CN111196645A - Centrifugal mother liquor water recycling system and method thereof - Google Patents
Centrifugal mother liquor water recycling system and method thereof Download PDFInfo
- Publication number
- CN111196645A CN111196645A CN201910948052.4A CN201910948052A CN111196645A CN 111196645 A CN111196645 A CN 111196645A CN 201910948052 A CN201910948052 A CN 201910948052A CN 111196645 A CN111196645 A CN 111196645A
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- Prior art keywords
- mother liquor
- tank
- centrifugal
- slurry
- recycling
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Classifications
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- 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
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- 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
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- 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
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses a centrifugal mother liquor water recycling system, which comprises a mother liquor recovery tank, a mother liquor centrifugal settling tank, a slurry filter, a circulating cooler, an organic photocatalytic oxidation tank, a secondary settling tank and a recycling tank, wherein the mother liquor recovery tank is connected with the mother liquor centrifugal settling tank; the mother liquor recovery tank is communicated and connected with a mother liquor centrifugal settling tank, and the supernatant of the mother liquor centrifugal settling tank is connected with a slurry filter; a filtrate outlet of the slurry filter is provided with a circulating cooler; the filtrate outlet is connected with an organic photocatalytic oxidation tank, the organic photocatalytic oxidation tank is connected with a secondary sedimentation tank, and a supernatant outlet of the secondary sedimentation tank is connected with a recycling tank. The invention discloses a centrifugal mother liquor water recycling system, which effectively recycles centrifugal mother liquor, solves the problem of resource shortage of enterprises, can recycle heat energy, eliminates pollution and increases economic benefits.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a centrifugal mother liquor water recycling system.
Background
At present, the production method of polyvinyl chloride (PVC) in China mainly comprises an ethylene oxychlorination method and a calcium carbide acetylene method. Because China has unique resources of coal and limestone, the supply of calcium carbide raw materials is guaranteed; in addition, after the development and improvement of calcium carbide acetylene method PVC in recent years, the process technology is mature, and the technical support is provided for the development of calcium carbide acetylene method PVC resin. However, for a long time, a large amount of carbide slag and waste water generated by PVC (polyvinyl chloride) by a carbide acetylene method are already used for producing cement, and most of the waste water is not utilized. With the continuous improvement of the suspension method for producing PVC resin, the addition amount of vinyl chloride monomer is gradually increased, the water consumption is gradually increased, but 60-70% of water still does not participate in the reaction, and the water is only used for removing heat released in the reaction process and carrying a dispersing agent so as to be convenient for conveying and stirring. After the PVC polymerization reaction, 70% of water in the slurry is separated out, and the slurry is called centrifugal mother liquor.
The PVC centrifugal mother liquor has the following 5 characteristics
(1) The water quantity is large; (2) the water temperature is higher, generally 40-70 ℃; (3) the turbidity is high, the concentration of suspended matters contained in the centrifugal mother liquor is generally 20-30 mg/L; (4) the organic matter concentration is low, but is difficult to degrade, and has certain toxicity, and COD is 200-500 mg/L, and belongs to chemical wastewater with medium and low concentration; (5) the ion content is low.
The centrifugal mother liquor has high content of Suspended Substances (SS) and VCM, and if the centrifugal mother liquor is directly discharged, water resources are wasted, and the environment is seriously polluted; and the overflow of a large amount of VCM forms potential safety hazard in the discharged water, thereby bringing serious threat to a wastewater treatment system. Therefore, the practical situation of the production is combined, the centrifugal mother liquor is reasonably utilized, the problem of water resource shortage of enterprises can be solved, heat energy can be recovered, pollution is eliminated, and economic benefit can be increased.
Disclosure of Invention
In order to solve the problems, the invention discloses a centrifugal mother liquor water recycling system which can effectively recycle centrifugal mother liquor, solve the problem of resource shortage of enterprises, recycle heat energy, eliminate pollution and increase economic benefits.
In order to achieve the above purpose, the invention provides the following technical scheme:
a centrifugal mother liquor water recycling system comprises a mother liquor recovery tank, a mother liquor centrifugal settling tank, a slurry filter, a circulating cooler, an organic photocatalytic oxidation tank, a secondary settling tank and a recycling tank; the mother liquor recovery tank is communicated and connected with a mother liquor centrifugal settling tank, and the supernatant of the mother liquor centrifugal settling tank is connected with a slurry filter; a filtrate outlet of the slurry filter is provided with a circulating cooler; the filtrate outlet is connected with an organic photocatalytic oxidation tank, the organic photocatalytic oxidation tank is connected with a secondary sedimentation tank, and a supernatant outlet of the secondary sedimentation tank is connected with a recycling tank.
Further, the mother liquor recovery tank is connected with a PVC polymerization kettle through a slurry centrifugal system; the slurry centrifugal system comprises a slurry delivery pump, a centrifugal machine and a mother liquor delivery pump, wherein one end of the slurry delivery pump is connected with the PVC polymeric kettle, the other end of the slurry delivery pump is connected with the centrifugal machine, and a mother liquor outlet of the centrifugal machine is connected with a mother liquor recovery tank through the mother liquor delivery pump.
Further, the mother liquor recovery tank is connected with a reverse cleaning system, the reverse cleaning system comprises a cleaning tank, a cleaning pipeline and a spray head, the spray head is connected with the cleaning tank through the cleaning pipeline, and the spray head is located in the mother liquor recovery tank. The spraying cleaning of the mother liquor recovery tank is realized.
Furthermore, a temperature and Ph detector is arranged in the recycling tank.
Further, the slurry filter is connected with a back washing system. The back cleaning system simultaneously cleans the slurry filter to avoid filter blockage.
The invention also discloses a treatment method of the centrifugal mother liquor system, which comprises the following steps:
1. the mother liquor in the slurry enters a mother liquor recovery tank from the PVC polymerization kettle;
2. the mother liquor enters a mother liquor centrifugal settling tank for settling, and supernatant after settling enters a slurry filter for filtering; collecting and discharging sediments;
3. filtering the supernatant in a slurry filter, and cooling the filtered filtrate below room temperature by a circulating cooler;
4. thirdly, the cooled filtrate enters an organic photocatalytic oxidation tank for catalytic oxidation treatment to treat organic matters; the catalyzed filtrate enters a secondary sedimentation tank;
5. after the secondary sedimentation treatment, the supernatant in the secondary sedimentation tank returns to the recycling tank; and (4) recycling.
The invention has the following beneficial effects: the centrifugal mother liquor is effectively recycled, the problem of shortage of enterprise resources is solved, heat energy can be recycled, pollution is eliminated, and economic benefits are increased.
Detailed Description
The present invention will be further illustrated below with reference to specific embodiments, which are to be understood as merely illustrative and not limitative of the scope of the present invention.
Example 1
A centrifugal mother liquor water recycling system comprises a mother liquor recycling tank, a mother liquor centrifugal settling tank, a slurry filter, a circulating cooler, an organic photocatalytic oxidation tank, a secondary settling tank and a recycling tank; the mother liquor recovery tank is communicated and connected with a mother liquor centrifugal settling tank, and the supernatant of the mother liquor centrifugal settling tank is connected with a slurry filter; a filtrate outlet of the slurry filter is provided with a circulating cooler; the filtrate outlet is connected with an organic photocatalytic oxidation tank, the organic photocatalytic oxidation tank is connected with a secondary sedimentation tank, and the supernatant outlet of the secondary sedimentation tank is connected with a recycling tank.
The mother liquor recovery tank is connected with the PVC polymerization kettle through a slurry centrifugal system; the slurry centrifugal system comprises a slurry delivery pump, a centrifugal machine and a mother liquor delivery pump, wherein one end of the slurry delivery pump is connected with the PVC polymeric kettle, the other end of the slurry delivery pump is connected with the centrifugal machine, and a mother liquor outlet of the centrifugal machine is connected with a mother liquor recovery tank through the mother liquor delivery pump.
The mother liquor recovery tank is connected with the reverse cleaning system, the reverse cleaning system comprises a cleaning tank, a cleaning pipeline and a spray head, the spray head is connected with the cleaning tank through the cleaning pipeline, and the spray head is positioned in the mother liquor recovery tank. The spraying cleaning of the mother liquor recovery tank is realized.
And a temperature and Ph detector is arranged in the recycling tank.
The slurry filter is connected with the back washing system. The back cleaning system simultaneously cleans the slurry filter to avoid filter blockage.
Example 2
A method of treating a centrifugal mother liquor water reuse system, the method comprising the steps of:
1. the mother liquor in the slurry enters a mother liquor recovery tank from the PVC polymerization kettle;
2. the mother liquor enters a mother liquor centrifugal settling tank for settling, and supernatant after settling enters a slurry filter for filtering; collecting and discharging sediments;
3. filtering the supernatant in a slurry filter, and cooling the filtered filtrate below room temperature by a circulating cooler;
4. thirdly, the cooled filtrate enters an organic photocatalytic oxidation tank for catalytic oxidation treatment to treat organic matters; the catalyzed filtrate enters a secondary sedimentation tank;
5. after the secondary sedimentation treatment, the supernatant in the secondary sedimentation tank returns to the recycling tank; and (4) recycling.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (6)
1. The utility model provides a centrifugation mother liquor water recycling system which characterized in that: the system comprises a mother liquor recovery tank, a mother liquor centrifugal settling tank, a slurry filter, a circulating cooler, an organic photocatalytic oxidation tank, a secondary settling tank and a recycling tank; the mother liquor recovery tank is communicated and connected with a mother liquor centrifugal settling tank, and the supernatant of the mother liquor centrifugal settling tank is connected with a slurry filter; a filtrate outlet of the slurry filter is provided with a circulating cooler; the filtrate outlet is connected with an organic photocatalytic oxidation tank, the organic photocatalytic oxidation tank is connected with a secondary sedimentation tank, and a supernatant outlet of the secondary sedimentation tank is connected with a recycling tank.
2. The recycling system of centrifugal mother liquor as claimed in claim 1, wherein: the mother liquor recovery tank is connected with a PVC polymerization kettle through a slurry centrifugal system; the slurry centrifugal system comprises a slurry delivery pump, a centrifugal machine and a mother liquor delivery pump, wherein one end of the slurry delivery pump is connected with the PVC polymeric kettle, the other end of the slurry delivery pump is connected with the centrifugal machine, and a mother liquor outlet of the centrifugal machine is connected with a mother liquor recovery tank through the mother liquor delivery pump.
3. The recycling system of centrifugal mother liquor as claimed in claim 1, wherein: the mother liquor recovery tank is connected with a reverse cleaning system, the reverse cleaning system comprises a cleaning tank, a cleaning pipeline and a spray head, the spray head is connected with the cleaning tank through the cleaning pipeline, and the spray head is positioned in the mother liquor recovery tank.
4. The recycling system of centrifugal mother liquor as claimed in claim 3, wherein: the slurry filter is connected with a back washing system.
5. The recycling system of centrifugal mother liquor as claimed in claim 1, wherein: and a temperature and Ph detector is arranged in the recycling tank.
6. A treatment method of a centrifugal mother liquor system is characterized by comprising the following steps: the method comprises the following steps:
1) the mother liquor in the slurry enters a mother liquor recovery tank from the PVC polymerization kettle;
2) the mother liquor enters a mother liquor centrifugal settling tank for settling, and supernatant after settling enters a slurry filter for filtering; collecting and discharging sediments;
3) filtering the supernatant in a slurry filter, and cooling the filtered filtrate below room temperature by a circulating cooler;
4) thirdly, the cooled filtrate enters an organic photocatalytic oxidation tank for catalytic oxidation treatment to treat organic matters; the catalyzed filtrate enters a secondary sedimentation tank;
5) after the secondary sedimentation treatment, the supernatant in the secondary sedimentation tank returns to the recycling tank; and (4) recycling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910948052.4A CN111196645A (en) | 2019-10-08 | 2019-10-08 | Centrifugal mother liquor water recycling system and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910948052.4A CN111196645A (en) | 2019-10-08 | 2019-10-08 | Centrifugal mother liquor water recycling system and method thereof |
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| CN111196645A true CN111196645A (en) | 2020-05-26 |
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| CN201910948052.4A Pending CN111196645A (en) | 2019-10-08 | 2019-10-08 | Centrifugal mother liquor water recycling system and method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101333051A (en) * | 2007-11-16 | 2008-12-31 | 北京中科国益环保工程有限公司 | Process for treating and recovering polyvinyl chloride centrifugation mother liquid by suspension method |
| CN101525198A (en) * | 2009-04-03 | 2009-09-09 | 寿光新龙电化集团聚氯乙烯有限公司 | Method for treating and recovering polyvinyl chloride mother liquid waste water |
| CN102775011A (en) * | 2012-07-20 | 2012-11-14 | 山东国瑞环保产业有限公司 | Treating and recycling method for PVC mother liquor wastewater |
-
2019
- 2019-10-08 CN CN201910948052.4A patent/CN111196645A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101333051A (en) * | 2007-11-16 | 2008-12-31 | 北京中科国益环保工程有限公司 | Process for treating and recovering polyvinyl chloride centrifugation mother liquid by suspension method |
| CN101525198A (en) * | 2009-04-03 | 2009-09-09 | 寿光新龙电化集团聚氯乙烯有限公司 | Method for treating and recovering polyvinyl chloride mother liquid waste water |
| CN102775011A (en) * | 2012-07-20 | 2012-11-14 | 山东国瑞环保产业有限公司 | Treating and recycling method for PVC mother liquor wastewater |
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Application publication date: 20200526 |