Sewage treatment method and system based on anaerobic-anoxic fluidized biological carrier

Abstract

The invention relates to the technical field of sewage treatment, in particular to a sewage treatment method and system based on an anaerobic-anoxic fluidized biological carrier. The sewage treatment method based on the anaerobic-anoxic fluidized biological carrier comprises the following steps of sequentially sending pretreated raw water into an FBC (fluidized bed combustion) anaerobic tank, an FBC anoxic tank and an aerobic tank, and treating by a nitrogen and phosphorus removal technology, so as to obtain mixed liquid; separating the flows of the obtained mixed liquid, directly sending one part of the mixed liquid back into the FBC anaerobic tank and / or the FBC anoxic tank, and sending the other part of the mixed liquid into a final settling tank to treat, so as to obtain sludge and sewage; draining the obtained sewage into a sewage removal deep treatment unit, and performing subsequent treatment; separating the flows of the obtained sludge, directly sending one part of the sludge back into the FBC anaerobic tank, and sending the other part of the sludge into a sludge deep treatment unit to perform subsequent treatment. The sewage treatment method has the advantages that the biological carrier is added into the anaerobic tank and the anoxic tank to perform enhanced nitrogen and phosphorus removal on the raw water, the effect is good, the energy consumption is low, and the running cost is low.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage treatment method and system based on anaerobic and anoxic fluidized biological carriers, and in particular to a method that can improve the efficiency of denitrification and phosphorus removal and the quality of effluent water with low investment and small footprint 1. A sewage treatment method and system based on anaerobic anoxic fluidized biological carrier with low operating cost. Background technique [0002] At present, the water quality standards of urban sewage treatment plants across the country are constantly improving. Nitrogen and phosphorus removal is a difficult problem in sewage treatment. In order to ensure the effect of nitrogen and phosphorus removal, it is necessary to supplement carbon sources in sewage. However, the above-mentioned sewage treatment methods have the following problems: First, the biological denitrification process is a commonl...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a sewage treatment method and system based on anaerobic and anoxic fluidized biological carriers that can improve the efficiency of nitrogen and phosphorus removal and the quality of effluent water, save investment, occupy a small area, and have low operating costs, so as to solve the problem of The existing biological nitrogen and phosphorus removal process has the problems of poor phosphorus and nitrogen removal effect, long treatment cycle, poor effluent quality, high input cost and high operating cost

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