Biofilm-based two-stage reinforced half-nitrosofication coupled anaerobic ammonium oxidation treatment device and method for urban domestic sewage

Abstract

The invention provides a biofilm-based two-stage reinforced half-nitrosofication coupled anaerobic ammonium oxidation treatment device and method for urban domestic sewage, and belongs to the technical field of wastewater biological treatment. The device is mainly formed by connection of a raw water tank, a reinforced half-nitrosofication SBBR reactor, a middle water tank and an anaerobic ammoniumoxidation MBBR reactor in sequence. The method comprises the following steps: the urban domestic sewage firstly enters the reinforced half-nitrosofication SBBR reactor, front anoxic stirring can store an inner carbon source, low-oxygen aeration realizes half-nitrosofication, and the treated urban domestic sewage enters the anaerobic ammonium oxidation MBBR reactor for denitrification. The deviceand method provided by the invention solve the problems of low nitrogen removal efficiency and high effluent water total nitrogen of the urban domestic sewage, make full use of a carbon source in thedomestic sewage without the need for an external carbon source; and in addition, the biofilm-based reinforced half-nitrosofication coupled anaerobic ammonium oxidation process has a high nitrificationspeed and a high nitrogen removal load and total nitrogen removal rate, and can realize deep denitrification of the urban domestic sewage.

Description

technical field [0001] The invention relates to a biofilm-based two-stage enhanced semi-short-range nitrification coupled anaerobic ammonia oxidation device and method for treating urban domestic sewage, belonging to the technical field of wastewater biological treatment. Background technique [0002] At present, urban domestic sewage is mostly treated by traditional biological nitrification / denitrification process (A 2 / O, A / O process), and the denitrification process requires organic carbon sources as electron donors to convert NO x - -N reverts to N 2 , and the problem of low C / N in urban domestic sewage generally exists in my country. The carbon source in domestic sewage is insufficient, resulting in low denitrification efficiency and high total nitrogen in the effluent, which cannot meet the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918- 2002) Tier 1 A emission standard, while using a higher aeration rate to reduce NH 4 + -N is all oxidi...

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Problems solved by technology

In addition, the growth rate of anammox bacteria was slow (the highest growth rate was 0.0027h -1 ), the generation cycle is long (10-14d), the activity is easily affected by environmental changes, and the large amount of nitrogen generated by the anaerobic ammonium oxidation process makes the sludge suspended in the reactor, and the sedimentation performance is poor, which makes the bacteria easily Loss, resulting in unstable denitrification effect of the system

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