On-line self-cleaning flexible membrane bioreactor with high flux and low energy consumption

Abstract

The invention discloses an on-line self-cleaning flexible membrane bioreactor with high flux and low energy consumption, which relates to a sewage treatment technology of the membrane bioreactor, and is suitable for purifying micro-polluted water, domestic sewage and industrial wastewater capable of being subjected to biochemical treatment. The on-line self-cleaning flexible membrane bioreactor consists of a membrane bioreactor (1), a zipper flexible membrane component (2), a chain, a V-shaped scraper (3), a gear roller shaft (4), and a microporous aeration pipe arranged in the membrane bioreactor, wherein the zipper flexible membrane component (2) and the chain are combined through a zipper and arranged on the gear roller shaft (4). During cleaning, water is injected or emptied by a cleaning water tank, the obtained potential energy is converted into cleaning driving force, the zipper flexible membrane component (2) is driven to rotate around the gear roller shaft up and down, and pollutants on a membrane surface is scraped by the V-shaped scraper (3) and are separated from the membrane bioreactor (1). The on-line self-cleaning flexible membrane bioreactor has the advantages of high flux, small aeration amount and occupied area, low energy consumption and operating cost, and capability of effectively controlling membrane pollution.

Description

technical field [0001] The online self-cleaning flexible membrane-bioreactor with high throughput and low energy consumption relates to membrane-bioreactor sewage treatment technology, and is suitable for purifying micro-polluted water, domestic sewage and industrial wastewater that can be biochemically treated. Background technique [0002] The submerged membrane bioreactor (Submerged Membrane Bioreactor, referred to as SMBR) places the membrane module directly in the activated sludge bioreactor, and uses negative pressure suction or gravity head to make the permeate pass through the membrane surface to achieve solid-liquid separation. Aeration and flushing of the membrane module under the module prevents the sludge from adhering to the membrane surface to form a mud cake layer, and to a certain extent inhibits the development of gel layer fouling. The submerged membrane-bioreactor has the advantages of low effluent turbidity (less than 1 NTU), good water quality, compact s...

AI Technical Summary

Problems solved by technology

[0005] In actual operation, in order to control membrane fouling, the aeration rate used in the submerged membrane-bioreactor is much higher than the aeration rate required for biochemical reactions, and the gas-water ratio is several times that of the conventional activated sludge method. More than 0.7 yuan / ton, which is far greater than the power consumption of the conventional activated sludge process, which greatly increases the operating cost of the submerged membrane-bioreactor, and is economically unacceptable

In addition, in order to prolong the stable operation period of the membrane module, the membrane module adopts subcritical flux operation, which causes unnecessary waste of membrane area, increases investment cost, expands the occupied area, and weakens the efficiency of the submerged membrane-bioreactor. Economic advantage

High power consumption and unnecessary investment in membrane components limit the large-scale application of submerged membrane-bioreactors

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