Processing system and processing method for nitrogen-containing organic waste water

Abstract

A processing system for nitrogen-containing organic waste water, configured by: comprising an autotrophic denitrifying device (30) that denitrifies by performing nitrification, whereby ammonia contained in water to be treated is oxidized into nitrous acid by autotrophic microbes under aerobic conditions, and anaerobic ammonia oxidation by autotrophic microbes under anaerobic conditions, using ammonia nitrogen as an electron donor and nitrate nitrogen as an electron receptor; comprising, at the stage before the autotrophic denitrifying device (30), a suspended organic matter separation device (10) that separates suspended organic matter contained in the water to be treated, and a sludge anaerobic digestion device (40) that anaerobically digests the suspended organic matter separated by the suspended organic matter separation device (10); and comprising a first transfer path (R1) that supplies digestive fluid from the sludge anaerobic digestion device (40) to the autotrophic denitrifying device (30). The processing system for nitrogen-containing waste water efficiently performs anaerobic ammonia oxidation using autotrophic microbes, even if the waste water has a low ammonia concentration and includes suspended organic matter.

Description

technical field [0001] The invention relates to a treatment system and a treatment method of nitrogen-containing organic wastewater, in particular to a treatment system and a treatment method suitable for nitrogen-containing organic wastewater with relatively low ammonia concentration. Background technique [0002] Conventionally, biological nitrification and denitrification methods using heterotrophic microorganisms, such as cyclic denitrification methods, have been used to treat nitrogen-containing organic wastewater. Such a biological nitrification and denitrification method is a method of decomposing ammoniacal nitrogen in wastewater into nitrogen gas through a nitrification process and a denitrification process. The nitrification process is to oxidize ammoniacal nitrogen in wastewater into sub Nitrate nitrogen, and then use nitrite oxidizing bacteria to oxidize nitrite nitrogen into nitrate nitrogen; the denitrification process is to use heterotrophic denitrification ba...

AI Technical Summary

Problems solved by technology

[0003] However, for the conventional biological nitrification denitrification method, a large amount of oxygen required for aeration supply is required in the nitrification process, so there is a problem that the power cost required for the aeration blower and the like increases. It is necessary to add a large amount of methanol as an organic carbon source, so there is a problem that the cost of medicines increases, and because heterotrophic microorganisms are used, there are problems such as a large amount of sludge generation and high processing costs for excess sludge, etc. The problem of high overall operating costs

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