Method and device for realizing synchronous and efficient nitrogen and phosphorus removal of low c/n urban domestic sewage by using internal carbon source in single-stage sequencing batch reactor

Abstract

The invention discloses a method and device for realizing synchronous and efficient denitrification and dephosphorization of low C / N urban domestic sewage by using an internal carbon source in a single-stage sequencing batch reactor, belonging to the field of urban domestic sewage treatment. After the urban domestic sewage enters the integrated short-range nitrification endogenous short-range denitrification dephosphorization coupling anammox SBR reactor, the organic carbon source in the urban domestic sewage is converted into the internal carbon source in the bacteria in the pre-anaerobic section, and at the same time Complete the phosphorus release process; in the hypoxic aeration stage, the phosphorus accumulating bacteria absorb a part of the phosphate in the sewage, and the ammonia oxidizing bacteria oxidize a part of the ammonia nitrogen in the raw water to nitrite; Part of the nitrite and the remaining part of ammonia nitrogen produced in the stage are converted into nitrogen gas, and the produced nitrate nitrogen is reduced to nitrite by denitrifying phosphorus accumulating bacteria and denitrifying polysaccharide bacteria, and the denitrifying phosphorus accumulating bacteria further absorb phosphate. The method makes full use of the carbon source in the raw water to realize the simultaneous denitrification and phosphorus removal of low C / N urban domestic sewage, reduces the ineffective loss of the carbon source, lowers the energy consumption, and lowers the sludge yield.

Description

technical field [0001] The invention relates to a method and a device for realizing simultaneous high-efficiency nitrogen and phosphorus removal from low-C / N urban domestic sewage in a single-stage sequencing batch reactor by utilizing an internal carbon source, belonging to the field of low-C / N domestic sewage biological simultaneous nitrogen and phosphorus removal. Background technique [0002] At present, my country's urban domestic sewage treatment plants are faced with the bottleneck of insufficient C / N in the influent, and it is difficult for the effluent to meet the stringent Class A discharge standards. For the traditional denitrification and phosphorus removal process, it is difficult for the denitrification process to have a sufficient amount of carbon source to maintain the denitrification process after nitrification. The blooms also add additional costs to sludge disposal. [0003] For the low carbon and nitrogen ratio of urban domestic sewage in my country, sho...

AI Technical Summary

Problems solved by technology

The technology of pre-removal of carbon for sludge fermentation production capacity is not high in production efficiency for domestic sewage with low carbon-to-nitrogen ratio, and the operating cost and technical requirements for operation and maintenance are more complicated.

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