Method for directly treating high temperature and high turbidity PVC mother liquor by using biologic filter

Abstract

The process of treating high temperature high turbidity PVC mother liquid directly in biofilter includes the following steps: pumping the PVC mother liquid with high temperature, high turbidity and high organic matter content into natural deposition tank for staying at 70-80 for 4 hr; pumping into hydrolysis tank with stuffing and hydrolysis colony; nitrifying and denitrifying in aerobic biofilter; processing in air floating-flocculating system; fine filtering in fine filtering system; and further processing and returning to PVC production. The process is simple, and needs no cooling, no dilution and neutralization, and the biological colony can degrade high concentration PVC particle and PVA as well as other organic matter inside the mother liquid. The process has low running cost and less investment, and the biological stuffing is biological carbon balls with high adsorption and less jamming.

Description

technical field [0001] The invention relates to a method for treating industrial wastewater, in particular to a method for directly treating the high-temperature and high-turbidity PVC mother liquor water produced in the production process of polyvinyl chloride (PVC) by the suspension method, through an aerated biological filter tank. recycle. Background technique [0002] The production process of polyvinyl chloride by suspension method is to use vinyl chloride monomer (VCM) as the raw material (including acetylene→vinyl chloride), and add various chemicals into the polymerization reactor. After polymerization, VCM gradually polymerizes into fine polyvinyl chloride Granules, what is used in the production process is "deionized water" (the content of the main ions in the water is: Cl - 29mg / L, Mg ++ 0.4mg / L, turbidity <1, Ca ++ Not detected, PH~7 water), does not participate in the reaction, is just a reaction medium, and is discharged when it reaches a certain level. ...

AI Technical Summary

Problems solved by technology

[0003] At present, there is no method to directly treat the high-temperature mother liquid water with a turbidity as high as about 100 degrees with a biological aerated filter

Especially the direct (no dilution, no neutralization, no cooling) biochemical degradation and recycling technology of high temperature mother liquid water in polyvinyl chloride workshop with acetylene as the main raw material has not been found so far.

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