9, the fresh water chambers 9 comprise a monovalent membrane 11 and a positive membrane 12, the positive membrane 11 is arranged on one side close to the anode 6, the positive membrane 12 is arranged on the other side close to the anode membrane 8, a monovalent membrane 11 is arranged between the monovalent membrane 7 and the monovalent membrane 14 is arranged, and a circulating zone of the positive membrane 14 is arranged between the monovalent membrane 7 and the circulating liquid is arranged between the positive membrane 12.
The embodiment 4 of the invention relates to a system for treating black liquor wastewater by utilizing separated anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, and the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline; the method comprises the steps of adopting a monovalent anion membrane to remove chloride ions in black liquor wastewater through migration and separation, avoiding corrosion problems caused by chloride ion enrichment in the subsequent alkali recovery process, sequentially arranging an anode 6, two groups of polar plates 7 and a cathode 8 in an electrodialysis device 1, arranging a plurality of dilute chambers 9 between the two groups of polar plates 7 at equal intervals, arranging a concentrated chamber 10 between the two adjacent dilute chambers 9, wherein the dilute chambers 9 comprise a monovalent cathode membrane 11 and an anode membrane 12, the monovalent cathode membrane 11 is arranged on one side close to the anode 6, the anode membrane 12 is arranged on one side close to the cathode 8, an anode liquid circulation area 13 is arranged between the polar plates 7 and the monovalent cathode membrane 11, a cathode liquid circulation area 14 is arranged between the polar plates 7 and the anode membrane 12, a first wastewater outlet pipe 15, a second wastewater outlet pipe 16 and a concentrated liquid inlet pipe 17 are arranged on a black liquor wastewater tank 2, one end of the first wastewater outlet pipe 15 is connected with a water outlet of the wastewater tank 2, the other end of the first wastewater outlet pipe 15 is connected with a water inlet of the dilute chamber 9, the second wastewater outlet pipe 16 is connected with one end of the first wastewater outlet pipe 16 and the concentrated liquid outlet pipe 17 is connected with one end of the wastewater outlet pipe 10, the other end of the thick liquid water inlet pipe 17 is connected with the water inlet of the black liquid waste water tank 2, and the number of the waste water outlet pipes is changed according to the number of the light chambers.
The embodiment 5 of the invention relates to a system for treating black liquor wastewater by utilizing separated anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, and the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline; the method comprises the steps of adopting a monovalent anion membrane to remove chloride ions in black liquor wastewater through migration and separation, avoiding corrosion problems caused by chloride ion enrichment in the subsequent alkali recovery process, sequentially arranging an anode 6, two groups of polar plates 7 and a cathode 8 in an electrodialysis device 1, arranging a plurality of dilute chambers 9 between the two groups of polar plates 7 at equal intervals, arranging a concentrated chamber 10 between the two adjacent dilute chambers 9, wherein the dilute chambers 9 comprise a monovalent cathode membrane 11 and an anode membrane 12, the monovalent cathode membrane 11 is arranged on one side close to the anode 6, the anode membrane 12 is arranged on one side close to the cathode 8, an anode liquid circulation area 13 is arranged between the polar plates 7 and the monovalent cathode membrane 11, a cathode liquid circulation area 14 is arranged between the polar plates 7 and the anode membrane 12, a first wastewater outlet pipe 15, a second wastewater outlet pipe 16 and a concentrated liquid inlet pipe 17 are arranged on a black liquor wastewater tank 2, one end of the first wastewater outlet pipe 15 is connected with a water outlet of the wastewater tank 2, the other end of the first wastewater outlet pipe 15 is connected with a water inlet of the dilute chamber 9, the second wastewater outlet pipe 16 is connected with one end of the first wastewater outlet pipe 16 and the concentrated liquid outlet pipe 17 is connected with one end of the wastewater outlet pipe 10, the other end of the concentrated solution water inlet pipe 17 is connected with the water inlet of the black liquor wastewater tank 2, the number of the wastewater outlet pipes is changed according to the number of the light chambers, the concentrated water tank 3 is provided with a concentrated water inlet pipe 18 and a concentrated water outlet pipe 19, one end of the concentrated water inlet pipe 18 is connected with the water outlet of the black liquor wastewater tank 2, the other end of the concentrated water inlet pipe 18 is connected with the water inlet of the concentrated water tank 3, one end of the concentrated water outlet pipe 19 is connected with the water outlet of the concentrated water tank 3, and the other end of the concentrated water outlet pipe 19 is connected with the water inlet of the evaporation device 5.
The embodiment 6 of the invention relates to a system for treating black liquor wastewater by utilizing separated anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, and the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline; the method comprises the steps of adopting a monovalent anion membrane to remove chloride ions in black liquor wastewater through migration and separation, avoiding corrosion problems caused by chloride ion enrichment in the subsequent alkali recovery process, sequentially arranging an anode 6, two groups of polar plates 7 and a cathode 8 in an electrodialysis device 1, arranging a plurality of dilute chambers 9 between the two groups of polar plates 7 at equal intervals, arranging a concentrated chamber 10 between the two adjacent dilute chambers 9, wherein the dilute chambers 9 comprise a monovalent cathode membrane 11 and an anode membrane 12, the monovalent cathode membrane 11 is arranged on one side close to the anode 6, the anode membrane 12 is arranged on one side close to the cathode 8, an anode liquid circulation area 13 is arranged between the polar plates 7 and the monovalent cathode membrane 11, a cathode liquid circulation area 14 is arranged between the polar plates 7 and the anode membrane 12, a first wastewater outlet pipe 15, a second wastewater outlet pipe 16 and a concentrated liquid inlet pipe 17 are arranged on a black liquor wastewater tank 2, one end of the first wastewater outlet pipe 15 is connected with a water outlet of the wastewater tank 2, the other end of the first wastewater outlet pipe 15 is connected with a water inlet of the dilute chamber 9, the second wastewater outlet pipe 16 is connected with one end of the first wastewater outlet pipe 16 and the concentrated liquid outlet pipe 17 is connected with one end of the wastewater outlet pipe 10, the other end of the thick liquid water inlet pipe 17 is connected with the water inlet of the black liquid water outlet tank 2, the number of the waste water outlet pipes is changed according to the number of the light chambers, the thick water inlet pipe 18 and the thick water outlet pipe 19 are arranged on the thick water tank 3, one end of the thick water inlet pipe 18 is connected with the water outlet of the black liquid water outlet tank 2, the other end of the thick water inlet pipe 18 is connected with the water inlet of the thick water tank 3, one end of the thick water outlet pipe 19 is connected with the water outlet of the thick water tank 3, the other end of the thick water outlet pipe 19 is connected with the water inlet of the evaporation device 5, the fresh water pipe 20 and the fresh water outlet pipe 21 are arranged on the light water tank 4, one end of the fresh water pipe 20 is connected with the water inlet of the light water tank 4, the other end of the fresh water pipe 20 is connected with the water outlet of the light chamber 10, one end of the fresh water outlet pipe 21 is connected with the water outlet of the light water tank 4, and the other end of the fresh water outlet pipe 21 is connected with the alkali recovery device 22.
The embodiment 7 of the invention relates to a system for treating black liquor wastewater by utilizing separated anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline, a monovalent anion membrane is adopted to remove chloride ions in the black liquor wastewater through migration and separation, so that the problem of corrosion caused by chloride ion enrichment in the subsequent alkali recovery process is avoided, and an anode 6, a cathode 6 and an anode electrode are sequentially arranged in the electrodialysis device 1, A plurality of light chambers 9 are arranged between the two groups of polar plates 7, the light chambers 9 are arranged between the two groups of polar plates 7 at equal intervals, a dense chamber 10 is arranged between the two adjacent light chambers 9, the light chambers 9 comprise a monovalent negative film 11 and a positive film 12, the monovalent negative film 11 is arranged on one side close to the anode 6, and the positive film 12 is arranged on one side close to the cathode 8; an anode liquid circulation area 13 is arranged between the polar plate 7 and the monovalent negative film 11, a cathode liquid circulation area 14 is arranged between the polar plate 7 and the positive film 12, and a first wastewater outlet pipe 15 is arranged on the black liquor wastewater tank 2, The device comprises a second wastewater outlet pipe 16 and a concentrated solution inlet pipe 17, wherein one end of a first wastewater outlet pipe 15 is connected with a water outlet of a black liquor wastewater tank 2, the other end of the first wastewater outlet pipe 15 is connected with a water inlet of a fresh water tank 9, one end of the second wastewater outlet pipe 16 is connected with the first wastewater outlet pipe 15, the other end of the second wastewater outlet pipe 16 is connected with a water inlet of the fresh water tank 9, one end of a concentrated solution inlet pipe 17 is connected with a water outlet of a concentrated chamber 10, the other end of the concentrated solution inlet pipe 17 is connected with a water inlet of the black liquor wastewater tank 2, the number of the wastewater outlet pipes varies according to the number of the fresh water tanks, a concentrated water inlet pipe 18 and a concentrated water outlet pipe 19 are arranged on the concentrated water tank 3, one end of the concentrated water inlet pipe 18 is connected with the water outlet of the black liquor wastewater tank 2, the other end of the concentrated water inlet pipe 18 is connected with the water inlet of the concentrated water tank 3, one end of the concentrated water outlet pipe 19 is connected with the water outlet of the concentrated water tank 3, the other end of the concentrated water outlet pipe 19 is connected with the water inlet of the evaporation device 5, and the first fresh water inlet pipe 19 is arranged on the concentrated water tank 4, The device comprises a second fresh water inlet pipe 20 and a fresh water outlet pipe 21, wherein one end of a first fresh water inlet pipe 19 is connected with a water inlet of a fresh water tank 4, the other end of the first fresh water inlet pipe 19 is connected with a water outlet of a fresh water chamber 9, one end of the second fresh water inlet pipe 20 is connected with the first fresh water inlet pipe 19, the other end of the second fresh water inlet pipe 20 is connected with a water outlet of the fresh water chamber 9, one end of the fresh water outlet pipe 21 is connected with a water outlet of the fresh water tank 4, the other end of the fresh water outlet pipe 21 is connected with an alkali recovery device 22, a fresh water tank 23 is arranged on the fresh water pipe 20, a first fresh water pipe 24 and a second fresh water pipe 25 are arranged on the fresh water tank 23, one end of the first fresh water pipe 24 is connected with the water outlet of the fresh water chamber 9, the other end of the first fresh water pipe 24 is connected with the fresh water tank 23, one end of the second fresh water pipe 25 is connected with the water outlet of the fresh water chamber 9, and the other end of the second fresh water pipe 25 is connected with the first fresh water pipe 24, and the quantity of the fresh water pipe varies according to the quantity of the fresh water chamber 9.
The embodiment 8 of the invention relates to a system for treating black liquor wastewater by utilizing separated anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline, a monovalent anion membrane is adopted to remove chloride ions in the black liquor wastewater through migration and separation, so that the problem of corrosion caused by chloride ion enrichment in the subsequent alkali recovery process is avoided, and an anode 6, a cathode 6 and an anode electrode are sequentially arranged in the electrodialysis device 1, A plurality of light chambers 9 are arranged between the two groups of polar plates 7, the light chambers 9 are arranged between the two groups of polar plates 7 at equal intervals, a dense chamber 10 is arranged between the two adjacent light chambers 9, the light chambers 9 comprise a monovalent negative film 11 and a positive film 12, the monovalent negative film 11 is arranged on one side close to the anode 6, and the positive film 12 is arranged on one side close to the cathode 8; an anode liquid circulation area 13 is arranged between the polar plate 7 and the monovalent negative film 11, a cathode liquid circulation area 14 is arranged between the polar plate 7 and the positive film 12, and a first wastewater outlet pipe 15 is arranged on the black liquor wastewater tank 2, The device comprises a second wastewater outlet pipe 16 and a concentrated solution inlet pipe 17, wherein one end of a first wastewater outlet pipe 15 is connected with a water outlet of a black liquor wastewater tank 2, the other end of the first wastewater outlet pipe 15 is connected with a water inlet of a fresh water tank 9, one end of the second wastewater outlet pipe 16 is connected with the first wastewater outlet pipe 15, the other end of the second wastewater outlet pipe 16 is connected with a water inlet of the fresh water tank 9, one end of a concentrated solution inlet pipe 17 is connected with a water outlet of a concentrated chamber 10, the other end of the concentrated solution inlet pipe 17 is connected with a water inlet of the black liquor wastewater tank 2, the number of the wastewater outlet pipes varies according to the number of the fresh water tanks, a concentrated water inlet pipe 18 and a concentrated water outlet pipe 19 are arranged on the concentrated water tank 3, one end of the concentrated water inlet pipe 18 is connected with the water outlet of the black liquor wastewater tank 2, the other end of the concentrated water inlet pipe 18 is connected with the water inlet of the concentrated water tank 3, one end of the concentrated water outlet pipe 19 is connected with the water outlet of the concentrated water tank 3, the other end of the concentrated water outlet pipe 19 is connected with the water inlet of the evaporation device 5, and the first fresh water inlet pipe 19 is arranged on the concentrated water tank 4, The device comprises a second fresh water inlet pipe 20 and a fresh water outlet pipe 21, wherein one end of a first fresh water inlet pipe 19 is connected with a water inlet of a fresh water tank 4, the other end of the first fresh water inlet pipe 19 is connected with a water outlet of a fresh water chamber 9, one end of the second fresh water inlet pipe 20 is connected with the first fresh water inlet pipe 19, the other end of the second fresh water inlet pipe 20 is connected with a water outlet of the fresh water chamber 9, one end of the fresh water outlet pipe 21 is connected with a water outlet of the fresh water tank 4, the other end of the fresh water outlet pipe 21 is connected with an alkali recovery device 22, a fresh water tank 23 is arranged on the fresh water pipe 20, a first fresh water pipe 24 and a second fresh water pipe 25 are arranged on the fresh water tank 23, one end of the first fresh water pipe 24 is connected with the water outlet of the fresh water chamber 9, the other end of the first fresh water pipe 24 is connected with the fresh water tank 23, one end of the second fresh water pipe 25 is connected with the water outlet of the fresh water chamber 9, the other end of the second fresh water pipe 25 is connected with the first fresh water pipe 24, the quantity of the fresh water pipe varies according to the quantity of the fresh water chamber 9, and at least two fresh water chambers 9 are arranged.
A method for treating black liquor wastewater with separation anions, comprising the steps of:
S1, starting to operate an electrodialysis device 1, enabling black liquor raw water in a black liquor waste water tank 2 to enter a fresh water chamber 9 through a first waste water outlet pipe 15, enabling black liquor raw water in the black liquor waste water tank 2 to enter the fresh water chamber 9 through a second waste water outlet pipe 16, enabling fresh water to enter a fresh water tank 23 through a first fresh water pipe 24 and a second fresh water pipe 25 after passing through the electrodialysis device 1, enabling fresh water to enter the fresh water tank 4 through a fresh water pipe 20 after the sodium sulfate content in the fresh water tank 23 reaches 0.8-1.2%, enabling fresh water in the fresh water tank 23 to enter a concentrated chamber 10 through a pipeline, enabling cations in the black liquor raw water to migrate to a cathode in the fresh water chamber 9 under the action of a direct current electric field of the electrodialysis device 1, enabling monovalent anions in the black liquor raw water to migrate to enter the concentrated chamber 10 to form concentrated water, and enabling divalent anions in the black liquor raw water to remain in the fresh water chamber 9 to form fresh water;
S2, the concentrated water in the concentrated chamber 10 enters the black liquor wastewater tank 2 through the concentrated water inlet pipe 17 to obtain mixed liquor of the concentrated water and the black liquor raw water, the mixed liquor is circulated and refluxed by a pump, when the sodium sulfate content in the mixed liquor of the concentrated water in the black liquor wastewater tank 2 and the black liquor raw water reaches 10% -15%, the mixed liquor enters the concentrated water tank 3 through the concentrated water inlet pipe 18, and the fresh water in the fresh water chamber 9 enters the clean water tank 23 through the first clean water pipe 24 and the second clean water pipe 25;
S3, the mixed solution of the concentrated water in the black liquor wastewater tank 2 and the black liquor raw water enters the concentrated water tank 3 through a concentrated water inlet pipe 18, the mixed solution of the concentrated water in the concentrated water tank 3 and the black liquor raw water enters the evaporation device 5 through a concentrated water outlet pipe 19, and the fresh water in the fresh water tank 4 enters the alkali recovery device 22 through a fresh water outlet pipe 21 for alkali recovery treatment.
The embodiment 9 of the invention relates to a system for treating black liquor wastewater by utilizing separated anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline, a monovalent anion membrane is adopted to remove chloride ions in the black liquor wastewater through migration and separation, so that the problem of corrosion caused by chloride ion enrichment in the subsequent alkali recovery process is avoided, and an anode 6, a cathode 6 and an anode electrode are sequentially arranged in the electrodialysis device 1, A plurality of light chambers 9 are arranged between the two groups of polar plates 7, the light chambers 9 are arranged between the two groups of polar plates 7 at equal intervals, a dense chamber 10 is arranged between the two adjacent light chambers 9, the light chambers 9 comprise a monovalent negative film 11 and a positive film 12, the monovalent negative film 11 is arranged on one side close to the anode 6, and the positive film 12 is arranged on one side close to the cathode 8; an anode liquid circulation area 13 is arranged between the polar plate 7 and the monovalent negative film 11, a cathode liquid circulation area 14 is arranged between the polar plate 7 and the positive film 12, and a first wastewater outlet pipe 15 is arranged on the black liquor wastewater tank 2, The device comprises a second wastewater outlet pipe 16 and a concentrated solution inlet pipe 17, wherein one end of a first wastewater outlet pipe 15 is connected with a water outlet of a black liquor wastewater tank 2, the other end of the first wastewater outlet pipe 15 is connected with a water inlet of a fresh water tank 9, one end of the second wastewater outlet pipe 16 is connected with the first wastewater outlet pipe 15, the other end of the second wastewater outlet pipe 16 is connected with a water inlet of the fresh water tank 9, one end of a concentrated solution inlet pipe 17 is connected with a water outlet of a concentrated chamber 10, the other end of the concentrated solution inlet pipe 17 is connected with a water inlet of the black liquor wastewater tank 2, the number of the wastewater outlet pipes varies according to the number of the fresh water tanks, a concentrated water inlet pipe 18 and a concentrated water outlet pipe 19 are arranged on the concentrated water tank 3, one end of the concentrated water inlet pipe 18 is connected with the water outlet of the black liquor wastewater tank 2, the other end of the concentrated water inlet pipe 18 is connected with the water inlet of the concentrated water tank 3, one end of the concentrated water outlet pipe 19 is connected with the water outlet of the concentrated water tank 3, the other end of the concentrated water outlet pipe 19 is connected with the water inlet of the evaporation device 5, and the first fresh water inlet pipe 19 is arranged on the concentrated water tank 4, The device comprises a second fresh water inlet pipe 20 and a fresh water outlet pipe 21, wherein one end of a first fresh water inlet pipe 19 is connected with a water inlet of a fresh water tank 4, the other end of the first fresh water inlet pipe 19 is connected with a water outlet of a fresh water chamber 9, one end of the second fresh water inlet pipe 20 is connected with the first fresh water inlet pipe 19, the other end of the second fresh water inlet pipe 20 is connected with a water outlet of the fresh water chamber 9, one end of the fresh water outlet pipe 21 is connected with a water outlet of the fresh water tank 4, the other end of the fresh water outlet pipe 21 is connected with an alkali recovery device 22, a fresh water tank 23 is arranged on the fresh water pipe 20, a first fresh water pipe 24 and a second fresh water pipe 25 are arranged on the fresh water tank 23, one end of the first fresh water pipe 24 is connected with the water outlet of the fresh water chamber 9, the other end of the first fresh water pipe 24 is connected with the fresh water tank 23, one end of the second fresh water pipe 25 is connected with the water outlet of the fresh water chamber 9, the other end of the second fresh water pipe 25 is connected with the first fresh water pipe 24, the quantity of the fresh water pipe varies according to the quantity of the fresh water chamber 9, and the fresh water chamber 9 is provided with two.
A method for treating black liquor wastewater with separation anions, comprising the steps of:
S1, starting to operate an electrodialysis device 1, enabling black liquor raw water in a black liquor waste water tank 2 to enter a fresh water chamber 9 through a first waste water outlet pipe 15, enabling black liquor raw water in the black liquor waste water tank 2 to enter the fresh water chamber 9 through a second waste water outlet pipe 16, enabling fresh water to enter a fresh water tank 23 through a first fresh water pipe 24 and a second fresh water pipe 25 after passing through the electrodialysis device 1, enabling fresh water to enter the fresh water tank 4 through a fresh water pipe 20 after the sodium sulfate content in the fresh water tank 23 reaches 0.8-1.2%, enabling fresh water in the fresh water tank 23 to enter a concentrated chamber 10 through a pipeline, enabling cations in the black liquor raw water to migrate to a cathode in the fresh water chamber 9 under the action of a direct current electric field of the electrodialysis device 1, enabling monovalent anions in the black liquor raw water to migrate to enter the concentrated chamber 10 to form concentrated water, and enabling divalent anions in the black liquor raw water to remain in the fresh water chamber 9 to form fresh water;
S2, the concentrated water in the concentrated chamber 10 enters the black liquor wastewater tank 2 through the concentrated water inlet pipe 17 to obtain mixed liquor of the concentrated water and the black liquor raw water, the mixed liquor is circulated and refluxed by a pump, when the sodium sulfate content in the mixed liquor of the concentrated water in the black liquor wastewater tank 2 and the black liquor raw water reaches 10% -15%, the mixed liquor enters the concentrated water tank 3 through the concentrated water inlet pipe 18, and the fresh water in the fresh water chamber 9 enters the clean water tank 23 through the first clean water pipe 24 and the second clean water pipe 25;
S3, the mixed solution of the concentrated water in the black liquor wastewater tank 2 and the black liquor raw water enters the concentrated water tank 3 through a concentrated water inlet pipe 18, the mixed solution of the concentrated water in the concentrated water tank 3 and the black liquor raw water enters the evaporation device 5 through a concentrated water outlet pipe 19, and the fresh water in the fresh water tank 4 enters the alkali recovery device 22 through a fresh water outlet pipe 21 for alkali recovery treatment.
The embodiment 10 of the invention relates to a system for treating black liquor wastewater by utilizing separated anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline, a monovalent anion membrane is adopted to remove chloride ions in the black liquor wastewater through migration and separation, so that the problem of corrosion caused by chloride ion enrichment in the subsequent alkali recovery process is avoided, and an anode 6, a cathode 6 and an anode electrode are sequentially arranged in the electrodialysis device 1, A plurality of light chambers 9 are arranged between the two groups of polar plates 7, the light chambers 9 are arranged between the two groups of polar plates 7 at equal intervals, a dense chamber 10 is arranged between the two adjacent light chambers 9, the light chambers 9 comprise a monovalent negative film 11 and a positive film 12, the monovalent negative film 11 is arranged on one side close to the anode 6, and the positive film 12 is arranged on one side close to the cathode 8; an anode liquid circulation area 13 is arranged between the polar plate 7 and the monovalent negative film 11, a cathode liquid circulation area 14 is arranged between the polar plate 7 and the positive film 12, and a first wastewater outlet pipe 15 is arranged on the black liquor wastewater tank 2, The device comprises a second wastewater outlet pipe 16 and a concentrated solution inlet pipe 17, wherein one end of a first wastewater outlet pipe 15 is connected with a water outlet of a black liquor wastewater tank 2, the other end of the first wastewater outlet pipe 15 is connected with a water inlet of a fresh water tank 9, one end of the second wastewater outlet pipe 16 is connected with the first wastewater outlet pipe 15, the other end of the second wastewater outlet pipe 16 is connected with a water inlet of the fresh water tank 9, one end of a concentrated solution inlet pipe 17 is connected with a water outlet of a concentrated chamber 10, the other end of the concentrated solution inlet pipe 17 is connected with a water inlet of the black liquor wastewater tank 2, the number of the wastewater outlet pipes varies according to the number of the fresh water tanks, a concentrated water inlet pipe 18 and a concentrated water outlet pipe 19 are arranged on the concentrated water tank 3, one end of the concentrated water inlet pipe 18 is connected with the water outlet of the black liquor wastewater tank 2, the other end of the concentrated water inlet pipe 18 is connected with the water inlet of the concentrated water tank 3, one end of the concentrated water outlet pipe 19 is connected with the water outlet of the concentrated water tank 3, the other end of the concentrated water outlet pipe 19 is connected with the water inlet of the evaporation device 5, and the first fresh water inlet pipe 19 is arranged on the concentrated water tank 4, The device comprises a second fresh water inlet pipe 20 and a fresh water outlet pipe 21, wherein one end of a first fresh water inlet pipe 19 is connected with a water inlet of a fresh water tank 4, the other end of the first fresh water inlet pipe 19 is connected with a water outlet of a fresh water chamber 9, one end of the second fresh water inlet pipe 20 is connected with the first fresh water inlet pipe 19, the other end of the second fresh water inlet pipe 20 is connected with a water outlet of the fresh water chamber 9, one end of the fresh water outlet pipe 21 is connected with a water outlet of the fresh water tank 4, the other end of the fresh water outlet pipe 21 is connected with an alkali recovery device 22, a fresh water tank 23 is arranged on the fresh water pipe 20, a first fresh water pipe 24 and a second fresh water pipe 25 are arranged on the fresh water tank 23, one end of the first fresh water pipe 24 is connected with the water outlet of the fresh water chamber 9, the other end of the first fresh water pipe 24 is connected with the fresh water tank 23, one end of the second fresh water pipe 25 is connected with the water outlet of the fresh water chamber 9, the other end of the second fresh water pipe 25 is connected with the first fresh water pipe 24, the quantity of the fresh water pipe varies according to the quantity of the fresh water chamber 9, and three fresh water chambers 9 are arranged.
A method for treating black liquor wastewater with separation anions, comprising the steps of:
S1, starting to operate an electrodialysis device 1, enabling black liquor raw water in a black liquor waste water tank 2 to enter a fresh water chamber 9 through a first waste water outlet pipe 15, enabling black liquor raw water in the black liquor waste water tank 2 to enter the fresh water chamber 9 through a second waste water outlet pipe 16, enabling fresh water to enter a fresh water tank 23 through a first fresh water pipe 24 and a second fresh water pipe 25 after passing through the electrodialysis device 1, enabling fresh water to enter the fresh water tank 4 through a fresh water pipe 20 after the sodium sulfate content in the fresh water tank 23 reaches 0.8-1.2%, enabling fresh water in the fresh water tank 23 to enter a concentrated chamber 10 through a pipeline, enabling cations in the black liquor raw water to migrate to a cathode in the fresh water chamber 9 under the action of a direct current electric field of the electrodialysis device 1, enabling monovalent anions in the black liquor raw water to migrate to enter the concentrated chamber 10 to form concentrated water, and enabling divalent anions in the black liquor raw water to remain in the fresh water chamber 9 to form fresh water;
S2, the concentrated water in the concentrated chamber 10 enters the black liquor wastewater tank 2 through the concentrated water inlet pipe 17 to obtain mixed liquor of the concentrated water and the black liquor raw water, the mixed liquor is circulated and refluxed by a pump, when the sodium sulfate content in the mixed liquor of the concentrated water in the black liquor wastewater tank 2 and the black liquor raw water reaches 10% -15%, the mixed liquor enters the concentrated water tank 3 through the concentrated water inlet pipe 18, and the fresh water in the fresh water chamber 9 enters the clean water tank 23 through the first clean water pipe 24 and the second clean water pipe 25;
S3, the mixed solution of the concentrated water in the black liquor wastewater tank 2 and the black liquor raw water enters the concentrated water tank 3 through a concentrated water inlet pipe 18, the mixed solution of the concentrated water in the concentrated water tank 3 and the black liquor raw water enters the evaporation device 5 through a concentrated water outlet pipe 19, and the fresh water in the fresh water tank 4 enters the alkali recovery device 22 through a fresh water outlet pipe 21 for alkali recovery treatment.
The embodiment 11 of the invention relates to a system for treating black liquor wastewater by utilizing separated anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline, a monovalent anion membrane is adopted to remove chloride ions in the black liquor wastewater through migration and separation, so that the problem of corrosion caused by chloride ion enrichment in the subsequent alkali recovery process is avoided, and an anode 6, a cathode 6 and an anode electrode are sequentially arranged in the electrodialysis device 1, A plurality of light chambers 9 are arranged between the two groups of polar plates 7, the light chambers 9 are arranged between the two groups of polar plates 7 at equal intervals, a dense chamber 10 is arranged between the two adjacent light chambers 9, the light chambers 9 comprise a monovalent negative film 11 and a positive film 12, the monovalent negative film 11 is arranged on one side close to the anode 6, and the positive film 12 is arranged on one side close to the cathode 8; an anode liquid circulation area 13 is arranged between the polar plate 7 and the monovalent negative film 11, a cathode liquid circulation area 14 is arranged between the polar plate 7 and the positive film 12, and a first wastewater outlet pipe 15 is arranged on the black liquor wastewater tank 2, The device comprises a second wastewater outlet pipe 16 and a concentrated solution inlet pipe 17, wherein one end of a first wastewater outlet pipe 15 is connected with a water outlet of a black liquor wastewater tank 2, the other end of the first wastewater outlet pipe 15 is connected with a water inlet of a fresh water tank 9, one end of the second wastewater outlet pipe 16 is connected with the first wastewater outlet pipe 15, the other end of the second wastewater outlet pipe 16 is connected with a water inlet of the fresh water tank 9, one end of a concentrated solution inlet pipe 17 is connected with a water outlet of a concentrated chamber 10, the other end of the concentrated solution inlet pipe 17 is connected with a water inlet of the black liquor wastewater tank 2, the number of the wastewater outlet pipes varies according to the number of the fresh water tanks, a concentrated water inlet pipe 18 and a concentrated water outlet pipe 19 are arranged on the concentrated water tank 3, one end of the concentrated water inlet pipe 18 is connected with the water outlet of the black liquor wastewater tank 2, the other end of the concentrated water inlet pipe 18 is connected with the water inlet of the concentrated water tank 3, one end of the concentrated water outlet pipe 19 is connected with the water outlet of the concentrated water tank 3, the other end of the concentrated water outlet pipe 19 is connected with the water inlet of the evaporation device 5, and the first fresh water inlet pipe 19 is arranged on the concentrated water tank 4, The device comprises a second fresh water inlet pipe 20 and a fresh water outlet pipe 21, wherein one end of a first fresh water inlet pipe 19 is connected with a water inlet of a fresh water tank 4, the other end of the first fresh water inlet pipe 19 is connected with a water outlet of a fresh water chamber 9, one end of the second fresh water inlet pipe 20 is connected with the first fresh water inlet pipe 19, the other end of the second fresh water inlet pipe 20 is connected with a water outlet of the fresh water chamber 9, one end of the fresh water outlet pipe 21 is connected with a water outlet of the fresh water tank 4, the other end of the fresh water outlet pipe 21 is connected with an alkali recovery device 22, a fresh water tank 23 is arranged on the fresh water pipe 20, a first fresh water pipe 24 and a second fresh water pipe 25 are arranged on the fresh water tank 23, one end of the first fresh water pipe 24 is connected with the water outlet of the fresh water chamber 9, the other end of the first fresh water pipe 24 is connected with the fresh water tank 23, one end of the second fresh water pipe 25 is connected with the water outlet of the fresh water chamber 9, the other end of the second fresh water pipe 25 is connected with the first fresh water pipe 24, the quantity of the fresh water pipe varies according to the quantity of the fresh water chamber 9, and at least two fresh water chambers 9 are arranged.
A method for treating black liquor wastewater with separation anions, comprising the steps of:
S1, starting to operate an electrodialysis device 1, enabling black liquor raw water in a black liquor waste water tank 2 to enter a fresh water chamber 9 through a first waste water outlet pipe 15, enabling black liquor raw water in the black liquor waste water tank 2 to enter the fresh water chamber 9 through a second waste water outlet pipe 16, enabling fresh water to enter a fresh water tank 23 through a first fresh water pipe 24 and a second fresh water pipe 25 after passing through the electrodialysis device 1, enabling fresh water to enter the fresh water tank 4 through a fresh water pipe 20 after the sodium sulfate content in the fresh water tank 23 reaches 0.8%, enabling fresh water in the fresh water tank 23 to enter a concentrated chamber 10 through a pipeline, enabling cations in the black liquor raw water to migrate to a cathode in the fresh water chamber 9 under the action of a direct current electric field of the electrodialysis device 1, enabling monovalent anions in the black liquor raw water to migrate to enter the concentrated chamber 10 to form concentrated water, and enabling divalent anions of the black liquor raw water to remain in the fresh water chamber 9 to form fresh water;
S2, the concentrated water in the concentrated chamber 10 enters the black liquor waste water tank 2 through the concentrated water inlet pipe 17 to obtain mixed liquor of the concentrated water and the black liquor raw water, the mixed liquor is circulated and refluxed by a pump, when the sodium sulfate content in the mixed liquor of the concentrated water in the black liquor waste water tank 2 and the black liquor raw water reaches 10%, the mixed liquor enters the concentrated water tank 3 through the concentrated water inlet pipe 18, and the fresh water in the fresh water chamber 9 enters the clean water tank 23 through the first clean water pipe 24 and the second clean water pipe 25;
S3, the mixed solution of the concentrated water in the black liquor wastewater tank 2 and the black liquor raw water enters the concentrated water tank 3 through a concentrated water inlet pipe 18, the mixed solution of the concentrated water in the concentrated water tank 3 and the black liquor raw water enters the evaporation device 5 through a concentrated water outlet pipe 19, and the fresh water in the fresh water tank 4 enters the alkali recovery device 22 through a fresh water outlet pipe 21 for alkali recovery treatment.
The embodiment 12 of the invention relates to a system for treating black liquor wastewater by utilizing separated anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline, a monovalent anion membrane is adopted to remove chloride ions in the black liquor wastewater through migration and separation, so that the problem of corrosion caused by chloride ion enrichment in the subsequent alkali recovery process is avoided, and an anode 6, a cathode 6 and an anode electrode are sequentially arranged in the electrodialysis device 1, A plurality of light chambers 9 are arranged between the two groups of polar plates 7, the light chambers 9 are arranged between the two groups of polar plates 7 at equal intervals, a dense chamber 10 is arranged between the two adjacent light chambers 9, the light chambers 9 comprise a monovalent negative film 11 and a positive film 12, the monovalent negative film 11 is arranged on one side close to the anode 6, and the positive film 12 is arranged on one side close to the cathode 8; an anode liquid circulation area 13 is arranged between the polar plate 7 and the monovalent negative film 11, a cathode liquid circulation area 14 is arranged between the polar plate 7 and the positive film 12, and a first wastewater outlet pipe 15 is arranged on the black liquor wastewater tank 2, The device comprises a second wastewater outlet pipe 16 and a concentrated solution inlet pipe 17, wherein one end of a first wastewater outlet pipe 15 is connected with a water outlet of a black liquor wastewater tank 2, the other end of the first wastewater outlet pipe 15 is connected with a water inlet of a fresh water tank 9, one end of the second wastewater outlet pipe 16 is connected with the first wastewater outlet pipe 15, the other end of the second wastewater outlet pipe 16 is connected with a water inlet of the fresh water tank 9, one end of a concentrated solution inlet pipe 17 is connected with a water outlet of a concentrated chamber 10, the other end of the concentrated solution inlet pipe 17 is connected with a water inlet of the black liquor wastewater tank 2, the number of the wastewater outlet pipes varies according to the number of the fresh water tanks, a concentrated water inlet pipe 18 and a concentrated water outlet pipe 19 are arranged on the concentrated water tank 3, one end of the concentrated water inlet pipe 18 is connected with the water outlet of the black liquor wastewater tank 2, the other end of the concentrated water inlet pipe 18 is connected with the water inlet of the concentrated water tank 3, one end of the concentrated water outlet pipe 19 is connected with the water outlet of the concentrated water tank 3, the other end of the concentrated water outlet pipe 19 is connected with the water inlet of the evaporation device 5, and the first fresh water inlet pipe 19 is arranged on the concentrated water tank 4, The device comprises a second fresh water inlet pipe 20 and a fresh water outlet pipe 21, wherein one end of a first fresh water inlet pipe 19 is connected with a water inlet of a fresh water tank 4, the other end of the first fresh water inlet pipe 19 is connected with a water outlet of a fresh water chamber 9, one end of the second fresh water inlet pipe 20 is connected with the first fresh water inlet pipe 19, the other end of the second fresh water inlet pipe 20 is connected with a water outlet of the fresh water chamber 9, one end of the fresh water outlet pipe 21 is connected with a water outlet of the fresh water tank 4, the other end of the fresh water outlet pipe 21 is connected with an alkali recovery device 22, a fresh water tank 23 is arranged on the fresh water pipe 20, a first fresh water pipe 24 and a second fresh water pipe 25 are arranged on the fresh water tank 23, one end of the first fresh water pipe 24 is connected with the water outlet of the fresh water chamber 9, the other end of the first fresh water pipe 24 is connected with the fresh water tank 23, one end of the second fresh water pipe 25 is connected with the water outlet of the fresh water chamber 9, the other end of the second fresh water pipe 25 is connected with the first fresh water pipe 24, the quantity of the fresh water pipe varies according to the quantity of the fresh water chamber 9, and at least two fresh water chambers 9 are arranged.
A method for treating black liquor wastewater with separation anions, comprising the steps of:
S1, starting to operate an electrodialysis device 1, enabling black liquor raw water in a black liquor waste water tank 2 to enter a fresh-water chamber 9 through a first waste water outlet pipe 15, enabling black liquor raw water in the black liquor waste water tank 2 to enter the fresh-water chamber 9 through a second waste water outlet pipe 16, enabling fresh water to enter a fresh-water tank 23 through a first fresh-water pipe 24 and a second fresh-water pipe 25 after passing through the electrodialysis device 1, enabling fresh water to enter the fresh-water tank 4 through a fresh-water pipe 20 after the sodium sulfate content in the fresh water in the fresh-water tank 23 reaches 1%, enabling fresh water in the fresh-water tank 23 to enter a concentrated chamber 10 through a pipeline, enabling cations in the black liquor raw water to migrate to a cathode in the fresh-water chamber 9 under the action of a direct-current electric field of the electrodialysis device 1, enabling monovalent anions in the black liquor raw water to migrate to enter the concentrated chamber 10 to form concentrated water, and enabling divalent anions in the black liquor raw water to remain in the fresh-water chamber 9 to form fresh water;
S2, the concentrated water in the concentrated chamber 10 enters the black liquor wastewater tank 2 through the concentrated water inlet pipe 17 to obtain mixed liquor of the concentrated water and the black liquor raw water, the mixed liquor is circulated and refluxed by a pump, when the sodium sulfate content in the mixed liquor of the concentrated water in the black liquor wastewater tank 2 and the black liquor raw water reaches 12.5%, the mixed liquor enters the concentrated water tank 3 through the concentrated water inlet pipe 18, and the fresh water in the fresh water chamber 9 enters the clean water tank 23 through the first clean water pipe 24 and the second clean water pipe 25;
S3, the mixed solution of the concentrated water in the black liquor wastewater tank 2 and the black liquor raw water enters the concentrated water tank 3 through a concentrated water inlet pipe 18, the mixed solution of the concentrated water in the concentrated water tank 3 and the black liquor raw water enters the evaporation device 5 through a concentrated water outlet pipe 19, and the fresh water in the fresh water tank 4 enters the alkali recovery device 22 through a fresh water outlet pipe 21 for alkali recovery treatment.
The embodiment 13 of the invention relates to a system for treating black liquor wastewater by utilizing separated anions, which comprises an electrodialysis device 1, a black liquor wastewater tank 2, a concentrated water tank 3 and a fresh water tank 4, wherein the electrodialysis device 1 is connected with the black liquor wastewater tank 2 through a pipeline, the black liquor wastewater tank 2 is connected with the concentrated water tank 3 through a pipeline, the electrodialysis device 1 is connected with the fresh water tank 4 through a pipeline, one side of the concentrated water tank 3 is provided with an evaporation device 5, the concentrated water tank 3 is connected with the evaporation device 5 through a pipeline, a monovalent anion membrane is adopted to remove chloride ions in the black liquor wastewater through migration and separation, so that the problem of corrosion caused by chloride ion enrichment in the subsequent alkali recovery process is avoided, and an anode 6, a cathode 6 and an anode electrode are sequentially arranged in the electrodialysis device 1, A plurality of light chambers 9 are arranged between the two groups of polar plates 7, the light chambers 9 are arranged between the two groups of polar plates 7 at equal intervals, a dense chamber 10 is arranged between the two adjacent light chambers 9, the light chambers 9 comprise a monovalent negative film 11 and a positive film 12, the monovalent negative film 11 is arranged on one side close to the anode 6, and the positive film 12 is arranged on one side close to the cathode 8; an anode liquid circulation area 13 is arranged between the polar plate 7 and the monovalent negative film 11, a cathode liquid circulation area 14 is arranged between the polar plate 7 and the positive film 12, and a first wastewater outlet pipe 15 is arranged on the black liquor wastewater tank 2, The device comprises a second wastewater outlet pipe 16 and a concentrated solution inlet pipe 17, wherein one end of a first wastewater outlet pipe 15 is connected with a water outlet of a black liquor wastewater tank 2, the other end of the first wastewater outlet pipe 15 is connected with a water inlet of a fresh water tank 9, one end of the second wastewater outlet pipe 16 is connected with the first wastewater outlet pipe 15, the other end of the second wastewater outlet pipe 16 is connected with a water inlet of the fresh water tank 9, one end of a concentrated solution inlet pipe 17 is connected with a water outlet of a concentrated chamber 10, the other end of the concentrated solution inlet pipe 17 is connected with a water inlet of the black liquor wastewater tank 2, the number of the wastewater outlet pipes varies according to the number of the fresh water tanks, a concentrated water inlet pipe 18 and a concentrated water outlet pipe 19 are arranged on the concentrated water tank 3, one end of the concentrated water inlet pipe 18 is connected with the water outlet of the black liquor wastewater tank 2, the other end of the concentrated water inlet pipe 18 is connected with the water inlet of the concentrated water tank 3, one end of the concentrated water outlet pipe 19 is connected with the water outlet of the concentrated water tank 3, the other end of the concentrated water outlet pipe 19 is connected with the water inlet of the evaporation device 5, and the first fresh water inlet pipe 19 is arranged on the concentrated water tank 4, The device comprises a second fresh water inlet pipe 20 and a fresh water outlet pipe 21, wherein one end of a first fresh water inlet pipe 19 is connected with a water inlet of a fresh water tank 4, the other end of the first fresh water inlet pipe 19 is connected with a water outlet of a fresh water chamber 9, one end of the second fresh water inlet pipe 20 is connected with the first fresh water inlet pipe 19, the other end of the second fresh water inlet pipe 20 is connected with a water outlet of the fresh water chamber 9, one end of the fresh water outlet pipe 21 is connected with a water outlet of the fresh water tank 4, the other end of the fresh water outlet pipe 21 is connected with an alkali recovery device 22, a fresh water tank 23 is arranged on the fresh water pipe 20, a first fresh water pipe 24 and a second fresh water pipe 25 are arranged on the fresh water tank 23, one end of the first fresh water pipe 24 is connected with the water outlet of the fresh water chamber 9, the other end of the first fresh water pipe 24 is connected with the fresh water tank 23, one end of the second fresh water pipe 25 is connected with the water outlet of the fresh water chamber 9, the other end of the second fresh water pipe 25 is connected with the first fresh water pipe 24, the quantity of the fresh water pipe varies according to the quantity of the fresh water chamber 9, and at least two fresh water chambers 9 are arranged.
A method for treating black liquor wastewater with separation anions, comprising the steps of:
S1, starting to operate an electrodialysis device 1, enabling black liquor raw water in a black liquor waste water tank 2 to enter a fresh water chamber 9 through a first waste water outlet pipe 15, enabling black liquor raw water in the black liquor waste water tank 2 to enter the fresh water chamber 9 through a second waste water outlet pipe 16, enabling fresh water to enter a fresh water tank 23 through a first fresh water pipe 24 and a second fresh water pipe 25 after passing through the electrodialysis device 1, enabling fresh water to enter the fresh water tank 4 through a fresh water pipe 20 after the sodium sulfate content in the fresh water tank 23 reaches 1.2%, enabling fresh water in the fresh water tank 23 to enter a concentrated chamber 10 through a pipeline, enabling cations in the black liquor raw water to migrate to a cathode in the fresh water chamber 9 under the action of a direct current electric field of the electrodialysis device 1, enabling monovalent anions in the black liquor raw water to migrate to enter the concentrated chamber 10 to form concentrated water, and enabling divalent anions of the black liquor raw water to remain in the fresh water chamber 9 to form fresh water;
s2, the concentrated water in the concentrated chamber 10 enters the black liquor waste water tank 2 through the concentrated water inlet pipe 17 to obtain mixed liquor of the concentrated water and the black liquor raw water, the mixed liquor is circulated and refluxed by a pump, when the sodium sulfate content in the mixed liquor of the concentrated water in the black liquor waste water tank 2 and the black liquor raw water reaches 15%, the mixed liquor enters the concentrated water tank 3 through the concentrated water inlet pipe 18, and the fresh water in the fresh water chamber 9 enters the clean water tank 23 through the first clean water pipe 24 and the second clean water pipe 25;
S3, the mixed solution of the concentrated water in the black liquor wastewater tank 2 and the black liquor raw water enters the concentrated water tank 3 through a concentrated water inlet pipe 18, the mixed solution of the concentrated water in the concentrated water tank 3 and the black liquor raw water enters the evaporation device 5 through a concentrated water outlet pipe 19, and the fresh water in the fresh water tank 4 enters the alkali recovery device 22 through a fresh water outlet pipe 21 for alkali recovery treatment.
When the electrodialysis device 1 works, black liquor raw water in the black liquor waste water tank 2 enters the dilute chamber 9 through the first waste water outlet pipe 15, black liquor raw water in the black liquor waste water tank 2 enters the dilute chamber 9 through the second waste water outlet pipe 16, fresh water enters the clean water tank 23 through the first clean water pipe 24 and the second clean water pipe 25 after passing through the electrodialysis device 1, and circularly flows back through a pump, when the sodium sulfate content in the fresh water in the clean water tank 23 reaches 0.8-1.2%, the fresh water enters the dilute water tank 4 through the fresh water pipe 20, clean water in the clean water tank 23 enters the concentrated chamber 10 through a pipeline, cations in the black liquor raw water migrate to a cathode in the dilute chamber 9 under the action of a direct current electric field of the electrodialysis device 1, monovalent anions in the black liquor raw water migrate to the concentrated chamber 10 to form concentrated water, and divalent anions in the black liquor remain in the dilute chamber 9 to form fresh water; the concentrated water in the concentrated chamber 10 enters the black liquor waste water tank 2 through the concentrated water inlet pipe 17 to obtain mixed liquor of the concentrated water and the black liquor raw water, the mixed liquor is circulated and flows back through a pump, when the sodium sulfate content in the mixed liquor of the concentrated water in the black liquor waste water tank 2 and the black liquor raw water reaches 10% -15%, the mixed liquor enters the concentrated water tank 3 through the concentrated water inlet pipe 18, the fresh water in the fresh water chamber 9 enters the clean water tank 23 through the first clean water pipe 24 and the second clean water pipe 25, the mixed liquor of the concentrated water in the black liquor waste water tank 2 and the black liquor raw water enters the concentrated water tank 3 through the concentrated water inlet pipe 18, the mixed liquor of the concentrated water in the concentrated water tank 3 and the black liquor raw water enters the evaporation device 5 through the concentrated water outlet pipe 19, and the fresh water in the fresh water tank 4 enters the alkali recovery device 22 through the fresh water outlet pipe 21 for alkali recovery treatment.

Claims (1)

1.一种利用分离阴离子处理黑液废水的方法,其特征在于,使用一种利用分离阴离子处理黑液废水的设备,包括电渗析装置(1)、黑液废水箱(2)、浓水箱(3)、淡水箱(4),所述电渗析装置(1)与黑液废水箱(2)管道连接,黑液废水箱(2)与浓水箱(3)管道连接,电渗析装置(1)与淡水箱(4)管道连接,所述浓水箱(3)的一侧设置有蒸发装置(5),浓水箱(3)与蒸发装置(5)管道连接;所述电渗析装置(1)内依次设置第一淡室、浓室(10)、第二淡室;1. A method for treating black liquor wastewater by using separated anions, characterized in that a device for treating black liquor wastewater by using separated anions is used, comprising an electrodialysis device (1), a black liquor wastewater tank (2), a concentrated water tank (3), and a fresh water tank (4), wherein the electrodialysis device (1) is connected to the black liquor wastewater tank (2) by a pipeline, the black liquor wastewater tank (2) is connected to the concentrated water tank (3) by a pipeline, the electrodialysis device (1) is connected to the fresh water tank (4) by a pipeline, an evaporation device (5) is arranged on one side of the concentrated water tank (3), and the concentrated water tank (3) is connected to the evaporation device (5) by a pipeline; a first fresh water chamber, a concentrated water chamber (10), and a second fresh water chamber are arranged in sequence in the electrodialysis device (1); 所述黑液废水箱(2)上设置有第一废水出水管(15)、第二废水出水管(16)和浓液进水管(17),所述第一废水出水管(15)的一端与黑液废水箱(2)的出水口连接,第一废水出水管(15)的另一端与第一淡室的进水口连接,所述第二废水出水管(16)的一端连接于第一废水出水管(15),第二废水出水管(16)的另一端与第二淡室的进水口连接,浓液进水管(17)的一端与浓室(10)的出水口连接,浓液进水管(17)的另一端与黑液废水箱(2)的进水口连接;The black liquor wastewater tank (2) is provided with a first wastewater outlet pipe (15), a second wastewater outlet pipe (16) and a concentrated liquid inlet pipe (17); one end of the first wastewater outlet pipe (15) is connected to the outlet of the black liquor wastewater tank (2); the other end of the first wastewater outlet pipe (15) is connected to the inlet of the first dilute chamber; one end of the second wastewater outlet pipe (16) is connected to the first wastewater outlet pipe (15); the other end of the second wastewater outlet pipe (16) is connected to the inlet of the second dilute chamber; one end of the concentrated liquid inlet pipe (17) is connected to the outlet of the concentrated chamber (10); the other end of the concentrated liquid inlet pipe (17) is connected to the inlet of the black liquor wastewater tank (2); 所述浓水箱(3)上设置有浓水进水管(18)和浓水出水管(19),所述浓水进水管(18)的一端与黑液废水箱(2)的出水口连接,浓水进水管(18)的另一端与浓水箱(3)的进水口连接,所述浓水出水管(19)的一端与浓水箱(3)的出水口连接,浓水出水管(19)的另一端与蒸发装置(5)的进水口连接;The concentrated water tank (3) is provided with a concentrated water inlet pipe (18) and a concentrated water outlet pipe (19), one end of the concentrated water inlet pipe (18) is connected to the water outlet of the black liquor wastewater tank (2), the other end of the concentrated water inlet pipe (18) is connected to the water inlet of the concentrated water tank (3), one end of the concentrated water outlet pipe (19) is connected to the water outlet of the concentrated water tank (3), and the other end of the concentrated water outlet pipe (19) is connected to the water inlet of the evaporation device (5); 所述淡水箱(4)上设置有淡水水管(20)和淡水出水管(21),所述淡水水管(20)上设置有清水箱(23),所述淡水水管(20)的一端与淡水箱(4)的进水口连接,淡水水管(20)的另一端与清水箱(23)的出水口连接,所述淡水出水管(21)的一端与淡水箱(4)的出水口连接,淡水出水管(21)的另一端连接有碱回收装置(22);所述清水箱(23)上设置有第一清水管(24)和第二清水管(25),第一清水管(24)的一端与第二淡室的出水口连接,第一清水管(24)的另一端与清水箱(23)连接,第二清水管(25)的一端与第一淡室的出水口连接,第二清水管(25)的另一端连接于第一清水管(24);The fresh water tank (4) is provided with a fresh water pipe (20) and a fresh water outlet pipe (21); the fresh water pipe (20) is provided with a clean water tank (23); one end of the fresh water pipe (20) is connected to the water inlet of the fresh water tank (4); the other end of the fresh water pipe (20) is connected to the water outlet of the clean water tank (23); one end of the fresh water outlet pipe (21) is connected to the water outlet of the fresh water tank (4); the other end of the fresh water outlet pipe (21) is connected to the water outlet of the fresh water tank (4); One end is connected to an alkali recovery device (22); a first clean water pipe (24) and a second clean water pipe (25) are arranged on the clean water tank (23); one end of the first clean water pipe (24) is connected to the water outlet of the second dilute chamber, the other end of the first clean water pipe (24) is connected to the clean water tank (23), one end of the second clean water pipe (25) is connected to the water outlet of the first dilute chamber, and the other end of the second clean water pipe (25) is connected to the first clean water pipe (24); 所述方法包括以下步骤:The method comprises the following steps: S1,电渗析装置(1)开始运行,黑液废水箱(2)中的黑液原水经由第一废水出水管(15)进入第一淡室,黑液废水箱(2)中的黑液原水经由第二废水出水管(16)进入第二淡室,经过电渗析装置(1)后,淡水经由第一清水管(24)和第二清水管(25)进入清水箱(23),经泵循环回流,当清水箱(23)中的淡水中硫酸钠含量达到0.8-1.2%后经由淡水水管(20)进入淡水箱(4),清水箱(23)中的清水经由管道进入浓室(10),在电渗析装置(1)直流电场作用下,黑液原水中的阳离子于第一淡室和第二淡室中向阴极迁移,黑液原水中的一价阴离子迁移进入浓室(10)形成浓水,黑液原水的二价阴离子留存在第一淡室和第二淡室形成淡水;S1, the electrodialysis device (1) starts to operate, the raw black liquor water in the black liquor wastewater tank (2) enters the first dilute chamber through the first wastewater outlet pipe (15), the raw black liquor water in the black liquor wastewater tank (2) enters the second dilute chamber through the second wastewater outlet pipe (16), after passing through the electrodialysis device (1), the fresh water enters the clean water tank (23) through the first clean water pipe (24) and the second clean water pipe (25), and is circulated back through the pump. When the sodium sulfate content in the fresh water in the clean water tank (23) reaches 0.8-1.2%, it enters the fresh water tank (4) through the fresh water pipe (20), and the clean water in the clean water tank (23) enters the concentration chamber (10) through the pipeline. Under the action of the direct current electric field of the electrodialysis device (1), the cations in the raw black liquor water migrate to the cathode in the first dilute chamber and the second dilute chamber, the monovalent anions in the raw black liquor water migrate into the concentration chamber (10) to form concentrated water, and the divalent anions in the raw black liquor water remain in the first dilute chamber and the second dilute chamber to form fresh water; S2,浓室(10)中的浓水经由浓液进水管(17)进入黑液废水箱(2),获得浓水与黑液原水的混合液,经泵循环回流,当黑液废水箱(2)中的浓水与黑液原水的混合液中硫酸钠含量达到10%-15%后经由浓水进水管(18)进入浓水箱(3),第二淡室和第一淡室中的淡水经由第一清水管(24)和第二清水管(25)进入清水箱(23);S2, the concentrated water in the concentrated chamber (10) enters the black liquor waste water tank (2) through the concentrated water inlet pipe (17), and a mixture of concentrated water and black liquor raw water is obtained, which is circulated back through a pump. When the sodium sulfate content in the mixture of concentrated water in the black liquor waste water tank (2) and black liquor raw water reaches 10%-15%, it enters the concentrated water tank (3) through the concentrated water inlet pipe (18), and the fresh water in the second dilute chamber and the first dilute chamber enters the clean water tank (23) through the first clean water pipe (24) and the second clean water pipe (25); S3,黑液废水箱(2)中的浓水与黑液原水的混合液经由浓水进水管(18)进入浓水箱(3),浓水箱(3)内的浓水与黑液原水的混合液再经由浓水出水管(19)进入蒸发装置(5);淡水箱(4)中的淡水经由淡水出水管(21)进入碱回收装置(22),进行碱回收处理。S3, the mixed liquid of the concentrated water in the black liquor waste water tank (2) and the black liquor raw water enters the concentrated water tank (3) through the concentrated water inlet pipe (18), and the mixed liquid of the concentrated water in the concentrated water tank (3) and the black liquor raw water enters the evaporation device (5) through the concentrated water outlet pipe (19); the fresh water in the fresh water tank (4) enters the alkali recovery device (22) through the fresh water outlet pipe (21) for alkali recovery treatment.
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