Method for purifying sewage

Abstract

The invention relates to a method for purifying sewage. The method comprises the following steps: firstly performing biochemical treatment on the sewage through a multifunctional nitration denitrification integrated self-forming dynamic membrane bioreactor; filtering and purifying through a micro-filtration membrane; and filtering and purifying through an ultra-filtration membrane. The self-forming dynamic membrane bioreactor has a cylinder structure and comprises a plurality of self-forming dynamic membrane module units; each self-forming dynamic membrane module unit is composed of a pre-treating reaction area, an aeration reaction area and a half-aeration reaction area from bottom to top; and the reaction areas are separated by pored plates. According to the invention, an anoxic backflow mode or an aerobic-anoxic mode is adopted, a large-aperture netted membrane is used for replacing the traditional micro-filtration or ultra-filtration membrane, and a sewage layer dynamic membrane bioreactor generated on a membrane surface in a running process is utilized to successfully treat domestic sewage and high-concentration wastewater; and for removing nitrogen and hardly degradable substances, the micro-filtration and the ultra-filtration are performed, so that the problem of high cost of ultra-filtration is solved, and an excellent purifying effect is achieved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage purification method. Background technique [0002] At present, in the sewage purification process, in order to improve the sewage purification effect, most of them need to use ultrafiltration membranes for precision filtration. It is quickly polluted, and the cleaning is cumbersome and has to be replaced. With the acceleration of the replacement frequency, the cost of the ultrafiltration membrane is higher, which increases the operating cost of water treatment. Contents of the invention [0003] In order to solve the above problems, the present invention provides a sewage purification method with convenient operation, good purification effect, wide adaptability, low operation cost, reduced ultrafiltration membrane load and prolonging the service life of the ultrafiltration membrane. [0004] The technical solution of the present invention is: in the purificat...

AI Technical Summary

Problems solved by technology

[0002] At present, in the process of sewage purification, in order to improve the effect of sewage purification, most of them need to use ultrafiltration membranes for precision filtration. It is quickly polluted, and the cleaning is cumbersome and has to be replaced. With the acceleration of replacement frequency, the cost of ultrafiltration membrane is higher, which increases the operating cost of water treatment

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