Nitrating aeration biological filting tank of oyster shell filling

Abstract

A nitrifying and aerating biologic filtering pool with oyster shells as filler for denitrifying sewage is composed of pool body, bearing plate with at least one hole, oyster shells on said bearing plate, water and air distributing unit under said bearing plate, the water discharging and back flushing unit consisting of water distributing tube, air distributing tube and water and air distributing chamber, and external aerator.

Description

technical field [0001] The invention relates to a biological filter for denitrification of sewage, in particular to a nitrification aerated biological filter using oyster shell filler. Background technique [0002] Existing methods for removing nitrogen from sewage include physical, chemical and biochemical methods. The biochemical denitrification process has been widely used because of its high ammonia nitrogen removal rate, less secondary pollution, and low operating costs. [0003] The biochemical method includes three reaction processes: ammonification reaction, nitrification reaction, and denitrification reaction. Nitrogen mainly exists in the form of ammoniacal nitrogen in the effluent of the secondary treatment of urban sewage, while the tertiary treatment requires a denitrification process mainly including nitrification. In addition, wastewater from many industries such as iron and steel, oil refining, chemical fertilizers, inorganic chemicals, ferroalloys, glass m...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the problem that alkalinity reagent needs to be supplemented in the operation of the existing traditional packing nitrification biological aerated filter, and provide a kind of oyster shell packing nitrification aeration with no alkalinity reagent supplement, high ammonia nitrogen removal rate and low operating cost. Gas biofilter

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