Method for rapid mutagenesis of autotrophic nitrosation sludge from complete nitrifying sludge

Abstract

The invention discloses a method for rapid mutagenesis of autotrophic nitrosation sludge from complete nitrifying sludge employing a sequencing batch reactor (SBR) mode, and belongs to the fields of water environment restoration and regeneration and the field of autotrophic nitrogen removal of a sewage treatment plant. The method comprises the following steps: firstly, inoculating nitrifying sludge of a sewage plant; controlling high ammonia-nitrogen concentration, high free ammonia and high aeration condition to prevent sludge from bulking, so as to rapidly adapt to an SBR reactor; then gradually eliminating heterotrophic microorganisms under the water condition with high ammonia-nitrogen and absence of an organic carbon source; finally, inhibiting growth of autotrophic bacteria such as nitrite oxidizing bacteria (NOB) under the condition of low dissolved oxygen; purifying nitrosation sludge, so as to successfully achieve transformation from heterotrophic nitrification sludge to autotrophic nitrosation sludge. By adopting the method, the heterotrophic bacteria are eliminated, and the autotrophic nitrosification technology is developed. Compared with the traditional nitrogen removal process, the method is small in oxygen demand, low in energy consumption and free of a lot of organic carbon sources.

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, it relates to a method specially used for normal temperature, SBR mode operation, and rapid mutagenesis of whole-process nitrification sludge into nitrosation sludge. 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 ge...

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Problems solved by technology

[0003] At present, for urban domestic sewage with a low carbon-to-nitrogen ratio, most sewage treatment plants adopt the traditional process based on the principle of nitrification and denitrification for biological denitrification. In order to meet the requirements of denitrification, it is necessary to add an organic carbon source, which consumes a huge amount of energy to return the nitrification liquid to meet the denitrification requirements, which makes the cost of sewage treatment remain high; at the same time, the added carbon source will eventually become a greenhouse gas, causing secondary damage to the environment. secondary pollution, which greatly restricts the development of the sewage treatment industry

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