Continuous filtration type municipal sewage treatment method

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a continuous filtration type municipal sewage treatment method. The method comprises the following steps: a) enabling municipal sewage to pass through a coarse screen; b) enabling the sewage flowing through the coarse screen to pass through a fine screen; c) enabling the sewage after garbage removal to enter anadjusting tank for stirring and pre-aeration treatment, and enabling the treated sewage to enter a primary continuous membrane filtration system for filtration; d) performing organic matter removal and nitrogen and phosphorus removal on the sewage by an A / O biochemical pool; e) filtering the sewage by a secondary continuous membrane filtration system; and f) finally, feeding the sewage into a filter tank for ultrasonic disinfection to obtain water reaching the discharge standard after disinfection. The continuous membrane filtration systems are arranged in front of and behind the A / O biochemical pool, so that the solid-liquid separation efficiency is improved, and the operation investment cost is reduced. Ultrasonic disinfection is adopted, so that harmful byproducts are prevented from being generated, irreversible influences on human bodies and the environment are avoided, and the investment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a continuous filtering municipal sewage treatment method. Background technique [0002] Municipal sewage is of relatively stable water quality. The water volume is extremely large, but it is turbid, deep and has a foul smell. It is slightly alkaline, has high nitrogen and phosphorus content, and generally does not contain toxic substances. Bacteria (including pathogens) viruses and parasite eggs. In the case of a large amount of municipal sewage and a large amount of sediment and suspended solids in the water, the previous process would choose to conduct preliminary precipitation on the incoming water as the pretreatment of the subsequent treatment process. However, due to the large amount of municipal sewage, if the precipitation method is used. For pretreatment, the sedimentation tank structure will occupy a very large area, which is very unfavorable for the enti...

AI Technical Summary

Problems solved by technology

In the case of a large amount of municipal sewage and a large amount of sediment and suspended solids in the water, the previous process would choose to conduct preliminary precipitation on the incoming water as the pretreatment of the subsequent treatment process. However, due to the large amount of municipal sewage, if the sedimentation method is used For pretreatment, the sedimentation tank structure will occupy a very large area, which is very unfavorable for the entire sewage treatment station

If you want to improve the sedimentation efficiency, you can also choose to add flocculants and coagulants to speed up the sedimentation speed. However, if you add chemicals, the daily operating costs and labor costs will increase significantly.

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