PVC (polyvinyl chloride) centrifugal mother liquor wastewater recycling process utilizing tubular membrane filter

A centrifuge mother liquor and filter technology, applied in the direction of water pollutants, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of long time consumption, high construction cost and operation cost, large amount of waste water, etc., and achieve reduction Concentrated water discharge, stable treatment effect, and the effect of reducing source water turbidity

Inactive Publication Date: 2012-03-14
广州新普利节能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing treatment methods of PVC centrifuge mother liquor wastewater, such as the treatment methods disclosed in Chinese patents CN101391852 and CN101462815, the step of biological bacteria degrading organic matter in mother liquor wastewater is used, and the process is complex and time-consuming
Due to the large amount of waste water, large floor area, high construction and operating costs, it is not conducive to the wide application of industrial production

Method used

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  • PVC (polyvinyl chloride) centrifugal mother liquor wastewater recycling process utilizing tubular membrane filter
  • PVC (polyvinyl chloride) centrifugal mother liquor wastewater recycling process utilizing tubular membrane filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The mass concentration of suspended solids (SS) in the PVC centrifuge mother liquor wastewater produced in the production process of PVC (polyvinyl chloride) is 30-400 mg / L, mainly PVC particles. At the same time, the temperature is high, generally around 60-70°C. After being collected into the mother liquor collection tank, large PVC particles settle to the bottom of the pond to form sediment. The sediment is treated by a pump dehydrator, PVC is recycled, and the filtrate is returned to the mother liquor for collection. pool; the clear liquid is pumped into the spray separation tower for preliminary degassing and cooling, and then flows into the inclined plate settling tank for sedimentation treatment. Dosing chemicals in the inclined plate settling tank, further recovering finer PVC particles, and removing the dispersant, Substances such as initiators and terminators that will pollute the membrane, after the mother liquid wastewater settles in the inclined plate settli...

Embodiment 2

[0046] Including the conditions and treatment process in Example 1, the difference is that in the reverse osmosis pretreatment, the mother liquid wastewater is sent to the plate heat exchanger through the intermediate water pump to cool down, and then directly enters the tubular membrane filter for treatment, and then enters the Intermediate tank and subsequent reverse osmosis system. Reduced access to multi-media filters and activated carbon filters.

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Abstract

The invention relates to a wastewater treatment process, and in particular relates to a PVC (polyvinyl chloride) centrifugal mother liquor wastewater recycling process. The recycling process comprises the steps of mother liquor collection, spraying centrifugation treatment, sedimentation treatment, heat exchange treatment, reverse osmosis pretreatment, reverse osmosis treatment, mixed bed treatment and the like. The PVC centrifugal mother liquor wastewater is treated by adopting the process provided by the invention, thus the recycling and cyclic utilization of the PVC centrifugal mother liquor wastewater are realized, the utilization rate of product water reaches 75%, reverse osmosis product water can be reused for boiler makeup water or circulating cooling water supplementation; and mixed bed product water can be reused as water for a PVC polymerization process. By the process provided by the invention, the water amount of concentrated water (wastewater) needing to be treated and discharged is greatly reduced, production cost is reduced, and benefits are created for a PVC production enterprise.

Description

[0001] technical field [0002] The invention relates to a waste water treatment process, in particular to a polyvinyl chloride (PVC) centrifugal mother liquid waste water reuse process with a tubular membrane filter. [0003] Background technique [0004] The main impurities in PVC centrifuge mother liquor are dispersants, defoamers, initiators, terminators, fine PVC particles, VCM monomers, etc. used in the polymerization process. The characteristics of its water quality are: low ion content; high temperature, generally at 60-70°C; low hardness and chlorine radicals; large water volume, 3-5 t of deionized water is required to produce 1 ton of PVC; high turbidity, suspended solids (SS) mass concentration is 100-400 mg / L, mainly PVC particles; organic matter concentration is low, 100-500 mg / L, a large amount of organic matter contained is extremely difficult to degrade and difficult to handle. In the existing treatment methods of PVC centrifugal mother liquor wastewater, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/44C02F1/52C02F101/36
Inventor 莫新来谭子斌陈胜利莫明光
Owner 广州新普利节能环保科技有限公司
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