Novel process for treating ABS wastewater

Abstract

The invention relates to the field of sewage treatment, and particularly relates to a technology for ABS high difficult chemical wastewater. According to the technology, a combined process of 'coagulating sedimentation + parallel-serial biological enhancement processing system + dynamic membrane bioreactor' is adopted to treat ABS production wastewater. A conventional coagulant is added into a coagulation sedimentation tank to mainly remove suspended matters, colloid particles and phosphor from intaken water. The parallel-serial biological enhancement processing system is developed from a conventional A2O process. In the system, an aerobic tank and an anaerobic tank are connected in parallel and then connected with an anoxic tank in series; the aerobic tank is provided with an independent sludge return-flow system; the anaerobic tank and the anoxic tank share another sludge return-flow system for denitrifying phosphorus removal. A cheap porous medium is employed as a support filter base material by the dynamic membrane bioreactor; both powder activated carbon and activated sludge are added in the reactor; and deep treatment of the wastewater is realized by forming a cake layer through suction filtration. The process is novel in technology and has the advantages of simple process flow, high processing efficiency and low operation cost.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a technique for jointly treating ABS difficult chemical wastewater by a physical-chemical method and a biological method. Background technique [0002] ABS production wastewater contains acrylonitrile, butadiene, styrene and various additives. It has the characteristics of high COD, high toxicity, high nitrogen and phosphorus content, and poor biodegradability. It is a refractory organic petrochemical wastewater. The reported chemical treatment methods for ABS production wastewater include Fenton oxidation, photocatalysis, ozone oxidation, flocculation precipitation, and electrolysis; physical methods include activated carbon adsorption, air flotation, etc.; biological treatment methods include: A / O, multi-stage A / O, biological aerated filter and other processes. It is difficult to achieve standard treatment of complex ABS production wastewater by a single treatment technology, ...

AI Technical Summary

Problems solved by technology

It is difficult to achieve standard treatment of complex ABS production wastewater by a single treatment technology, and a combination of physical, chemical and biochemical methods is generally used for treatment

However, the existing combination process has problems such as redundant process, long process flow, and environmental pollution caused by excessive chemical dosage. It is necessary to develop a new and efficient treatment process for technological innovation.

[0003] In addition, existing research reports and engineering practices focus on the removal of organic matter and suspended solids in wastewater, while ignoring the removal of relatively high concentrations of nitrogen and phosphorus in wastewater.

As the country pays more and more attention to environmental protection, the comprehensive sewage discharge standards are becoming more and more stringent. The existing treatment process cannot meet the high standard nitrogen and phosphorus treatment requirements. Therefore, it is necessary to develop new technologies to improve the system's treatment efficiency for nitrogen and phosphorus.

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