Nitrogen-containing organic wastewater treatment system and treatment method

Abstract

The invention provides a treatment system for nitrogen-containing organic wastewater, which has an autotrophic denitrification device (30). The autotrophic denitrification device (30) performs denitrification treatment through nitrification treatment and anaerobic ammonium oxidation treatment. The nitrification treatment is a treatment that uses autotrophic microorganisms to oxidize ammonia contained in the water to be treated into nitrous acid under aerobic conditions, and the anaerobic ammonium oxidation treatment is carried out using autotrophic microorganisms under anaerobic conditions. A treatment using ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor, and further provided upstream of the autotrophic denitrification device (30): a suspension for separating suspended organic matter contained in the water to be treated The organic matter separation device (10) and the sludge anaerobic digestion device (40) for anaerobically digesting the suspended organic matter separated by the suspended organic matter separation device (10) are provided with a sludge anaerobic digestion device (40). The digestive fluid of 40) is supplied to the first conveying path (R1) of the autotrophic denitrification device (30). Even in wastewater containing suspended organic matter and a low ammonia concentration, autotrophic microorganisms can be used to effectively carry out anaerobic ammonia removal. Oxidation treatment.

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...

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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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