Startup and control method for multistage partial nitrification

Abstract

The invention discloses a startup and control method for multistage partial nitrification and belongs to the field of sewage treatment. According to the startup and control method, the problems of lowpossibility of starting, an unstable accumulation effect of nitrite and the like in a traditional nitrification process are solved. The method disclosed by the invention comprises the steps of nitrification startup, intermittent aeration startup, regulation of nitrite accumulation rate, regulation of ammonia oxidation rate, stable operation control over nitrite and the like; finally, the ammonianitrogen oxidation rate is stabilized at 55 to 60 percent, the nitrite accumulation rate is stabilized to be greater than or equal to 92 percent, the ammonia nitrogen removal surface load is greater than or equal to 0.60gN / (m2.d), and the requirements of subsequent anaerobic ammonia oxidation on nitrogen element are met. The startup and control method disclosed by the invention has the advantagesof stable partial nitrification effect, high load of ammonia nitrogen oxidation, reduced occupied area, simple operation and reliable operation; compared with a traditional process, the startup and control method has the characteristics that selection and elimination of microorganisms can be realized and the long-term operating instability is prevented; the utilization rate of oxygen is high and energy consumption of aeration fluidization is low.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for starting and controlling multistage partial nitrosation. Background technique [0002] Anaerobic Ammonium Oxidation (ANAMMOX for short), based on NO 2 - -N is electron acceptor, CO 2 As an inorganic carbon source, under anaerobic conditions, the NH 4 + -N oxidation to N 2 biological process. Compared with the traditional nitrification-denitrification process, the ANAMMOX process has the advantages of saving 50% of the aeration rate and 100% of the organic carbon source, so once discovered, it has attracted widespread interest from many researchers. [0003] Since the anaerobic ammonium oxidation process requires ammonia nitrogen and nitrite nitrogen with a ratio of 1:1.31 as a substrate, a pretreatment process is required to partially oxidize ammonia nitrogen to nitrite nitrogen without generating nitrate nitrogen, that is, partial nitrosation proce...

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Problems solved by technology

[0031] In order to solve the problems in the prior art that the nitrosation process is difficult to run continuously, the ratio of effluent nitrogen is unstable, the long-term operation is easy to convert to the whole process of nitrification, and the sludge concentration is difficult to maintain, etc., the present invention proposes a multi-stage partial nitrosation start-up And control method, adopting this multi-stage partial nitrosation start-up and control method has the advantages of continuous operation, stable treatment effect, long-term operation stability, precise control of effluent nitrogen ratio, convenient management and maintenance, etc.

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