A method for cultivating nitrosated granular sludge for treating urban domestic sewage at room temperature

Abstract

The invention relates to a culture method of granular nitrosation sludge for treating urban domestic sewage at a normal temperature, and belongs to the field of water environment restoration and regeneration and the field of autotrophic nitrogen removal of sewage treatment plants. The method comprises the following steps: firstly, inoculating nitration sludge in a sewage plant and forming high free ammonia by utilizing the high ammonia nitrogen content and high pH (Potential Of Hydrogen) of the digested sludge so as to eliminate NOB (Nitrite Oxidizing Bacteria) and purify AOB (Ammonia Oxidizing Bacteria), thereby realizing the stable running of a nitrosation process; then, replacing the feeding water with the urban domestic sewage and manually adding ammoniacal nitrogen so as to continuously accelerate the gas ascending velocity and increase the gas shearing force to gradually shorten the precipitation time, regulating the aeration quantity to guarantee the certain total nitrogen loss, the certain ammonia oxidation rate and the certain nitrosation rate so as to realize flocculent sludge granulation; finally, replacing the feeding water with the urban domestic sewage and enhancing the treatment performance of the sludge. Thus, the granular nitrosation sludge for treating the urban domestic sewage at the normal temperature is successfully cultured.

Description

technical field [0001] The invention belongs to the field of water environment restoration and regeneration and the field of autotrophic denitrification of sewage treatment plants. Specifically, the invention relates to a starting method for treating nitrosated granular sludge of normal-temperature, low-ammonia-nitrogen urban domestic sewage. Background technique [0002] Since the Eleventh Five-Year Plan, the state has stepped up efforts to control environmental pollution, especially in the restoration of the water environment, and implemented a major national science and technology project - Water Pollution Control and Treatment, with an investment of 11.266 billion yuan. This figure will further increase to more than 14 billion yuan. This move is to solve the problem of water eutrophication caused by excessive discharge of nitrogen and phosphorus in recent years. According to the 2012 Environmental Status Bulletin, the surface water in the country is generally slightly ...

AI Technical Summary

Problems solved by technology

Anaerobic ammonium oxidation requires influent NO 2 - -N / NH 4 + -N ratio is 1.32:1, strict water inlet conditions become the technical bottleneck restricting the development of this process

Nitrosification is its premise and basis. In actual research, there are problems such as difficult retention and growth of sludge, poor impact load resistance, and easy instability in long-term operation.

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