External component anaerobic membrane bioreactor and waste water purification process thereof

Abstract

The invention provides an external component anaerobic membrane bioreactor and a waste water purification process thereof. The waste water purification process includes that a mixed liquid in an anaerobic tank is pumped into a ceramic internal pressure pipe type ultrafiltration membrane through a pump for a cross flow filtration, the mixed liquid contains anaerobic bacteria and diatomaceous earth, under the action of pressure difference, clear water is permeated outwards through the ceramic internal pressure pipe type ultrafiltration membrane and is led out, and a concentration mixed liquid reserved in the ceramic internal pressure pipe type ultrafiltration membrane is taken back to the anaerobic tank through a cross flow. Compared with anaerobic membrane bioreactors in prior art, the external component anaerobic membrane bioreactor has the advantages that during operating, a certain amount of the diatomaceous earth is added into the mixed liquid, consequently the scouring and washing effects on the inner wall of the ceramic internal pressure pipe type ultrafiltration membrane can be strengthened, deposition and pollution of impurities to the inner wall of the ceramic internal pressure pipe type ultrafiltration membrane can be effectively reduced, the permeation flux is stabilized, simultaneously the cross flow speed can be reduced, the energy consumption is lowered, the filtering period of the ceramic internal pressure pipe type ultrafiltration membrane is prolonged, and the chemical cleaning frequency is reduced.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to an external module anaerobic membrane bioreactor and a wastewater purification process thereof. Background technique [0002] Anaerobic biological reaction is a conventional process in sewage treatment. It has the advantages of small footprint, simple process, low energy consumption, low sludge output, and can degrade some refractory organic pollutants. Biogas can be used as energy regeneration and is a treatment technology with multiple advantages of environmental and economic benefits. Therefore, it is widely used in the field of wastewater treatment, especially the wastewater treatment of higher concentrations of organic pollutants. [0003] The external anaerobic membrane bioreactor is one of the current anaerobic membrane bioreactors. Specifically, the anaerobic treatment effluent is led out of the reaction tank, and enters the membrane tube through internal pressure for...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an anaerobic membrane bioreactor with an external module to solve the problem that the external anaerobic membrane bioreactor in the prior art needs high-speed water flow to continue washing for a period of time during the cleaning process of the membrane tube. It consumes a lot of water, and can only wash away the large impurities on the tube wall, but the small impurities in the membrane pores cannot be washed away. After a long time, the membrane pores will be blocked, thereby affecting the filtration effect and efficiency of the membrane tube. Even technical problems that affect the service life of the membrane tube

[0006] Another object of the present invention is to provide a wastewater purification process for an external anaerobic membrane bioreactor to solve the need for high-speed cleaning of the external anaerobic membrane bioreactor in the prior art in the process of cleaning the membrane tube The continuous flushing of water for a period of time consumes a lot of energy, and can only wash away the large impurities on the tube wall, while the small impurities in the membrane pores cannot be washed away. After a long time, the membrane pores will be blocked, thus affecting the membrane tube. Filtration effect and filtration efficiency, and even technical problems that affect the service life of membrane tubes

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