High-efficiency and low-energy MBR device and method capable of delaying membrane pollution

Abstract

The invention discloses a high-efficiency and low-energy MBR (membrane bioreactor) device and method capable of delaying membrane pollution. According to the device, the internal structure and the aerating mode of the MBR is improved. The aeration rate is controlled, so that an aerobic zone is in an aerobic state to form a micro-ecological environment based on aerobic microorganisms and facultative microorganisms so as to digest pollutants in a centralized manner; in a pre-settling region, effluent suspended solids in the pre-setting region are minimized by means of a sludge settling effect, the influence of the suspended solids on a membrane assembly in the membrane reaction region is relieved, and the service life of the membrane assembly is prolonged; the aeration rate is controlled, so that the membrane region is in an anoxic condition to form the micro-ecological environment based on anoxic microorganisms; a pneumatic water lift is additionally arranged in the membrane reaction region, so that a sludge water mixed liquid in the membrane reaction region returns to the aerobic reaction region. According to the device and method disclosed by the invention, flow regimes of anoxic zone-aerobic zone-pre-setting region-anoxic zone and a return system are formed to realize the biochemical processes of nitration and phosphorus absorption of the aerobic zone and denitrification and phosphorus release of the anoxic zone, so that the treatment effect of an aerobic or facultative membrane bioreactor is intensified.

Description

[0001] technical field [0002] The invention relates to a membrane bioreactor, in particular to a high-efficiency and low-energy MBR device and method for delaying membrane fouling with aerobic bacteria as dominant strains and facultative bacteria as auxiliary strains. Background technique [0003] Membrane bioreactor is a new type of sewage treatment method that has developed rapidly in recent years. It is a new method that combines membrane separation technology and biological reaction technology, replaces the secondary settling tank of the traditional method, and significantly improves the quality of effluent water. With the improvement of membrane production technology, membrane performance has been continuously improved, and its production cost has been continuously reduced, which provides conditions for the popularization of membrane bioreactors. Membrane bioreactors that have appeared in recent years include aerobic, facultative and other types. [0004] At present...

AI Technical Summary

Problems solved by technology

[0004] At present, in aerobic membrane bioreactors, in order to provide enough oxygen for aerobic microorganisms and maintain effective flushing of membrane components, they are generally equipped with large Fans with high power, because some running energy consumption is very high

Moreover, good-type membrane bioreactors use aerobic bacteria as the dominant strain, which has a short reproduction cycle and fast death rate, forming a large amount of excess sludge, which is difficult to treat

In an aerobic environment, microorganisms can only digest ammonia nitrogen and absorb phosphorus, lack of anaerobic or anoxic stage, and the effect of nitrogen removal and phosphorus release is poor

[0005] The facultative membrane bioreactor concentrates the aeration intensity on the bottom of the membrane module to form a partial aerobic environment, and forms a facultative environment in the rest of the area. For the dominant flora, the coexistence of aerobic bacteria and facultative bacteria improves the rapid degradation of organic matter, reduces the output of excess sludge, improves the effect of nitrogen and phosphorus removal, and reduces the equipment power of membrane bioreactors , but at the same time it also reduces the scouring effect on the membrane module and increases the load on the membrane module, so the microbial flora is easy to adhere to the membrane module, which causes the blockage of the membrane module and reduces the service life of the membrane module

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