Control method for membrane fouling and sludge yield of membrane bioreactor

Abstract

The invention relates to a control method for the membrane fouling and sludge yield of a membrane bioreactor (MBR). The control method comprises the following steps: 1) a multifunctional composite bactericide is prepared by one or more of substances including bdellovibrio bacteriovorus, myxococcus flavus, saccharomycetes, bacillus and actinomycetes; and 2) the multifunctional composite bactericideis put into an aerobic membrane bioreactor by flowing directly or after in-situ activation according to water quantity, water quality and system temperature. By adding the multifunctional composite bactericide which has the characteristics of being able to hunt organisms, strong in secretion of extracellular hydrolytic enzymes, and the like into the membrane bioreactor, the invention has the advantages that the cell walls of the microorganisms are cracked and the structure of sludge is destroyed; the formation of a biofilm on the membrane bioreactor is restrained; the contents of extracellular polymeric substances (EPS) and soluble microbial products (SMP) in sludge mixture are reduced; the sludge and water are promoted to be degraded at the same time; the membrane fouling of the MBR is effectively reduced; the sludge yield of the system is controlled; the effect that the concentration of the sludge in the reactor is stabilized is achieved; the pressure in treating waste water and thesludge is reduced; and the quality of the treated water is not influenced.

Description

technical field [0001] The invention relates to a control method, in particular to a method for controlling membrane pollution and sludge yield of a membrane bioreactor, and belongs to the technical field of sludge treatment by biotechnology. Background technique [0002] In recent years, membrane bioreactor (MBR), as an innovative and promising wastewater treatment process, has attracted increasing attention. It combines the physical separation of membranes with the biodegradation of activated sludge, and replaces the secondary settling tank in traditional activated sludge reactors with membrane separation devices to achieve efficient solid-liquid separation. Compared with the traditional wastewater biological treatment process, it has many advantages, including: good effluent quality, small footprint, etc. However, the membrane fouling problem generated during the operation of MBR will cost a lot of money, which greatly restricts its promotion. [0003] Membrane fouling ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the technical problems existing in the prior art and provides a membrane bioreactor membrane fouling and sludge yield control method. The technical problem to be solved is to provide a membrane bioreactor membrane fouling mitigation and sludge yield control method. Yield control biotechnology, comprehensively using the principles of microbial lysis, EPS and SMP degradation, and inhibition of biofilm formation structure, to achieve simultaneous degradation of mud and water, reduce gel layer formation, alleviate membrane fouling and control system sludge yield, to achieve a stable reactor The effect of internal sludge concentration, reducing the cost of sewage and sludge treatment, no secondary pollution and health and safety issues

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