Device and method for low-C/N ratio municipal wastewater short-cut denitrification/short-cut nitrification anaerobic ammonia oxidation biofilm process

Abstract

The invention discloses a device and a method for a low-C/N ratio municipal wastewater short-cut denitrification/short-cut nitrification anaerobic ammonia oxidation biofilm process, belonging to the field of biological sewage treatment. The method comprises the following steps: allowing municipal wastewater and one part of supernatant subjected to short-cut nitrification anaerobic ammonia oxidation in the previous cycle to simultaneously enter a short-cut denitrification bio-membrane reactor, performing anaerobic stirring, performing short-cut denitrification by fully utilizing a carbon source in raw water, and reducing NO3<-> into NO2<->, so that the influence of organic matters in the raw water on microbes in the subsequent short-cut nitrification anaerobic ammonia oxidation bio-membrane reactor; and pumping the supernatant containing NH4<+> and NO2<-> into the short-cut nitrification anaerobic ammonia oxidation bio-membrane reactor through a peristaltic pump for carrying out an anaerobic ammonia oxidation reaction, performing short-cut nitrification and anaerobic ammonia oxidation on the residual NH4<+> in an intermittent aeration and intermittent stirring manner, and finally draining. According to the method disclosed by the invention, the carbon source does not need to be added, advanced nitrogen removal of the low-C/N ratio municipal wastewater is realized, and the method has the advantages of energy consumption, small treatment amount of residual sludge, and the like.

Description

technical field [0001] The invention relates to a device and method for deep denitrification of short-range denitrification / short-range nitrification anaerobic ammonium oxidation biofilm process of urban domestic sewage with low C / N ratio, belongs to the technical field of sewage biological treatment, and is a method for realizing low C / N Experimental device and method for deep denitrification of urban domestic sewage. Background technique [0002] When the traditional aerobic / anoxic SBR process treats domestic sewage, nitrifying bacteria carry out nitrification reaction under aerobic conditions, that is, NH 4 + -N is oxidized to NO 2 - -N, NO 3 - -N, under anoxic conditions, denitrifying bacteria use the carbon source of domestic sewage for denitrification, that is, NO 2 - -N, NO 3 - -N is reduced to N 2 , and then remove nitrogen in domestic sewage. At present, my country's urban domestic sewage generally presents a low C / N ratio. The lack of carbon sources in d...

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Problems solved by technology

[0005] The patent of this invention aims at the problems of traditional biological denitrification process when treating low C / N ratio urban domestic sewage, poor stability, high energy consumption, low efficiency, complicated operation and management, effluent TN concentration not up to standard, etc., and proposes a short-range denitrification / short-range The nitrifying anammox biofilm process improves the denitrification effect of low C / N domestic sewage, realizes high-efficiency, low-consumption deep denitrification, thereby reducing operating costs

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