A mbr membrane bioreactor

Abstract

The inventio provides an MBR membrane bioreactor for sewage treatment. The MBR membrane bioreactor comprises: an MBR membrane biological reaction tank, in which an MBR biological membrane assembly isarranged; a first separation net, which is arranged above the MBR biological membrane assembly; a second separation net, which is arranged below the MBR biological membrane assembly; an aeration bottom pipe, which is arranged at the bottom of the MBR membrane biological reaction tank; a scouring filler, which can scour an MBR biological membrane; a third separation net, which is arranged at the middle upper part of the MBR biological membrane assembly, wherein a first space is formed between the third separation net and the first separation net, and a second space is formed between the third separation net and the second separation net; and a central aeration pipe, which is arranged at the lower part of the first space, wherein one part of the scouring filler is located in the first space,and the other part of the scouring filler is located in the second space.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system of an MBR membrane bioreactor. Background technique [0002] Membrane bioreactor (MBR) is a new sewage treatment process that combines membrane separation technology and bioreactor. MBR is mainly composed of membrane module and bioreactor. The bioreactor is to degrade pollutants, and the membrane module is used to filter and further purify water quality. MBR combines membrane separation and biodegradation, and replaces the secondary settling tank in ordinary bioreactors with membrane separation devices, which greatly improves the solid-liquid separation capacity of the system, thereby greatly improving the system's effluent water quality and volume load. [0003] However, in engineering applications, high energy consumption and high cost are still two bottlenecks hindering the development of MBR technology. Among them, membrane fouling is one ...

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Problems solved by technology

However, on the one hand, the volume of the filler in the reactor needs to occupy more than 20% of the effective volume, which correspondingly leads to a decrease in the sewage flow per unit time in the MBR membrane reactor and affects the sewage treatment efficiency; on the other hand, for the upper part of the membrane module , because the air is difficult to blow, it will affect the cleaning effect of the filler on the membrane surface, resulting in the accumulation of pollutants on the membrane surface, and the rapid rise of the pressure difference will cause the membrane to clog and affect the purification effect of the membrane.

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