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CN115353262A - Esterification wastewater treatment process - Google Patents

Esterification wastewater treatment process Download PDF

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Publication number
CN115353262A
CN115353262A CN202211283094.9A CN202211283094A CN115353262A CN 115353262 A CN115353262 A CN 115353262A CN 202211283094 A CN202211283094 A CN 202211283094A CN 115353262 A CN115353262 A CN 115353262A
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sludge
treatment
tank
conveying
wastewater
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Inventor
朱勇
毕伶俐
朱继良
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Weihai Lanchuang Environmental Protection Equipment Co ltd
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Weihai Lanchuang Environmental Protection Equipment Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • 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
    • 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
    • C02F1/048Purification of waste water by evaporation
    • 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
    • C02F1/28Treatment of water, waste water, or sewage by sorption
    • 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
    • C02F1/30Treatment of water, waste water, or sewage by irradiation
    • C02F1/302Treatment of water, waste water, or sewage by irradiation with microwaves
    • 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
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104Devices therefor; Their operating or servicing
    • C02F1/46176Galvanic cells
    • 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
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • 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
    • C02F2103/34Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/36Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
    • C02F2103/38Polymers
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • C02F3/12Activated sludge processes
    • C02F3/1236Particular type of activated sludge installations
    • C02F3/1268Membrane bioreactor systems
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

The invention discloses an esterification wastewater treatment process, which belongs to the field of wastewater treatment and comprises the following steps: the method comprises the steps of air stripping, sludge mixing, precipitation, ultrafiltration, micro-electrolysis, microwave treatment, anaerobic treatment, contact oxidation and MBR treatment, the sludge mixing tank is utilized to carry out sectional treatment on pollutants in the esterification wastewater, the precipitation part is subjected to microwave treatment to destroy the stability of refractory organic matters, the sludge is cracked while the biodegradability of the wastewater is improved, the micro-wastewater provides necessary nutrient substances, the other part of wastewater is subjected to ultrafiltration and micro-electrolysis treatment to directly improve the biodegradability of the wastewater, and finally the anaerobic treatment, contact oxidation and MBR treatment are carried out, so that the aim of esterification wastewater with low energy consumption and high efficiency biochemical treatment is fulfilled.

Description

Esterification wastewater treatment process
Technical Field
The invention relates to the field of wastewater treatment, in particular to an esterification wastewater treatment process.
Background
The esterification wastewater is various wastewater generated in the polyester production process, has complex components, low pH and high COD, but has poor biodegradability due to a large amount of aromatic compounds and oligomers contained in the wastewater. The traditional treatment method of the esterification wastewater is to burn organic matters after steam stripping, so as to recover heat and save part of fuel. However, such waste water contains acetaldehyde and ethylene glycol, which causes waste due to burning, and also generates highly toxic substances due to incomplete combustion in the burning process, so if the biodegradability of the esterification waste water can be improved, the realization of the biochemical treatment of the waste water is the key point for solving the problem of difficult treatment of the esterification waste water.
However, the esterification wastewater has low content of N and P, so that the normal nutritional requirement of biochemical treatment is difficult to maintain, meanwhile, the biodegradability of COD is further reduced due to the recovery of acetaldehyde and ethylene glycol, and the toxicity of the wastewater is high due to the existence of a benzene ring structure in the wastewater, so that the possibility of biochemical treatment is further reduced.
Chinese patent No. CN111039511B discloses a modular integrated process for treating chemical recovery wastewater, which utilizes a pretreatment module, a biochemical module and an advanced treatment module to treat esterification wastewater, however, the process utilizes fenton reaction and electrochemical reaction to degrade refractory organics, thereby improving the biodegradability of wastewater, but a large amount of hydrogen peroxide, ferrous ions and the like need to be added, so that not only is the treatment cost greatly improved, but also iron ions can be introduced into wastewater, and simultaneously, a large amount of energy is consumed during electrochemical reaction. The final treatment cost is very high, and the wide-range popularization is difficult.
Therefore, the problem to be solved at present is to provide an esterification wastewater treatment process which can realize low energy consumption and high-efficiency biochemical treatment.
Disclosure of Invention
The embodiment of the invention provides an esterification wastewater treatment process, which comprises the following steps:
(1) Gas stripping: introducing esterification wastewater and steam into a stripping tower for treatment, wherein the heat transfer medium of the stripping tower is steam, introducing organic matter gas and steam collected at the tower top into an acetaldehyde rectifying tower, and collecting wastewater at the tower bottom of the stripping tower;
(2) Sludge mixing: conveying the waste water collected at the bottom of the gas stripping tower to a sludge mixing tank, and adding excess sludge into the sludge mixing tank, wherein a plurality of stirring devices are arranged in the sludge mixing tank, the stirring speed of each stirring device is 300-800r/min, the mixing time is 20-30min, and the adding amount of the excess sludge is 20-40g/L based on the dry weight of the sludge;
(3) And (3) precipitation: conveying the mixed liquid in the sludge mixing tank to a sedimentation tank for sedimentation treatment, wherein the sedimentation time is 1-3h;
(4) And (3) ultrafiltration: conveying the supernatant in the sedimentation tank to an ultrafiltration device for ultrafiltration treatment, wherein the ultrafiltration device adopts PAN and PVDP membranes, and the working pressure is 0.2-0.4MPa;
(5) Micro-electrolysis: conveying the water outlet of the ultrafiltration device to a micro-electrolysis process for treatment;
(6) Microwave treatment: conveying the sludge mixed liquor settled in the settling tank to a microwave treatment process for microwave treatment, wherein the power of the microwave treatment is 700-1000W, and the reaction time is 7-10 min;
(7) Anaerobic treatment: conveying the sludge mixed liquor after the microwave treatment and the micro-electrolysis effluent to an anaerobic tank for anaerobic treatment;
(8) Contact oxidation: conveying the anaerobic effluent to a contact oxidation tank for treatment;
(9) MBR: and (4) conveying the effluent of the contact oxidation to an MBR tank for treatment.
Further, sludge generated in the anaerobic tank, the contact oxidation tank and the MBR tank is conveyed to a plate-and-frame filter for dehydration treatment to obtain dehydrated sludge, and the water content of the dehydrated sludge is 75-80%.
Further, the residual sludge added in the sludge mixing tank is dewatered sludge.
Further, air-drying the dewatered sludge to obtain air-dried sludge, wherein the water content of the air-dried sludge is 40-50%.
Further, the air-dried sludge is added into the sludge mixing tank, and the dry weight ratio of the added amount of the air-dried sludge to the dehydrated sludge is (1).
Further, concentrated water generated by the ultrafiltration device is conveyed to the microwave treatment process.
Further, the dewatered sludge is firstly added into the sludge mixing tank, then stirred and mixed for 10-15min, and then air-dried sludge is added into the sludge mixing tank for stirring and mixing.
Further, the sludge mixed liquor after the microwave treatment and the micro-electrolysis effluent are conveyed to an adjusting tank for pH adjustment before entering an anaerobic tank, and the pH is adjusted to 6-8.
Further, calcium hydroxide is added into the adjusting tank to adjust the pH value.
Further, the supernatant of the adjusting tank is conveyed to the anaerobic tank.
Compared with the prior art, according to the scheme of the embodiment of the invention, a sludge mixing process is arranged, in the sludge mixing process, sludge can adsorb organic pollutants in wastewater, dewatered sludge and dried sludge are added step by step under the stirring effect, and macromolecular pollutants in the wastewater are adsorbed on the surface of the sludge through the adsorption effect and the sedimentation effect;
conveying the sludge mixed liquor after precipitation separation to a microwave treatment process, wherein under the action of microwaves, benzene ring structures on the surface of the sludge are opened, and microbial cells of the sludge are cracked under the action of microwaves, so that the content of nutrient substances in the wastewater is increased, and the biodegradability of the wastewater is further improved;
after the supernatant of the sedimentation tank is subjected to ultrafiltration treatment, the ultrafiltration effluent is subjected to micro-electrolysis treatment to further reduce the concentration of pollutants in the wastewater, a small amount of iron ions are generated in the micro-electrolysis process, the micro-electrolysis effluent and the sludge mixed liquid after microwave treatment enter a regulating tank and are subjected to alkali addition regulation, a sedimentation reaction occurs in the regulating tank, and part of pollutants can be separated into the wastewater by settled floc; meanwhile, the effluent of the regulating tank meets the treatment conditions of the anaerobic tank, so that the anaerobic treatment, the contact oxidation and the normal MBR treatment can be realized;
the sludge mixed liquid after microwave treatment is mixed with micro-electrolysis effluent, and the pH value of the sludge mixed liquid is adjusted, so that iron ions entering wastewater in the micro-electrolysis process can be removed, large particle substances in sludge are reduced, and the content of solid substances in the wastewater is reduced.
Drawings
FIG. 1 is a schematic diagram of an esterification wastewater treatment process according to an embodiment of the present invention;
FIG. 2 is a schematic view of an esterification wastewater treatment process according to an embodiment of the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations such as "comprises" or "comprising", etc., will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Example 1
Esterification wastewater generated by a certain polyester chemical industry enterprise: pH2-3, COD29000-32000mg/L, see figure 1;
(1) Gas stripping: the esterification wastewater and steam enter a stripping tower for treatment, the heat transfer medium of the stripping tower is steam, the organic matter gas and the steam collected at the tower top enter an acetaldehyde rectification tower, and the wastewater is collected at the tower bottom of the stripping tower, wherein the COD is 5800mg/L and the BOD is BOD 5 /COD<0.1;
(2) Sludge mixing: conveying the waste water collected at the bottom of the gas stripping tower to a sludge mixing tank, and adding excess sludge into the sludge mixing tank, wherein a plurality of stirring devices are arranged in the sludge mixing tank, the stirring speed of each stirring device is 300-800r/min, the mixing time is 20-30min, and the adding amount of the excess sludge is 20-40g/L based on the dry weight of the sludge;
(3) And (3) precipitation: conveying the mixed liquid in the sludge mixing tank to a sedimentation tank for sedimentation treatment, wherein the sedimentation time is 1-3h;
(4) And (3) ultrafiltration: conveying the supernatant in the sedimentation tank to an ultrafiltration device for ultrafiltration treatment, wherein the ultrafiltration device adopts PAN and PVDP membranes, and the working pressure is 0.2-0.4MPa;
(5) Micro-electrolysis: conveying the water outlet of the ultrafiltration device to a micro-electrolysis process for treatment;
(6) Microwave treatment: conveying the sludge mixed liquor settled in the settling pond to a microwave treatment process for microwave treatment, wherein the power of the microwave treatment is 700-1000W, and the reaction time is 7-10 min;
(7) Anaerobic treatment: conveying the sludge mixed liquor after the microwave treatment and the micro-electrolysis effluent to an anaerobic tank for anaerobic treatment;
(8) Contact oxidation: conveying the anaerobic effluent to a contact oxidation tank for treatment;
(9) MBR: conveying the effluent of the contact oxidation to an MBR tank for treatment;
and (3) water outlet condition: pH6.0-7.5, COD93mg/L.
Example 2
Esterification wastewater generated by a certain polyester chemical industry enterprise: pH2-3, COD29000-32000mg/L;
(1) Gas stripping: the esterification wastewater and steam enter a stripping tower for treatment, the heat transfer medium of the stripping tower is steam, the organic matter gas and the steam collected at the tower top enter an acetaldehyde rectification tower, and the wastewater is collected at the tower bottom of the stripping tower, wherein the COD is 5800mg/L and the BOD is BOD 5 /COD<0.1;
(2) Sludge mixing: conveying the waste water collected at the bottom of the gas stripping tower to a sludge mixing pool, and simultaneously adding excess sludge into the sludge mixing pool, wherein a plurality of stirring devices are arranged in the sludge mixing pool, the stirring speed of each stirring device is 300-800r/min, the mixing time is 20-30min, and the adding amount of the excess sludge is 20-40g/L based on the dry weight of the sludge; conveying sludge generated in the anaerobic tank, the contact oxidation tank and the MBR tank to a plate-and-frame filter for dehydration treatment to obtain dehydrated sludge, wherein the water content of the dehydrated sludge is 75-80%; the excess sludge added into the sludge mixing tank is dewatered sludge; air-drying the dewatered sludge to obtain air-dried sludge, wherein the water content of the air-dried sludge is 40-50%, the air-dried sludge is also added into the sludge mixing tank, and the dry-weight ratio of the added amount of the air-dried sludge to the dewatered sludge is 1-5; adding the dehydrated sludge into the sludge mixing tank, stirring and mixing for 10-15min, and then adding air-dried sludge for stirring and mixing;
(3) And (3) precipitation: conveying the mixed liquor in the sludge mixing tank to a sedimentation tank for sedimentation for 1-3h;
(4) And (3) ultrafiltration: conveying the supernatant in the sedimentation tank to an ultrafiltration device for ultrafiltration treatment, wherein the ultrafiltration device adopts PAN and PVDP membranes, and the working pressure is 0.2-0.4MPa;
(5) Micro-electrolysis: conveying the water outlet of the ultrafiltration device to a micro-electrolysis process for treatment;
(6) Microwave treatment: conveying the sludge mixed liquor settled in the settling tank to a microwave treatment process for microwave treatment, wherein the power of the microwave treatment is 700-1000W, and the reaction time is 7-10 min;
(7) Anaerobic treatment: conveying the sludge mixed liquor after the microwave treatment and the micro-electrolysis effluent to an anaerobic tank for anaerobic treatment;
(8) Contact oxidation: conveying the anaerobic effluent to a contact oxidation tank for treatment;
(9) MBR: conveying the effluent of the contact oxidation to an MBR tank for treatment;
and (3) water outlet condition: pH6.3-7.3, COD68mg/L.
Example 3
Esterification wastewater generated by a certain polyester chemical industry enterprise: pH2-3, COD29000-32000mg/L, see figure 2;
(1) Gas stripping: the esterification wastewater and steam enter a stripping tower for treatment, the heat transfer medium of the stripping tower is steam, the organic matter gas and the steam collected at the top of the stripping tower enter an acetaldehyde rectifying tower, and the organic matter gas and the steam enter a rectification towerWaste water is collected at the bottom of the stripping tower, COD is 5800mg/L, BOD 5 /COD<0.1;
(2) Sludge mixing: conveying the waste water collected at the bottom of the gas stripping tower to a sludge mixing tank, and adding excess sludge into the sludge mixing tank, wherein a plurality of stirring devices are arranged in the sludge mixing tank, the stirring speed of each stirring device is 300-800r/min, the mixing time is 20-30min, and the adding amount of the excess sludge is 20-40g/L based on the dry weight of the sludge; conveying sludge generated in the anaerobic tank, the contact oxidation tank and the MBR tank to a plate-and-frame filter for dehydration treatment to obtain dehydrated sludge, wherein the water content of the dehydrated sludge is 75-80%; the excess sludge added into the sludge mixing tank is dewatered sludge; air-drying the dewatered sludge to obtain air-dried sludge, wherein the water content of the air-dried sludge is 40-50%, the air-dried sludge is also added into the sludge mixing tank, and the dry-weight ratio of the added amount of the air-dried sludge to the dewatered sludge is 1-5; adding the dehydrated sludge into the sludge mixing tank, stirring and mixing for 10-15min, and then adding air-dried sludge for stirring and mixing;
(3) And (3) precipitation: conveying the mixed liquor in the sludge mixing tank to a sedimentation tank for sedimentation for 1-3h;
(4) And (3) ultrafiltration: conveying the supernatant in the sedimentation tank to an ultrafiltration device for ultrafiltration treatment, wherein the ultrafiltration device adopts PAN and PVDP membranes, and the working pressure is 0.2-0.4MPa;
(5) Micro-electrolysis: conveying a water outlet of the ultrafiltration device to a micro-electrolysis process for treatment;
(6) Microwave treatment: conveying the sludge mixed liquor settled in the settling pond to a microwave treatment process for microwave treatment, wherein the power of the microwave treatment is 700-1000W, and the reaction time is 7-10 min;
(7) Anaerobic treatment: conveying the sludge mixed liquor subjected to microwave treatment and the micro-electrolysis effluent to an adjusting tank for pH adjustment before entering an anaerobic tank, adjusting the pH to 6-8, and conveying the supernatant of the adjusting tank to the anaerobic tank;
(8) Contact oxidation: conveying the anaerobic effluent to a contact oxidation tank for treatment;
(9) MBR: conveying the effluent of the contact oxidation to an MBR tank for treatment;
and (4) water outlet condition: pH6.7-7.3, COD52mg/L.
Example 4
On the basis of example 3, domestic sewage is added into a regulating tank, and the volume ratio of the domestic sewage to the polyester production wastewater is 1.
And (3) water outlet condition: pH6.7-7.3, COD27mg/L.
The foregoing description of specific exemplary embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (10)

1. An esterification wastewater treatment process is characterized by comprising the following steps:
(1) Gas stripping: introducing esterification wastewater and steam into a stripping tower for treatment, wherein the heat transfer medium of the stripping tower is steam, introducing organic matter gas and steam collected at the tower top into an acetaldehyde rectifying tower, and collecting wastewater at the tower bottom of the stripping tower;
(2) Sludge mixing: conveying the waste water collected at the bottom of the gas stripping tower to a sludge mixing tank, and adding excess sludge into the sludge mixing tank, wherein a plurality of stirring devices are arranged in the sludge mixing tank, the stirring speed of each stirring device is 300-800r/min, the mixing time is 20-30min, and the adding amount of the excess sludge is 20-40g/L based on the dry weight of the sludge;
(3) And (3) precipitation: conveying the mixed liquor in the sludge mixing tank to a sedimentation tank for sedimentation for 1-3h;
(4) And (3) ultrafiltration: conveying the supernatant in the sedimentation tank to an ultrafiltration device for ultrafiltration treatment, wherein the ultrafiltration device adopts PAN and PVDP membranes, and the working pressure is 0.2-0.4MPa;
(5) Micro-electrolysis: conveying the water outlet of the ultrafiltration device to a micro-electrolysis process for treatment;
(6) Microwave treatment: conveying the sludge mixed liquor settled in the settling pond to a microwave treatment process for microwave treatment, wherein the power of the microwave treatment is 700-1000W, and the reaction time is 7-10 min;
(7) Anaerobic treatment: conveying the sludge mixed liquor after the microwave treatment and the micro-electrolysis effluent to an anaerobic tank for anaerobic treatment;
(8) Contact oxidation: conveying the anaerobic effluent to a contact oxidation tank for treatment;
(9) MBR: and (4) conveying the effluent of the contact oxidation to an MBR tank for treatment.
2. The esterification wastewater treatment process according to claim 1, wherein the sludge generated in the anaerobic tank, the contact oxidation tank and the MBR tank is conveyed to a plate-and-frame filter for dehydration treatment to obtain dehydrated sludge, and the water content of the dehydrated sludge is 75-80%.
3. The esterification wastewater treatment process according to claim 2, wherein the excess sludge added to the sludge mixing tank is the dewatered sludge.
4. The esterification wastewater treatment process according to claim 2, wherein the dewatered sludge is air-dried to obtain air-dried sludge having a water content of 40 to 50%.
5. The esterification wastewater treatment process according to claim 4, wherein the air-dried sludge is further added into the sludge mixing tank, and the dry weight ratio of the added amount of the air-dried sludge to the dehydrated sludge is 1.
6. The esterification waste water treatment process according to claim 1, wherein the concentrated water produced by the ultrafiltration apparatus is fed to the microwave treatment process.
7. The esterification wastewater treatment process according to claim 4 or 5, wherein the dewatered sludge is added to the sludge mixing tank, stirred and mixed for 10-15min, and then air-dried sludge is added to the sludge mixing tank, and stirred and mixed.
8. The esterification wastewater treatment process according to claim 1, wherein the sludge mixed liquor after the microwave treatment and the micro-electrolysis effluent are conveyed to a regulating tank for pH regulation before entering an anaerobic tank, and the pH is regulated to 6 to 8.
9. The esterification wastewater treatment process according to claim 8, wherein the pH adjustment is performed by adding calcium hydroxide to the adjustment tank.
10. The esterification wastewater treatment process of claim 8, wherein the conditioning tank supernatant is delivered to the anaerobic tank.
CN202211283094.9A 2022-10-20 2022-10-20 Esterification wastewater treatment process Pending CN115353262A (en)

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CN105254131A (en) * 2015-11-07 2016-01-20 宜兴华谊着色科技有限公司 Indiscriminately using method for ferric oxide technical water
CN108033630A (en) * 2017-11-30 2018-05-15 广州漓源环保技术有限公司 A kind of esterified waste water treatment process
CN112499905A (en) * 2020-12-01 2021-03-16 严惠琴 Organophosphorus wastewater treatment system
CN113429084A (en) * 2021-07-30 2021-09-24 广州茂绿环保科技有限公司 Process for treating and recycling domestic sewage and industrial wastewater in industrial park

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010000476A (en) * 2008-06-23 2010-01-07 Kanto Auto Works Ltd Organic wastewater treatment method and apparatus
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