Dynamic filtering-membrane bioreactor for sewage treatment and filtering method thereof

Abstract

The invention relates to a dynamic filtering-membrane device for municipal sewage treatment and a filtering method thereof. The dynamic filtering-membrane device consists of a membrane frame, and a dynamic filtering-membrane component, wherein the dynamic filtering-membrane component is inserted into a groove of the membrane frame and the port of the dynamic filtering-membrane component is sealedby waterproof adhesives. The filtering method comprises the following steps: (1) submerging a membrane filtration unit into a bioreactor in which activated sludge is filled, and communicating and connecting a water outlet of the bioreactor and a discharging tube of the dynamic filtering membrane; (2) carrying out aeration on perforated pipe aerators arranged on the two sides of the dynamic filtering-membrane at the bottom of the bioreactor so as to provide oxygen for the growth and proliferation of the activated sludge in the bioreactor and form a circulatory flow, and form a cross flow on the surface of the dynamic filtering membrane; (3) making the mixed liquor in the bioreactor selectively permeate the dynamic filtering membrane under the push of the liquid level differential pressure,then enter the long groove of the membrane frame, and then pass through the discharging tube communicated with the external so as to obtain membrane water; (4) when the dynamic filtering membrane is polluted seriously, starting the hydraulic power for back-surging; and (5) after the membrane pollution is removed, repeating the steps (2) and (3).

Description

technical field [0001] The invention relates to a dynamic filtration membrane reactor for sewage treatment and a filtration method thereof. Background technique [0002] Membrane bioreactor is an organic combination of membrane separation technology and biological reaction process, and replaces the secondary settling tank in the traditional activated sludge process with the high-efficiency separation of membrane technology to achieve mud-water separation and sludge concentration effects that cannot be compared with traditional processes. The effect of sludge bulking is eliminated. It also greatly increases the concentration of activated sludge in the aeration tank, saves the sludge return system, reduces the amount of excess sludge, and effectively intercepts SS, organic matter, pathogenic bacteria and viruses in wastewater through the membrane, greatly improving To treat the effluent water quality. Membrane bioreactors using microfiltration or ultrafiltration have some li...

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Problems solved by technology

[0006] The above two patents are representative technologies of existing dynamic membrane filtration, but their disadvantages are: the composition of the dynamic microfiltration membrane module disclosed in patent CN200510135563. Take it out for cleaning regularly, the structure and application method are relatively complicated, the industrial amplification ability is poor, and it is difficult to apply as a molded product

The dynamic membrane filtration method and device disclosed in patent CN01144189.5 are relatively rough, and the center of the component lacks the support ability for the membrane surface, so dynamic membrane filtration cannot be performed under high pressure. The cleaning method of dynamic membrane contamination is relatively simple, and it is difficult to compare Severe membrane fouling for cleaning

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