System and method for municipal wastewater treatment through continuous flow step-feed water partial nitrification/anaerobic ammonia oxidation

Abstract

The invention provides a system and a method for municipal wastewater treatment through continuous flow step-feed water partial nitrification / anaerobic ammonia oxidation, and belongs to the field of biological sewage treatment. The system comprises a raw water tank, a continuous flow step-feed water partial nitrification / anaerobic ammonia oxidation reactor, an on-line monitoring and feedback system and a vertical-flow type precipitation tank; activated sludge and a biological membrane are combined, partial nitrification is realized in activated sludge, and anaerobic ammonia oxidation is realized in the biological membrane, so that the sludge age ratio contradiction between partial nitrification and anaerobic ammonia oxidation is solved, the stability is enhanced and the efficiency is improved; the on-line monitoring and the feedback system is used for dissolved oxygen control in an aerobic stage, and hydraulic retention time real-time control is combined, so that problems that stabilization maintenance in a continuous flow partial nitrification process is difficult and half partial nitrification cannot be realized are solved; an alternate aerobic or anoxic operation is applied to a continuous flow system to inhibit nitrite-oxidizing bacteria; raw water is fed into all of anoxic stages in a segmental manner, and a silicon source in the raw water is utilized to realize denitrification, so that a problem of nitrate nitrogen is solved.

Description

technical field [0001] The invention relates to the field of biological treatment of sewage, in particular to a system and method for treating urban sewage with continuous flow and segmental short-range nitrification / anammox oxidation. Background technique [0002] After the reform and opening up, my country's economy has continued to develop rapidly, residents' living standards have continued to improve, and the production of domestic sewage has also increased year by year. The pollutants discharged into water bodies have had a huge impact on the environment. Various domestic lakes and freshwater rivers have emerged to varying degrees. Eutrophication phenomenon. In order to solve the impact of urban sewage on the environment, various cities in our country have carried out large-scale construction of sewage treatment plants, which will discharge the sewage after reaching the standard and relieve the pressure on the environment. However, at present, domestic sewage treatment ...

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Problems solved by technology

[0004] At present, the research on the denitrification process of anammox wastewater mainly has the following characteristics: (1) the research on high ammonia nitrogen is relatively mature, and there are many practical engineering applications; (2) the research on anaerobic ammonium oxidation process of low ammonia nitrogen wastewater It has gradually attracted the attention of researchers from various countries, and the related research has gradually increased, but there is almost no practical application; (3) The main difficulty in the research of low-ammonia nitrogen anaerobic ammonium oxidation process lies in the realization and stable maintenance of short-range nitrification; (4) low ammonia nitrogen sewage, especially in cities Domestic sewage has the characteristics of large water volume, large water quality fluctuations, and low water temperature in winter, which also limits the application of anaerobic ammonia oxidation in the field of urban sewage treatment to a certain extent.

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