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.