Novel polyvinyl chloride (PVC) mother solution treatment equipment and method

Abstract

The invention discloses novel polyvinyl chloride (PVC) mother solution treatment method. The PVC mother solution is passed through a primary cooling and a secondary cooling to an anaerobic pool and an aerobiotic pool to apply biochemical treatment, then the product is put into a coagulating sedimentation pool to settle the sludge, at last, the product is filtered by submerged ultrafiltration, so as to produce the qualified water. The novel PVC mother solution treatment equipment has a good water treatment effect and high operating stability, can be used for effectively treating the PVC mother solution for a long time, and is relatively low in operating cost and high in quality of output water.

Description

technical field [0001] The invention belongs to the technical field of advanced treatment of PVC mother liquid water, and in particular relates to a PVC mother liquid water treatment method. Background technique [0002] Although the organic concentration of PVC centrifugal mother liquid wastewater is low, most of them are toxic or difficult to biodegrade. When discharged into the water body, they will accumulate in a large amount in the environment, increasing the viscosity of the water body, affecting the activities of microorganisms, and affecting the sensory properties and properties of the water body. The natural restoration of the water body is extremely unfavorable. Therefore, if the PVC mother liquor wastewater is not treated, it will accumulate for a long time, and the harm to the environment is no less than that of high-concentration chemical wastewater. Therefore, the treatment of PVC centrifuge mother liquor wastewater is very important. [0003] At present, the...

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Problems solved by technology

[0003] At present, the main methods related to the treatment of PVC centrifugal mother liquor are: 1. coagulation method, which can remove a small amount of PVC suspended particles in PVC mother liquor wastewater, but the removal rate of soluble COD is very low, and the COD in PVC mother liquor wastewater can only From 200mg / L to 170mg / L

2. Biochemical method, when using conventional biological treatment process, the growth rate of PVA degrading bacteria is low. It is easy to be washed out in the traditional activated sludge treatment, which makes the treatment of PVC centrifuge mother liquor wastewater more difficult

3. Ultrafiltration membrane method. When the ultrafiltration membrane with a pore size of 1.5um is directly used for ultrafiltration treatment of the mother liquor wastewater, the effect is better in the initial stage of operation. After ultrafiltration, the COD in the PVC mother liquor wastewater is reduced from about 200mg / L. To below 20mg / L, it reached the standard of reuse water, but after a period of time, the concentration of pollutants in the system was too high, PVA colloid blocked the ultrafiltration pores, and the filter membrane could not be backwashed and regenerated, which eventually led to failure

4. Coagulation-ozone method, which has a good removal effect on COD, but after being put into production practice, the treatment effect is very unstable. It is difficult to operate productively. Since PVA is a hydrophilic non-ionic polymer, Flocculants such as aluminum salts and iron salts have little effect on it, and the COD in the mother liquor wastewater after coagulation is still high, and the burden on the subsequent ozone unit is too heavy, and the cost of the ozone unit is too high, making it difficult to produce and apply

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