Method for integrally treating coking wastewater

Abstract

The invention provides a method for integrally treating coking wastewater, which is based on engineering practice of treating the coking wastewater based on a high-efficiency integrated innovative process technology of miscible nano air flotation enhanced flocculation, A2O, a biological fluidized bed, multi-medium filtration, catalytic ozonation, ultrafiltration and reverse osmosis. The technical purposes of zero dilution and zero discharge of the coking wastewater and reuse of 64% of the wastewater to a coking circulating water supply system are achieved, main advanced technical indexes such as COD (Chemical Oxygen Demand) of effluent of the treated wastewater is less than or equal to 30mg / L, ammonia nitrogen is less than or equal to 5mg / L and the like, and particularly for concentrated water generated by a membrane filtration process, after the technical measures of adopting a special cyanide removal agent and performing coagulating sedimentation treatment, the effluent of the treated wastewater is subjected to zero dilution and zero discharge and 64% of the wastewater is recycled to a coking circulating water supply system. And the water quality index completely meets the Emission Standard of Pollutants for Coking Chemical Industry (GB16171-2012).

Description

technical field [0001] The invention relates to the field of biochemical wastewater treatment; in particular, it relates to a method for integrated treatment of coking wastewater. Background technique [0002] Coking wastewater is the most difficult to degrade toxic and harmful organic wastewater. It has the characteristics of large discharge, high concentration of pollutants, and complex components. It has long been troubled by the environmental protection development of iron and steel enterprises due to the difficulty and cost of treatment, and has become a technical bottleneck for green development. , especially the coking wastewater treatment process has always followed the traditional process and the raw water treatment volume of wastewater needs to be diluted with new water in equal proportions to meet the water quality indicators of the subsequent biochemical treatment process, which cannot well meet the increasingly higher requirements. Environmental requirements. ...

AI Technical Summary

Problems solved by technology

[0002] Coking wastewater is the most difficult to degrade toxic and harmful organic wastewater. It has the characteristics of large discharge, high concentration of pollutants, and complex components. It has long been troubled by the environmental protection development of iron and steel enterprises due to the difficulty and cost of treatment, and has become a technical bottleneck for green development. , especially the coking wastewater treatment process has always followed the traditional process and the raw water treatment volume of wastewater needs to be diluted with new water in equal proportions to meet the water quality indicators of the subsequent biochemical treatment process, which cannot well meet the increasingly higher requirements. Environmental requirements

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