Autotrophic nitrogen removal method for biological phosphorus removal of urban sewage based on short-cut denitrification for providing nitrite

Abstract

The invention discloses an autotrophic nitrogen removal method for biological phosphorus removal of urban sewage based on short-cut denitrification for providing nitrite. The method comprises the following steps: firstly feeding urban sewage into an anaerobic zone of a biological phosphorus removal nitrogen removal reactor, wherein short-cut denitrification is firstly carried out on denitrifying bacteria on a biological membrane so as to reduce nitrate nitrogen in return sludge to nitrite nitrogen, anaerobic ammonium oxidation bacteria on the biological membrane further convert nitrite nitrogen and nitrite nitrogen into nitrogen while anaerobic phosphorus release is carried out on phosphorus-accumulating bacteria in floc sludge; then feeding the sewage into the anaerobic zone again, wherein short-cut denitrification is carried out on the denitrifying bacteria on the biological membrane so as to reduce nitrate nitrogen in return sludge to nitrite nitrogen, and anaerobic ammonium oxidation bacteria on the biological membrane further convert nitrite nitrogen and nitrite nitrogen into nitrogen; then feeding the sewage into an aerobic zone and ammonia oxidizing bacteria and nitrite oxidizing bacteria in the floc sludge oxidize residual ammonia nitrogen in the sludge to nitrate nitrogen; and finally, implementing residual phosphorus removal and autotrophic nitrogen removal of urban sewage of a continuous flow, wherein the treatment energy consumption of an urban sewage plant is reduced.

Description

technical field [0001] The invention relates to a method for biological phosphorus and autotrophic denitrification of urban sewage based on short-range denitrification to provide nitrite, and belongs to the technical field of sewage biological treatment. Background technique [0002] The discovery of anammox bacteria has changed people's understanding of the nitrogen cycle pathway, making it possible for sewage autotrophic denitrification. Compared with traditional heterotrophic biological denitrification, anammox autotrophic denitrification can save aeration, because only half of the ammonia nitrogen in sewage needs to be oxidized to nitrite nitrogen, while traditional heterotrophic biological denitrification requires All ammonia nitrogen is oxidized to nitrate nitrogen; at the same time, anammox autotrophic denitrification does not require an organic carbon source, because anammox bacteria use inorganic carbon as a carbon source, which can maximize the organic matter in se...

AI Technical Summary

Problems solved by technology

The bottleneck restricting the application of anammox technology in urban sewage treatment plants is that the substrate nitrite of anaerobic ammonium oxidation reaction cannot get a stable supply

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