Device and method of combination of denitrification, phosphorous removing and residual sludge fermentation of low-carbon-nitrogen-ratio urban domestic sewage

Abstract

The invention relates to a device and a method of a combination of denitrification, phosphorous removing and residual sludge fermentation of low-carbon-nitrogen-ratio urban domestic sewage. The invention relates to the technical field of urban domestic sewage treatment. The system comprises a raw water tank, an A / O reactor, a secondary sedimentation tank, an intermediate water tank, a sludge storage tank, a sludge fermentation coupled denitrification and synchronous anaerobic ammonium oxidation autotrophic nitrogen removal sequencing bath reactor (SFDA-SBR), and a computer. The raw water tank is respectively connected with a water inlet end of the A / O reactor and the water inlet end of the SFDA-SBR. A sludge discharge end of the sludge storage tank is connected with a sludge injection end of the SFDA-SBR. According to the method, low-C / N-ratio urban domestic sewage first enters the A / O reactor from the raw water tank, and is subjected to a nitrification reaction and phosphorous removing; water discharged from the A / O reactor enters the intermediate water tank, and enters the SFDA-SBR with residual sludge and low-C / N-ratio urban domestic sewage. With the device and method, deep denitrification can be realized. A needed carbon source is from organics produced by residual sludge fermentation, such that a sludge reduction effect is provided.

Description

technical field [0001] The invention relates to a device and method for combined excess sludge fermentation of urban domestic sewage with low carbon-to-nitrogen ratio for denitrification and phosphorus removal, and belongs to the technical field of urban domestic sewage biological treatment. Firstly, the phosphorus removal and nitrification reaction are realized in the A / O reactor, and then in the SFDA-SBR, the reduction of sludge and the total nitrogen of sewage are realized under the joint action of hydrolytic acidification bacteria, denitrification bacteria and anammox bacteria. Efficient removal. This technology is suitable for advanced treatment of urban domestic sewage with low C / N ratio (ratio of chemical oxygen demand mass concentration to total nitrogen mass concentration). Background technique [0002] In recent years, the phenomenon of eutrophication caused by excessive nitrogen and phosphorus in water bodies has become increasingly serious, and the ecological en...

AI Technical Summary

Problems solved by technology

The realization of short-cut nitrification generally needs to limit the dissolved oxygen, inhibit free ammonia, and operate at high temperature so that the nitrification reaction can only proceed to the step of nitrite nitrogen. However, in the actual application of treating low C / N ratio urban domestic sewage, due to the Short-cut nitrification is often restricted due to conditions such as difficulty in maintaining stability in salt accumulation, difficulty in raising the temperature of sewage, and unfavorable economic conditions.

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