A high ammonia nitrogen low carbon/nitrogen ratio domestic sewage treatment system and method

Abstract

The invention relates to high ammonia-nitrogen low carbon / nitrogen ratio domestic sewage treatment system and method and belongs to the technical field of sewage treatment. An oil removing grating is utilized for removing larger floating objects and grease in sewage; a circular current folded plate regulating tank is arranged for regulating quality and quantity of water; a circular current folded plate anaerobic tank is arranged for hydrolyzing and denitrifying organic matters; a two-stage baffling and double circulation aerobic tank is arranged and connected in series, so that simultaneous nitrogen removal of granular sludge is realized; an efficient rotational flow sedimentation tank is arranged for refluxing partial granular sludge to the circular current folded plate anaerobic tank and the two-stage baffling and double circulation aerobic tank; a chemical catalysis microaeration biological filter (CCBF) is arranged, and a chemical catalysis biological carrier is utilized for removing nitric nitrogen and phosphorus in water, so that total nitrogen and total phosphorus of effluent achieve requirements of regenerated recycle water. The sewage treatment system and method which are provided by the invention have the advantage that various indexes of the effluent achieve or are better than the requirements of the reuse of urban recycling water-water quality for landscape environment water consumption GB / T 18921-2002 and the reuse of urban recycling water-water quality standard for urban miscellaneous water consumption GB / T 18920-2002.

Description

technical field [0001] The invention relates to a domestic sewage treatment system and method with high ammonia nitrogen and low carbon / nitrogen ratio, belonging to the technical field of sewage treatment. Background technique [0002] Domestic sewage in expressway service areas, railway station domestic sewage and sewage in some living areas are characterized by high ammonia nitrogen content and relatively low organic matter, which belong to low carbon nitrogen ratio sewage. When using the traditional A / O biological denitrification process, sufficient nitrifying bacteria are needed to maintain a good nitrification effect, and a longer sludge age is an effective way to maintain the growth of nitrifying bacteria, which also increases the volume of the structure accordingly; , Nitrifying bacteria are often carried out by the effluent of the secondary sedimentation tank, resulting in a decrease in nitrification; at the same time, due to insufficient carbon sources, denitrificat...

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Problems solved by technology

When using the traditional A / O biological denitrification process, sufficient nitrifying bacteria are needed to maintain a good nitrification effect, and a longer sludge age is an effective way to maintain the growth of nitrifying bacteria, which also increases the volume of the structure accordingly; , nitrifying bacteria are often carried out by the effluent of the secondary sedimentation tank, resulting in reduced nitrification; at the same time, due to insufficient carbon source, denitrification efficiency is low, and total nitrogen removal is limited

Membrane bioreactor (MBR) has the advantages of high volume load, small land occupation, low residual sludge output and good effluent quality, but still affected by carbon sources, the denitrification efficiency is low, and the total nitrogen in the effluent cannot meet the discharge requirements. The reduction of water production caused by membrane fouling and the complexity of membrane filtration operations also limit the popularization and application of MBR.

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