Integrated biotreatment system and method for PVC (poly vinyl chloride) industrial wastewater

Abstract

The invention discloses an integrated biotreatment system and a method for PVC (poly vinyl chloride) industrial wastewater. The system comprises an air floatation sedimentation unit, a hydrolysis acidification unit, a contact oxidation unit and an advanced treatment unit which are connected sequentially, wherein the air floatation sedimentation unit comprises an air floatation sedimentation pool, the inlet end of the air floatation sedimentation pool is connected with a wastewater pipeline, the hydrolysis acidification unit is a hydrolysis acidification pool, the contact oxidation unit comprises a first grade contact oxidation pool a second grade contact oxidation pool which are in serial connection, the advanced treatment unit comprises a composite membrane bioreactor I connected with the second grade contact pool, and the composite membrane bioreactor I is connected with a clean water basin.

Description

technical field [0001] The invention relates to a comprehensive biological treatment system, in particular to a comprehensive biological treatment system and method for PVC production waste water. The invention belongs to the technical field of waste water treatment. Background technique [0002] The main source of wastewater in the PVC production process of the suspension method is deionized water. After the polymerization reaction is completed, the mother liquor wastewater discharged from the centrifugal separation process, the washing water of the polymerization kettle, the filter washing water and the washing water of the dry tail cooling, the PVC mother liquor wastewater is A kind of process wastewater with high recycling value after treatment. [0003] However, the main pollutants in wastewater are fine particles of PVC, and a small amount of VCM monomer and residual additives. Additives (PVA) in wastewater are the main source of COD. The characteristics of the centr...

AI Technical Summary

Problems solved by technology

[0005] (2) High turbidity

[0007] (4) The organic matter in wastewater is a macromolecular organic matter, which is difficult to biodegrade;

[0010] There are many problems in wastewater treatment, it is difficult to effectively treat and utilize

The traditional treatment facilities for the polymerization centrifuge mother liquor wastewater of the existing PVC production plant are easy to attach a large amount of sludge and green algae to the filler of the contact oxidation tank, the microbial activity is poor, and the COD decomposition efficiency is reduced

Images