Advanced treatment process of coal chemical industry wastewater

Abstract

The invention relates to an advanced treatment process and device of coal chemical industry wastewater. The process comprises the following steps: removing oil, performing deacidification and deamination, performing centrifugal extraction and dephenolization, performing catalytic wet oxidation and performing biochemical treatment. The device comprises an oil removal pool, a deacidification and deamination regulating reservoir, an ammonia still, a high speed centrifuge, a catalytic wet oxidation regulating reservoir, a catalytic wet oxidation tower, a biochemical regulating reservoir and an A / O biochemical system which are connected with one another sequentially. The indirect emission standard requirements in the national coking chemical industrial pollutant discharge standard (GB16171-2012) can be met after main pollutants such as chemical oxygen demand (COD), oil, ammonia nitrogen and phenol in coal chemical industry wastewater are treated, and ammonia water and crude phenol can be recovered. Compared with the prior art, the advanced treatment process of coal chemical industry wastewater has the beneficial effects that sewage produced in coal chemical industry is treated with a clear target on the basis of characteristics of the coal chemical industry production process, so that the indirect emission standard requirements are met, available resources in the sewage are recovered, and sewage resource treatment is really realized.

Description

technical field [0001] The present invention relates to the field of coal chemical industry, in particular to the advanced treatment of process wastewater generated in coal chemical production processes such as semi-coke (semi-coke), coal pyrolysis, coal gasification, coal graded utilization, lignite upgrading, and coal clean conversion application. craft. Background technique [0002] my country's coal consumption accounts for 27% of the world's coal consumption, and it is a large coal energy consumer, but the comprehensive utilization rate of coal is at a low level. The development of new coal chemical industry, the implementation of clean coal conversion, the application of low-rank coal (lignite, non-caking coal, weak caking coal, etc.) , an important measure to reduce pollutant emissions. [0003] Lignite is a low-quality fuel with high volatile content, high moisture, high ash content, low calorific value, and low ash melting point. my country is rich in lignite reso...

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Problems solved by technology

[0005] At present, many semi-coke (semi-coke) production enterprises use processes such as airtight oil separation, phenol removal, and ammonia distillation for pretreatment, but it is still difficult to meet the coke quenching standard or biochemical influent requirements for wastewater after these physical and chemical pretreatment methods

At present, the effective treatment technology for semi-coke (semi-coke) wastewater is sewage incineration technology with gas as the heat source, but this technology needs to consume a large amount of gas (the amount of gas consumed per ton of water is 1700m 3 left and right, the calorific value of the gas used is 2000-2200kcal), and the treated effluent is discharged in gaseous form, which cannot realize the recycling of water resources

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