Denitrification processing method of coking wastewater and processing arrangement

Abstract

The invention discloses a method and a device for removing nitrogen from coking wastewater. The method comprises the pretreatment and biochemical treatment of a facultative reactor, the biochemical treatment of an aerobic reactor, the biochemical treatment of a secondary sedimentation tank, coagulation treatment (of a coagulation reaction or a coagulation sedimentation tank) and other steps, so as to form a biological nitrogen removal process combining nitrification / denitrification, shortcut nitrification, denitrification and anaerobic ammonium oxidation. The method has the advantages that the method saves power cost by 10 to 18 percent; the water treatment cost per ton of the method is between 3.2 and 3.2 yuan; and the method is stable in operation and convenient to maintain, and has effluent COD [Cr] below 100 ma / l, ammonia nitrogen below 5 mg / l and total nitrogen below 20 mg / l.

Description

technical field [0001] The invention relates to a wastewater treatment technology, in particular to a treatment method and equipment for ammonia nitrogen and total nitrogen in coking wastewater, belonging to the technical field of coking wastewater treatment. Background technique [0002] Coking wastewater has complex components, containing high concentrations of ammonia nitrogen, phenol, cyanide, and a variety of aromatic compounds, and is one of the most difficult industrial wastewater to treat. The treatment technologies of coking wastewater at home and abroad include: physical and chemical methods, biochemical methods and methods combining physical and biochemical methods. Among them, the denitrification methods are mainly biochemical methods, and the biochemical methods include anoxic-aerobic (A / O), anaerobic-anoxic-aerobic (A / A / O), aerobic-anoxic-aerobic ( O-A-O), anoxic-aerobic-aerobic (A-O-O), these treatment processes are all effective methods for denitrification o...

AI Technical Summary

Problems solved by technology

At present, in the treatment of coking wastewater, the denitrification efficiency of coking wastewater is generally low due to the unreasonable design of process parameters, and it is difficult to meet the design target requirements, especially the total nitrogen removal effect is not ideal

Physicochemical denitrification processes include air stripping method, selective ion exchange method, breakpoint chlorination method, and magnesium ammonium phosphate precipitation method. These physical and chemical denitrification methods are difficult to popularize and apply due to high treatment costs and secondary pollution.

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