Bioreactor using polyvinyl alcohol nano microsphere dynamic film as filtration medium

Abstract

The invention discloses a filter dielectric biological reactor in the effluent processing and water recycling technical domain, which is characterized by the following: adopting industrial filter cloth as porous bottom film; emulsifying and crosslinking polyvinyl alcohol and glutaraldehyde to obtain the microball as precoating agent; depositing microball on the outer wall and pore wall; forming polyvinyl alcohol nanometer microball dynamic film; fixing the film component on the frame; placing in the biological reactor; discharging water through sucking pump.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, relates to sewage treatment and reclaimed water reuse technology, and in particular to a method for reducing the process cost of a membrane bioreactor and delaying membrane fouling. Background technique [0002] my country is one of the 13 water-poor countries in the world. More than 400 of the more than 600 cities are short of water. The industrial output value reduced by water shortage exceeds 120 billion yuan per year. Using reclaimed water with lower water quality and price than drinking water for greening, washing cars, and flushing sanitary appliances can save precious water resources, ease the contradiction between supply and demand of urban water, and reduce the burden on urban drainage systems. Membrane bioreactor (membrane bioreactorMBR) is considered to be one of the most promising sewage treatment and reuse technologies. It can replace the three processes of activate...

AI Technical Summary

Problems solved by technology

The results show that the total COD removal rate of the system is basically greater than 80%. However, the surface of the dynamic membrane is seriously polluted, and the lower aeration to avoid excessive operating pressure will completely destroy the dynamic membrane, and the average effluent SS reaches 2270mg / l. The dynamic membrane will be re-formed after 35 minutes. Therefore, it is necessary to add a device to return the effluent for a period of time after aeration below. There are still problems in the quality of effluent water and the stability of system operation, and there is still a gap from practical application.

Dalian University of Technology experimented with powdered activated carbon as a precoating agent to form a dynamic film on the surface of the membrane to prevent irreversible contamination of the basement membrane by pollutants. However, due to the instability of the precoating formed by powdered activated carbon, the partial peeling of the coating will cause local contamination of the basement membrane. ; In addition, the hydrophobicity of powdered activated carbon itself and the adsorption of pollutants cause pollutants to form a filter cake layer outside the dynamic membrane; therefore, although this technology can delay the occurrence of membrane fouling, the effect is still not ideal

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