CN108911259B - System and process for treating polyvinyl chloride organic wastewater - Google Patents
System and process for treating polyvinyl chloride organic wastewater Download PDFInfo
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000003456 ion exchange resin Substances 0.000 claims description 6
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- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 208000001647 Renal Insufficiency Diseases 0.000 description 1
- 241000589651 Zoogloea Species 0.000 description 1
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- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/422—Treatment of water, waste water, or sewage by ion-exchange using anionic exchangers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/78—Details relating to ozone treatment devices
- C02F2201/782—Ozone generators
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
Abstract
The invention relates to the field of treatment and reutilization of organic wastewater in the polyvinyl chloride industry, in particular to a system and a method for treating the organic wastewater of the polyvinyl chloride, which sequentially perform cooling, aeration biochemistry, fiber filtration, ozone oxidation, active carbon filtration, sintering PE precise filtration, cation resin adsorption, decarburization, anion resin adsorption and sintering stainless steel precise filtration operation, reduce COD and conductivity of the organic wastewater in steps, and finally obtain pure water for reuse in a polyvinyl chloride production process. The system and the method solve the problems of treatment and reutilization of organic wastewater in the existing polyvinyl chloride industry, save water resources, reduce water cost in the polyvinyl chloride industry, effectively realize the purposes of energy conservation, emission reduction and environmental protection, and can be used for treatment and reutilization of organic wastewater in the polyvinyl chloride industry.
Description
Technical Field
The invention relates to the field of treatment and reutilization of waste water containing polyvinyl chloride, in particular to a system and a method for deeply treating waste water generated in the polyvinyl chloride production process.
Background
Polyvinyl chloride wastewater belongs to low-concentration chemical wastewater which is difficult to degrade, and the wastewater has toxicity or is difficult to biodegrade although the concentration of organic matters is low. CODCr is generally 100-400mg/L and BOD/COD is about 0.04. The method is characterized in that: the polyvinyl alcohol is a main pollutant with large water content, large turbidity and low hardness, and further contains vinyl chloride monomer and other additives. Such as bisphenol a, hydroquinone, methanol, etc. The acute toxicity of vinyl chloride is manifested as an anesthetic effect. Long-time contact can cause dizziness, chest distress and finally chloroethylene disease. Bisphenol a can cause liver function and renal failure. Hydroquinone has carcinogenic and mutagenic properties. PVA, cellulose and the like used in PVC production are macromolecular substances, and the residual substances after biochemical treatment are super macromolecular substances which are difficult to degrade.
In both the calcium carbide process and the ethylene process, a large amount of organic wastewater (centrifugal mother liquor) is produced in the process of producing polyvinyl chloride, about 3.5 tons of pure water is required for producing one ton of PVC, 1.25 tons of tap water is required for producing one ton of pure water, and 0.25 ton of high-salt wastewater is also produced. The production of PVC not only wastes a large amount of tap water, generates a large amount of organic wastewater, but also generates a large amount of high-salt wastewater, and the treatment of the high-salt wastewater is a worldwide problem. Whether water for producing polyvinyl chloride can find a way is a realistic problem faced by polyvinyl chloride production enterprises. Therefore, it is necessary to develop new technology to enhance the recycling of the centrifugal mother liquor, thereby reducing the groundwater utilization amount and the high-salt wastewater production, and saving energy and protecting environment.
At present, the main treatment modes of PVC wastewater are as follows: (1) coagulation method: the method can remove a small amount of PVC suspended particles, but has low removal rate for soluble COD. (2) Biochemical method: the PVA degrading bacteria has low production rate by adopting the conventional biological treatment process, and the waste water is difficult to treat by the traditional activated sludge process. (3) ultrafiltration membrane method: PVA colloids often cause clogging of filter pores, the filter membrane cannot be backwashed and regenerated, and the method is high in cost. However, the wastewater treated by the method is difficult to recycle.
Chinese patent document CN101525198A discloses a method for treating and recycling polyvinyl chloride wastewater. The method comprises the following steps: recovering polyvinyl chloride particles, cooling, hydrolyzing and acidifying, aerating, degrading organic matters, sterilizing, disinfecting, ion exchanging, recycling and the like. The COD of the wastewater treated by the method is less than 10mg/L. The disadvantage is that the method lacks filtration measures, and the residual bacterial cells and zoogloea consume ozone after aeration.
Chinese patent document CN101343132a discloses a method for treating polyvinyl chloride wastewater, which comprises the following steps: and (3) recycling PVC particles, cooling, coagulating sedimentation, ozone oxidation, biological aerated filter treatment, ultrafiltration treatment, reverse osmosis treatment and ion exchange treatment. The wastewater treated by the method can basically reach the treatment standard. However, the wastewater treated by the method may cause that organic matters, high molecular compounds and harmful substances in the effluent are not easy to remove.
Therefore, if organic matters and ions in the polyvinyl chloride organic wastewater are not effectively removed, the treated wastewater is difficult to recycle, and the waste of water resources is caused. Considering the utilization value of water resources, the problems of advanced treatment and reuse of the organic wastewater in the polyvinyl chloride industry are urgently needed to be solved.
With the increasing of the national importance of environmental protection and the development of the technology for treating the polyvinyl chloride organic wastewater, the technology for treating the polyvinyl chloride organic wastewater can meet the national standard requirements, but the discharge of the treated wastewater causes the waste of water resources, and the operation cost of enterprises is additionally increased, so that a new technology for deeply treating and reutilizing the polyvinyl chloride organic wastewater is urgently needed. At present, a system and a method for deeply treating the polyvinyl chloride organic wastewater and recycling the polyvinyl chloride organic wastewater are not reported yet.
Disclosure of Invention
Aiming at the defects, the invention provides a system and a method for deeply treating polyvinyl chloride organic wastewater, which sequentially perform cooling, aeration biochemistry, fiber filtration, ozone oxidation, active carbon filtration, sintering PE precise filtration, cation resin adsorption, decarburization, anion resin adsorption and sintering stainless steel precise filtration, reduce COD and conductivity of the organic wastewater in steps, and reuse the obtained pure water in a polyvinyl chloride production process to realize reuse of the polyvinyl chloride wastewater, thereby protecting water environment and saving water resources.
In a first aspect of the invention, a treatment system for polyvinyl chloride organic wastewater is provided, which comprises a cooling tower, a biochemical system, a fiber filter, an ozone reactor, an activated carbon filter, a PE sintering filter, a cation exchanger, a decarburization tower, an anion exchanger, a stainless steel sintering filter and a pure water storage tank which are connected in sequence through pipelines.
Preferably, the ozone reactor is also provided with an ozone generating system, the ozone generating system comprises a blower, an oxygenerator and an ozone generator, which are sequentially communicated through pipelines, and the system is two-in-one. The ozone outlet of the ozone generator is connected with the ozone inlet at the bottom of the ozone reactor.
Preferably, the capacity of the ozone generator is 3-30 kg/h, more preferably 5-20 kg/h.
Preferably, the cooling tower is a glass fiber reinforced plastic outdoor cooling tower without packing.
Preferably, the biochemical system comprises an aerobic tank and an anaerobic tank, wherein the concentration of dissolved oxygen in the aerobic tank is 5-8 mg/L, and the concentration of dissolved oxygen in the anaerobic tank is 0.5-3mg/L.
Preferably, the fiber filter is a fiber bundle filter with the diameter of 0.9-3.0 m and the height of 1.5-5.5 m, and the interception capacity of suspended matters larger than 5um is larger than 95%.
Preferably, the activated carbon in the activated carbon filter is coconut shell activated carbon, the iodine value is more than 900, and the methylene blue value is more than 6. More preferably, the iodine value is greater than 1050 and the methylene blue value is greater than 8.
Preferably, the filter pore diameter of the PE sintering filter is 3-10 um. More preferably 5um.
Preferably, the stainless steel sintered filter has a filter pore size of 3-10 um. More preferably 5um.
Preferably, the cation exchanger is filled with strong acid ion exchange resin, the diameter of the cation exchanger is 1-3 m, the height is 2-5 m, and the cation removal rate is more than 99%.
Preferably, the decarbonization tower is a carbon dioxide removal tower with the diameter of 1-3 m and the height of 3-5 m, and the pH value of the effluent is 3-5.
Preferably, the anion exchanger is filled with strong alkaline ion exchange resin, the diameter of the anion exchanger is 1-3 m, the height is 2.5-6.0 m, and the anion removal rate is more than 99%.
Preferably, the pure water storage tank is provided with an on-line pH meter, a conductivity meter and a COD analyzer.
In a second aspect of the present invention, there is provided a process for treating polyvinyl chloride organic wastewater, using the polyvinyl chloride organic wastewater treatment system as described above, comprising the steps of:
the first step: the organic wastewater from the polyvinyl chloride production process sequentially flows through a cooling tower and a biochemical system, the temperature is reduced from about 70 ℃ to about 40 ℃ through cooling and biochemical treatment, and COD is reduced from more than 300mg/L to less than 40mg/L;
and a second step of: the wastewater sequentially passes through a fiber filter, an ozone reactor and an activated carbon filter, the COD is reduced to be less than 10mg/L, and the pH is controlled to be 6-8;
and a third step of: the wastewater sequentially passes through a PE sintering filter, a cation exchanger, a decarbonization tower, an anion exchanger and a stainless steel sintering filter, and the generated pure water is finally stored by a pure water storage tank and is recycled in the polyvinyl chloride production process, wherein COD is less than 3mg/L, conductivity is less than 1us/cm, pH is between 6 and 8, and turbidity is less than 1NTU.
Preferably, the polyvinyl chloride organic wastewater mainly comprises flushing wastewater of a polymerization reaction kettle, condensed water of a stripping tower, centrifugal mother liquor wastewater generated by a centrifugal machine and the like in the polyvinyl chloride production process.
Preferably, the treatment process of the polyvinyl chloride organic wastewater can continuously feed water and continuously discharge water, and the running flow is 50-1000 m 3 /h。
More preferably, in order to ensure long-term stable operation of the system, the invention designs a mobile resin cleaning system outside the system. In general, in order to ensure the surface structure property of the resin, the resin is subjected to external cleaning once in 6-9 months, and the resin cleaning time is 7-9 hours each time.
The invention has the advantages that:
1. the invention provides a complete new process for sewage treatment and reuse and whole flow control, and all the polymerization mother liquor wastewater (polymerization reaction and flushing water, coating kettle wastewater and the like) is reused for production, so that zero emission of production organic wastewater is truly realized in the industry, and PVC production sewage is recycled;
2. by using the system of the invention, the water consumption is saved, in addition, the sewage discharge amount is reduced, and the operation cost is less than 3.5 yuan/m 3 Waste water, the cost is obviously saved;
3. the polyvinyl chloride wastewater treatment system can be operated under the load of 75-110% of design capacity, and the water yield of the system reaches more than 95%;
4. macromolecular pollutants after a biochemical system can be removed through fiber filtration and ozone oxidation;
5. in order to enable the quality of the water produced by the system to be monitored in real time, the invention designs an online pH meter, a conductivity meter and a CODcr analyzer on a pure water storage tank;
6. the system and the method solve the problems of treatment and reutilization of organic wastewater in the existing polyvinyl chloride industry, save water resources, reduce water cost in the polyvinyl chloride industry, effectively realize the purposes of energy conservation, emission reduction and environmental protection, and can be used for treatment and reutilization of organic wastewater in the polyvinyl chloride industry.
Drawings
FIG. 1 is a schematic diagram of a system for treating polyvinyl chloride organic wastewater;
reference numerals and components referred to in the drawings are as follows:
1-cooling tower, 2-biochemical system, 3-fiber filter, 4-ozone reactor, 5-activated carbon filter, 6-PE sintering filter, 7-cation exchanger, 8-decarbonization tower, 9-anion exchanger, 10-stainless steel sintering filter, 11-pure water storage tank, 12-online pH meter, 13-conductivity meter, 14-COD analyzer, 15-blower, 16-oxygenerator, 17-ozone generator.
Detailed Description
The following provides a detailed description of embodiments of the present invention with reference to examples.
Examples
In the Shandong province, the letter issuing chemical industry adopts the polyvinyl chloride organic wastewater treatment system and the technology in the invention to carry out advanced treatment on organic wastewater generated in the polyvinyl chloride production process.
1. Index of polyvinyl chloride organic wastewater
The polyvinyl chloride organic wastewater of the signaling chemical industry mainly comprises flushing wastewater of a polymerization reaction kettle, condensed water of a stripping tower, centrifugal mother liquor wastewater generated by a centrifuge and the like in the polyvinyl chloride production process, and the wastewater amount is 300m 3 And/h. Wherein the temperature of the wastewater is 70 ℃, the COD is 300mg/L, and the conductivity is 200 mu s/cm.
2. Organic wastewater treatment process conditions
The organic wastewater treatment system is schematically shown in fig. 1. The system comprises a cooling tower 1, a biochemical system 2, a fiber filter 3, an ozone reactor 4, an activated carbon filter 5, a PE sintering filter 6, a cation exchanger 7, a decarburization tower 8, an anion exchanger 9, a stainless steel sintering filter 10 and a pure water storage tank 11 which are connected in sequence through pipelines.
The ozone reactor 4 is also provided with an ozone generating system, the ozone generating system comprises a blower 15, an oxygenerator 16 and an ozone generator 17, which are sequentially communicated through pipelines, and the system is two-in-one. The ozone outlet of the ozone generator 17 is connected with the ozone inlet at the bottom of the ozone reactor 4. The capacity of the ozone generator 17 was 20kg/h. The cooling tower 1 is a glass fiber reinforced plastic outdoor cooling tower without packing. The biochemical system 2 comprises an aerobic tank and an anaerobic tank, wherein the concentration range of dissolved oxygen in the aerobic tank is 5-8 mg/L, and the concentration of dissolved oxygen in the anaerobic tank is 0.5-3mg/L. The fiber filter 3 is a fiber bundle filter with the diameter of 0.9-3.0 m and the height of 1.5-5.5 m, and the interception capacity for suspended matters larger than 5um is larger than 95%. The stainless steel sintered filter 10 had a filter pore size of 5um, and the pe sintered filter 6 had a filter pore size of 5um. The activated carbon in the activated carbon filter 5 is coconut activated carbon, the iodine value is more than 1000, and the methylene blue value is more than 8. And the cation exchanger 7 is filled with strong acid ion exchange resin, the diameter of the cation exchanger 7 is 1-3 m, the height is 2-5 m, and the cation removal rate is more than 99%. The decarbonization tower 8 is a carbon dioxide removal tower with the diameter of 1-3 m and the height of 3-5 m, and the pH value of the effluent is 3-5. And the anion exchanger 9 is filled with strong alkaline ion exchange resin, the diameter of the anion exchanger 9 is 1-3 m, the height is 2.5-6.0 m, and the anion removal rate is more than 99%. An on-line pH meter 12, a conductivity meter 13 and a COD analyzer 14 are installed on the pure water storage tank 11.
The treatment process of the polyvinyl chloride organic wastewater comprises the following steps:
the first step: the organic wastewater from the polyvinyl chloride production process is subjected to cooling and biochemical treatment sequentially through a cooling tower 1 and a biochemical system 2.
And a second step of: the wastewater sequentially passes through a fiber filter 3, an ozone reactor 4 and an activated carbon filter 5 to remove macromolecular organic matters generated in the biochemical process.
And a third step of: the wastewater sequentially passes through a PE sintering filter 6, a cation exchanger 7, a decarbonization tower 8, an anion exchanger 9 and a stainless steel sintering filter 10, and pure water is stored in a pure water final storage tank 11 and is reused in the polyvinyl chloride production process.
The treatment process of the polyvinyl chloride organic wastewater can continuously feed water and continuously discharge water, and the running flow is 300m 3 /h。
3. Application results:
the temperature is reduced from 70 ℃ to 40 ℃ through cooling and biochemical treatment, and the COD is reduced from 300mg/L to 35mg/L. The COD is reduced to 9mg/L through the fiber filter 3, the ozone reactor 4 and the activated carbon adsorber 5 in sequence. Then sequentially passing through a PE sintering filter 6, a cation exchanger 7, a decarburization tower 8, an anion exchanger 9 and a stainless steel sintering filter 10, and storing in a pure water final pure water storage tank 11, wherein COD is reduced to 2mg/L, conductivity is reduced to 0.6us/cm, pH is changed to 7.6, and turbidity is less than 0.6NTU.
In conclusion, by adopting the system and the method, most of polyvinyl chloride organic wastewater is recycled, and water resources are saved. The embodiment proves that the system and the process are very suitable for treating polyvinyl chloride organic wastewater, realize the high-efficiency utilization of wastewater reclamation and energy, and have remarkable social benefit and environmental benefit.
While the preferred embodiments of the present invention have been illustrated and described, the present invention is not limited to the embodiments, and various equivalent modifications and substitutions can be made by one skilled in the art without departing from the spirit of the present invention, and these equivalent modifications and substitutions are intended to be included in the scope of the present invention as defined in the appended claims.
Claims (2)
1. The polyvinyl chloride organic wastewater treatment system is characterized by comprising a cooling tower, a biochemical system, a fiber filter, an ozone reactor, an activated carbon filter, a PE sintering filter, a cation exchanger, a decarburization tower, an anion exchanger, a stainless steel sintering filter and a pure water storage tank which are connected in sequence through pipelines; the cooling tower is a glass fiber reinforced plastic outdoor cooling tower without filler; the biochemical system comprises an aerobic tank and an anaerobic tank, wherein the concentration range of dissolved oxygen in the aerobic tank is 5-8 mg/L, and the concentration of dissolved oxygen in the anaerobic tank is 0.5-3mg/L; the fiber filter is a fiber bundle filter, the diameter is 0.9-3.0 m, the height is 1.5-5.5 m, and the interception capacity for suspended matters larger than 5um is more than 95%; the ozone reactor is also provided with an ozone generating system, the ozone generating system comprises a blower, an oxygenerator and an ozone generator, which are sequentially communicated through a pipeline, and an ozone outlet of the ozone generator is connected with an ozone inlet at the bottom of the ozone reactor; the capacity of the ozone generator is 5-20 kg/h; the activated carbon in the activated carbon filter is coconut activated carbon, the iodine value is greater than 1050, and the methylene blue value is greater than 8; the filtering pore diameter of the PE sintering filter is 5um; the filtering aperture of the stainless steel sintered filter is 5um; the cation exchanger is filled with strong acid ion exchange resin, the diameter of the cation exchanger is 1-3 m, the height is 2-5 m, and the cation removal rate is more than 99%; the anion exchanger is filled with strong alkaline ion exchange resin, the diameter of the anion exchanger is 1-3 m, the height is 2.5-6.0 m, and the anion removal rate is more than 99%; the decarbonization tower is a carbon dioxide removal tower with the diameter of 1-3 m and the height of 3-5 m, and the pH value of the effluent is 3-5; an online pH meter, a conductivity meter and a COD analyzer are arranged on the pure water storage tank; the polyvinyl chloride organic wastewater comprises flushing wastewater of a polymerization reaction kettle, condensed water of a stripping tower and centrifugal mother liquor wastewater generated by a centrifugal machine in the polyvinyl chloride production process.
2. A process for treating polyvinyl chloride organic wastewater, which is characterized in that the treatment system of the polyvinyl chloride organic wastewater is adopted, and the process for treating the polyvinyl chloride organic wastewater comprises the following steps:
the first step: the organic wastewater from the polyvinyl chloride production process sequentially flows through a cooling tower and a biochemical system, the temperature is reduced from 70 ℃ to 40 ℃ and the COD is reduced from more than 300mg/L to less than 40mg/L through cooling and biochemical treatment;
and a second step of: the wastewater sequentially passes through a fiber filter, an ozone reactor and an activated carbon filter, the COD is reduced to be less than 10mg/L, and the pH is controlled to be 6-8;
and a third step of: the wastewater sequentially passes through a PE sintering filter, a cation exchanger, a decarbonization tower, an anion exchanger and a stainless steel sintering filter, and the generated pure water is finally stored by a pure water storage tank and is recycled in the polyvinyl chloride production process, wherein COD is less than 3mg/L, conductivity is less than 1us/cm, pH is between 6 and 8, and turbidity is less than 1NTU.
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