Sewage treatment process of pre-oxygenation-anaerobic membrane bioreactor

Abstract

The invention relates to the technical field of environmental protection, in particular, relates to a sewage treatment process of a pre-oxygenation-anaerobic membrane bioreactor, solves the problem that synchronous denitrification cannot be performed in a single reactor under strict anaerobic conditions, solves the weakness of single index of pollutant removal of a conventional anaerobic bioreactor process, and provides a new technology for treatment of high-concentration organic matters and nitrogen. The process comprises the following steps: 1) firstly, enabling sewage to enter a pre-oxygenation tank, and controlling the dissolved oxygen concentration of the pre-oxygenation tank to be 4-8 mg / L; 2) enabling the effluent of the pre-oxygenation tank to enter a closed anaerobic membrane bioreactor, and controlling the oxidation-reduction potential of the anaerobic membrane bioreactor to be -300 to -420 mV; and 3) extracting upper gas in the anaerobic membrane bioreactor tank, sending thegas back to the sewage in the treatment tank, keeping sludge in the anaerobic membrane bioreactor in a suspended state, washing a membrane component, treating the sewage by the anaerobic membrane bioreactor, filtering and discharging the sewage by the membrane component in the treatment tank.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a sewage treatment process of a pre-aerobic-anaerobic membrane bioreactor. Background technique [0002] As we all know, water resources are basic natural resources and strategic economic resources, and an important part of a country's comprehensive national strength. With the rapid economic development and urbanization, my country is facing a very severe water environment situation. In the past ten years, my country's industrial sewage discharge has not changed much, and the growth is mainly reflected in the discharge of domestic sewage, so that the total sewage discharge has shown continuous growth. Membrane bioreactor (MBR) is a sewage treatment process that combines membrane separation technology and bioreactor. widely recognized and applied. At present, the most widely used method is mainly aerobic MBR, but it requires high energy consumption in order to m...

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Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the present invention provides a pre-aerobic-anaerobic membrane bioreactor sewage treatment process, which solves the problem of simultaneous denitrification in a single reactor under strict anaerobic conditions, and solves the problem of conventional anaerobic membrane bioreactor Oxygen bioreactor process removes the single weakness of pollutant index, and provides a new technology for the treatment of high concentrations of organic matter and nitrogen

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