Treatment process of membrane bioreactor in nondegradable industrial wastewater

Abstract

The invention discloses a treatment process of a membrane bioreactor in nondegradable industrial wastewater, which comprises the following two stages: 1, continuous water feeding/discharge and aeration stage: while aerating, continuously feeding water into the membrane bioreactor and continuously pumping water, and entering the next stage after operating for a period of time; and 2, anaerobic stage: stopping feeding and discharging water and aerating so that the active sludge is in the anaerobic condition, and repeating the first stage after operating for a period of time. The treatment process can be used to enhance the treatment efficiency for high-concentration nondegradable wastewater, such as dyeing plant wastewater, factory finishing wastewater and the like, and increase the removalrate of total nitrogen, so that the quality of the discharged water can reach the standard for circulating cooling water, thereby converting sewage into resources.

Description

technical field [0001] The invention relates to a treatment method of industrial waste water, in particular to a treatment process of a membrane bioreactor in refractory industrial waste water. Background technique [0002] Membrane bioreactor (MBR) is a new technology combining membrane separation technology and bioreactor. Membrane separation technology is a technical method that uses a special semi-permeable membrane to selectively separate, concentrate or purify different components in a liquid, and is a kind of physical and chemical treatment method. Bioreactor is a technical method that uses microorganisms in activated sludge to degrade organic pollutants in wastewater to achieve sewage treatment. Therefore, membrane bioreactor is a typical combination of biochemical treatment and physicochemical treatment. In the 1960s, American scholars first combined the activated sludge process with membrane separation technology and applied it to the removal of organic pollutant...

AI Technical Summary

Problems solved by technology

[0012] Traditional membrane bioreactors do not have a good application effect in nitrogen and phosphorus removal, especially in the treatment of high-concentration refractory wastewater such as printing and dyeing wastewater, and the removal of total nitrogen is difficult to meet the discharge standard

[0013] Moreover, if the operation mode of the traditional membrane bioreactor is continuous operation, the membrane fouling is more serious, and the membrane flux drops rapidly, so the filter membrane plate needs to be replaced frequently

For this reason, the operation mode of traditional membrane bioreactors is mostly intermittent suction or intermittent aeration, etc. During the intermittent process, membrane fouling can be reduced to a certain extent, but the decline in membrane flux is still obvious and there is no recovery.

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