Device for city sewage treatment through continuous flow step water feeding, sludge and fermented sludge step backflow and partial denitrification/anaerobic ammonium oxidation

Abstract

The invention relates to a device for city sewage treatment through continuous flow step water feeding, sludge and fermented sludge step backflow and partial denitrification/anaerobic ammonium oxidation. The device comprises a raw water tank, a continuous flow step water feeding and sludge and fermented sludge step backflow part denitrification/anaerobic ammonium oxidation reactor, a vertical-flowsedimentation tank and the like; anaerobic ammonium oxidation is achieved in a biological membrane of filler, partial denitrification is achieved in active sludge, the device is high in stability, and the efficiency is also greatly improved; raw water enters all anoxic zones step by step, a carbon source in the raw water is used for conducting partial denitrification, and a substrate of an anaerobic ammonium oxidation reaction is generated; sludge flows back to all the anoxic zones step by step, nitrate nitrogen required by the partial denitrification is provided, and the concentration of thesludge in the device is maintained; a part of sludge in a secondary sedimentation tank directly flows back step by step, the other part of sludge in the secondary sedimentation tank enters a fermentation tank for sludge fermentation, then the fermented sludge and remaining sludge are converged and flow back to all the anoxic zones step by step, the carbon source required by denitrification is greatly supplemented, and addition of an outer carbon source is avoided.

Description

technical field [0001] The invention relates to the field of sewage biological treatment, in particular to a device for treating urban sewage by continuous flow segmental water inflow, sludge and fermented sludge segmental reflux part denitrification / anaerobic ammonium oxidation. Background technique [0002] With the continuous development of my country's economy and the continuous improvement of residents' living standards, the output of urban domestic sewage has increased year by year. Pollutants such as nitrogen and phosphorus in domestic sewage will cause great harm to the environment. The typical performance is Numerous lakes in China have experienced varying degrees of eutrophication, which has seriously affected the water quality of lakes and the environment, and brought harm to human health. In order to avoid the direct discharge of domestic sewage into the ecological environment, my country has stepped up efforts to build a number of sewage treatment plants, aiming ...

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Problems solved by technology

[0004] At present, the research on ANAMMOX process mainly has several characteristics: (1) the research on high ammonia nitrogen wastewater such as landfill leachate is relatively mature, and has also been applied in actual production; (2) such as urban domestic sewage with low The research on ammonia nitrogen wastewater is very extensive, and a lot of in-depth research has been carried out, but it has not been applied in the mainstream process of actual sewage treatment plants; (3) the current research focus and difficulty of anaerobic ammonium oxidation process for low ammonia nitrogen wastewater The realization and stable maintenance of nitrification reaction; (4) The main limitations of urban domestic sewage for the application of anaerobic ammonium oxidation process lie in its large water volume, large fluctuations in water quality, and low temperature of sewage in winter.

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