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Coking wastewater optimizing treatment process and device

A technology for coking wastewater and treatment process, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. and other problems, to achieve the effect of good effluent effect, high load and high treatment efficiency

Active Publication Date: 2015-09-30
辽宁中冠环境工程股份有限公司
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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

Method used

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  • Coking wastewater optimizing treatment process and device

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Embodiment Construction

[0021] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0022] See figure 1 , is a process roadmap of the present invention, and a kind of coking wastewater optimization treatment process of the present invention comprises the following steps:

[0023] 1) Coking wastewater from coking, gas purification, and chemical product refining processes. After ammonia distillation, the ammonia nitrogen is reduced to 200-500mg / L; first stay in the grease trap for 1.5 to 2 hours to remove the light oil and heavy oil in the coking wastewater, and then reduce the ammonia nitrogen in the coking wastewater through air flotation treatment. The water quality of coking wastewater after air flotation treatment is: COD<4000mg / L, ammonia nitrogen<300mg / L, oil<30mg / L, SS<10mg / L, phenol<100mg / L, cyanide<20mg / L;

[0024] 2) Put the coking wastewater treated by oil separation and air flotation into the regulating tank and mix ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 崔崇凡庆国梅冬彭立红王婧王琼张晓利
Owner 辽宁中冠环境工程股份有限公司
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