Equipment and method for treating wastewater difficult to be degraded by biology method of hydrolysis composite membrane

Abstract

This invention relates to apparatus and method for treating wastewater by hydrolysis-composite membrane biological method. The apparatus comprises: a multi-grid hydrolysis reactor and a composite membrane bioreactor. The method comprises: (1) introducing wastewater into the multi-grid hydrolysis reactor, and hydrolyzing in an anaerobic condition; (2) introducing the hydrolyzed wastewater into the contact oxidation region of the composite membrane reactor, and performing aerobic biological treatment; (3) introducing wastewater into the membrane separation region of the composite membrane bioreactor, and performing further aerobic biological treatment; (4) returning the sludge produced in the multi-grid hydrolysis reactor and the composite membrane bioreactor to the flow-guide region.

Description

technical field [0001] The invention relates to a device and method for treating refractory wastewater by a hydrolysis-composite membrane biological method, and belongs to the technical field of organic sewage (waste) water treatment. Background technique [0002] For the refractory industrial wastewater with a large volume and wide area, it is difficult to meet the discharge standard by using a single aerobic biological method or anaerobic biological method, and the operating cost is too high if the physical and chemical method is used. The method of using anoxic hydrolysis to pretreat refractory wastewater followed by aerobic biological treatment has been gradually recognized. Anoxic hydrolysis pretreatment has short hydraulic retention time, high conversion rate of refractory organic matter, and can greatly improve the biodegradability of wastewater. The organic matter converted by hydrolysis can be efficiently degraded in the subsequent aerobic stage. The joint treatme...

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Problems solved by technology

[0003] Technical problem: The purpose of this invention is to provide a device and method for treating refractory wastewater by hydrolysis-composite membrane biological method, which organically combines hydrolysis and composite membrane biological method to overcome the poor biodegradability of refractory wastewater existing in the existing process , can not guarantee the residence time, prone to short flow and channel flow, wastewater and sludge cannot be fully mixed and contacted, mud-water separation effect is not good, etc.

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