Multi-stage biochemical domestic sewage processing method and processing unit thereof

Abstract

The invention discloses a multi-stage biochemical domestic sewage treatment method. The method comprises the steps of exposing the domestic sewage inside a first-stage contact-oxidation cabinet to air and pumping the aerated domestic sewage to a second-stage contact-oxidation cabinet; exposing the domestic sewage inside a second-stage contact-oxidation cabinet to air and delivering the supernatant to a settling tank for mud-water separation; delivering the clear liquid in the settling tank to a membrane bioreaction cabinet; and intermittently sucking the membrane assemblies inside the membrane bioreaction cabinet to collect and discharge the clear water. The invention also discloses a domestic sewage treatment device. The device comprises a main body inside which a first-stage contact-oxidation cabinet, a second-stage contact-oxidation cabinet, a settling tank and a membrane bioreaction cabinet are arranged separately. A membrane cabinet aeration pipe, a membrane cabinet return pipe and a filter membrane group are arranged inside the membrane bioreaction cabinet. The invention ensures high quality and low sludge content of the water discharge, and enables the water discharge to meet the strict effluent standard, is widely used in the ship domestic sewage treatment system and the urban domestic sewage treatment system.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for ship or land domestic sewage. The invention also relates to a treatment device adopting the sewage treatment method. Background technique [0002] With the increase of population, the acceleration of urbanization and the rapid development of social economy, the discharge of domestic sewage is increasing. The damage to the environment caused by domestic sewage discharge and the resulting shortage of water resources have become a serious obstacle to economic development. and obstacles to improving people's quality of life. To this end, people are also working with unprecedented determination to find effective ways to turn sewage into resources, and to limit and improve the discharge requirements of domestic sewage by formulating various international conventions and discharge standards. [0003] As far as the discharge of domestic sewage from ships...

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in this existing treatment method: First, this treatment method is not thorough in the treatment of sewage, even if it meets the BOD in the domestic sewage discharge standard 5 required, but unable to meet COD cr emission requirements

Second, the amount of excess sludge and peculiar smell discharged from the settling tank still cannot meet the ideal requirements, and it even costs a considerable amount of money to carry out follow-up treatment of the excess sludge, which is very uneconomical and does not give full play to the maximum potential of sewage biochemical treatment. efficacy

Third, in the traditional continuous aeration process, the filamentous bacteria are excessively multiplied, which causes the sludge to expand, and the expanded sludge will inevitably be carried out with the effluent, causing the repeated pollution of the effluent to exceed the standard, especially It is the ammonia nitrogen index exceeding the standard seriously

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