Biofilm-based two-stage enhanced semi-short-range nitrification coupled with anaerobic ammonium oxidation device and method for treating urban domestic sewage

Abstract

A biofilm-based two-stage enhanced semi-short-range nitrification coupled anaerobic ammonium oxidation device and method for treating urban domestic sewage belongs to the technical field of wastewater biological treatment. The device is mainly composed of a raw water tank, an enhanced semi-short-range nitrification SBBR reactor, an intermediate water tank, and anaerobic ammonium oxidation MBBR reactor; urban domestic sewage first enters the enhanced semi-short-range nitrification SBBR reactor, and the pre-anoxic stirring can be stored in the carbon source, followed by low-oxygen aeration to realize semi-short-range nitrification, and the treated urban domestic sewage enters the anammox MBBR reactor for denitrification; the invention solves the problems of low denitrification efficiency of urban domestic sewage and high total nitrogen in effluent The problem is to make full use of the carbon source in domestic sewage without adding additional carbon source. In addition, the biofilm-based enhanced semi-short-range nitrification coupling anammox process has a fast nitrification rate, high denitrification load and high total nitrogen removal rate, and can achieve deep denitrification of 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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