An optimized treatment process and device for coking wastewater

Abstract

The invention relates to a coking wastewater optimizing treatment process and device. The process is as follows: light oil and heavy oil contained in the coking wastewater are firstly removed in an oil separator; then air flotation treatment is carried out to reduce ammonia nitrogen; water distribution is carried out in a regulating tank; after water distribution, 70% of the coking wastewater is introduced into an aerobic tank 1, and 30% of the coking wastewater is introduced into an anaerobic tank; after the coking wastewater is subjected to treatments in the aerobic tank 1, a sedimentation tank I, the anaerobic tank, an aerobic tank 2, a sedimentation tank II, a coagulative precipitation tank and a deep treatment tank in sequence, the quality of the final effluent is as follows: COD is lower than 80 mg / L, ammonia nitrogen is lower than 10 mg / L, volatile phenol is lower than 0.3 mg / L, cyanogen is lower than 0.2 mg / L, oil and suspended solids are basically removed, and water quality indicators meet the discharge standards. According to the invention, the process route is short, the equipment investment cost is low, the processing efficiency is high, the effect is stable, energy conservation and cost reduction are achieved, and economic and social benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to an optimized treatment process and device for coking wastewater. Background technique [0002] Coking wastewater is produced in the process of coking, gas production and recycling of chemical products. Its water quality is complex, its production volume is large, its toxicity is high, and its pollution is serious. In addition to inorganic compounds such as ammonia nitrogen, sulfur cyanide, sulfide, and cyanide, sewage also contains monocyclic or polycyclic aromatic compounds such as phenol, naphthalene, pyridine, and quinoline, as well as compounds containing nitrogen, sulfur, and oxygen. Heterocyclic organic pollutants are one of the difficult industrial wastewaters. [0003] At present, A / O or A2 / O process is mainly used for coking sewage treatment technology at home and abroad, and the denitrification mechanism is full nitrification and denitrification...

AI Technical Summary

Problems solved by technology

[0003] At present, A / O or A2 / O process is mainly used for coking sewage treatment technology at home and abroad, and the denitrification mechanism is full nitrification and denitrification. The reflux ratio is limited, and the raw water is limited by the C / N ratio. Therefore, a large proportion of nitrifying liquid needs to be refluxed to the denitrification tank for denitrification, which consumes a lot of power and the actual sewage hydraulic retention time is short; 2) Due to the low C / N ratio of coking sewage, Additional carbon sources are required to maintain denitrification and denitrification; 3) Long process flow, large structures, high infrastructure investment, and large floor area; 4) High processing costs

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