Four-stage three-phase fluidized bed step-feed deep nitrogen removal system

Abstract

The invention belongs to the field of domestic sewage purification, and relates to a method for treating domestic sewage by adopting a four-stage three-phase step-feed deep nitrogen removal system. The method solves the problems that the conventional domestic sewage treatment process is poor in nitrogen removal effect and difficult to reach the specified standards, and can fulfill the upgraded reforming goal of the conventional sewage plant on the premise that the civil facilities are not changed. The method comprises the step of respectively delivering the domestic sewage to a reactor from anoxic zones of four stages, wherein the anoxic zones and aerobic zones are arranged at intervals, so that nitration liquid reflux facilities of the system are saved; and sludge reflux is only performed in the first anoxic zone, so that the energy is saved and nitration liquid required by denitrification can be supplied to the first anoxic zone. A fluidized filling material is added into the aerobic zones, and a fluidized bed is organically combined with a step-feed process, so that the advantages of increasing the biomass and the bioactivity of the system, reducing sludge, enhancing the three-phase system in the system and the like are achieved.

Description

technical field [0001] The invention belongs to the field of domestic sewage treatment, and in particular relates to the deep denitrification treatment of domestic sewage realized by using a four-stage three-phase fluidized bed segmented water inlet system. Background technique [0002] In recent years, with the rapid development of my country's socialist economic construction and the continuous improvement of the level of industrialization and urbanization, the water pollution in my country has become more and more serious. Many polluted water bodies have seriously affected the production of industry and agriculture. Destruction and environmental pollution are hindering the development of our national economy more and more seriously. The eutrophication of water body seriously destroys the function of water body, reduces the utilization value of water resources, and constitutes a serious threat to urban politics, economy and natural environment. It is generally believed tha...

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Problems solved by technology

[0003] The present invention aims at the fact that it is difficult to meet the latest "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB 18918—2002) by using traditional methods to treat domestic sewage effluent total nitrogen in my country Standard issue, providing a four-stage three-phase biological fluidized bed domestic sewage treatment system

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