Composite membrane bioreactor for improving particle size distribution of activated sludge and microenvironment

Abstract

A composite membrane bioreactor for improving particle size distribution of activated sludge and a microenvironment comprises an aeration tank connected with a water inlet pipe and a membrane tank connected with a water outlet pipe, wherein the aeration tank is separated from the membrane tank by a partition plate with water distribution round holes, a suspended carrier which cannot pass through the water distribution round holes is arranged in the aeration tank, a membrane component is arranged in the membrane tank, the bottoms of both the aeration tank and the membrane tank are provided with aeration heads to form a bioreactor having microbes growing in both suspension and attachment manners, so that the biomass is substantially increased, the suspended activated sludge and the rich biophase as well as the oxygen deficit or anaerobic microenvironment in the suspended carrier provide good conditions for nitrogen and phosphorus removal, the suspended carrier and a bio-membrane on the surface of the suspended carrier also become attachment carriers for the particulate matters in the suspended activated sludge, meanwhile, the particle size distribution of the activated sludge is improved and the resistance of a membrane surface cake layer is reduced by feeding a filler and regulating the flow state through the aeration tank, a mixed solution can flow into the membrane tank from the aeration tank through the partition plate, and the suspended carrier is blocked in the aeration tank to avoid frictional damage to the membrane component.

Description

technical field [0001] The invention relates to a treatment process in the field of sewage treatment and reuse, in particular to a composite membrane bioreactor for efficient sewage treatment and regeneration and reuse. Background technique [0002] Since entering the "Twelfth Five-Year Plan", with the development of my country's environmental protection and the great importance attached to water pollution control and treatment projects, the first-class A discharge of sewage treatment has become the most basic requirement. At the same time, it is aimed at areas with scarce water resources and water shortage , Sewage recycling has become an effective way to alleviate the shortage of water resources. The effluent from traditional secondary biological treatment cannot meet the water quality requirements for direct reuse, and must be combined with certain tertiary treatment technologies, which leads to problems such as large footprint and complicated process. Membrane bioreactor...

AI Technical Summary

Problems solved by technology

[0003] 1) The nitrogen removal efficiency of the system is low, and the concentration of TN in the effluent is high

The traditional MBR process cannot achieve denitrification due to the existence of the non-anoxic zone. Although various improved MBR processes can build a certain anoxic zone and achieve a certain denitrification effect, the overall denitrification efficiency of the system is still low. There is room for improvement, and there is still room for optimization of the system outlet TN

[0004] 2) Filler dosing is difficult to control

Suspended fillers are added to the reactor. Due to the complexity of the system fluid state, the membrane components may be damaged by friction and the service life of the membrane components will be reduced.

[0006] 4) Membrane fouling is serious, backwashing is frequent, and treatment costs are high

Although various improved processes have a certain mitigation effect on membrane fouling, as far as the current usage is concerned, membrane fouling is still very serious, and backwashing is frequent, which leads to an increase in treatment costs. At the same time, membrane fouling indirectly affects the service life of membrane modules. , which limits the large-scale application of the process

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