Comprehensive treatment process for semi-coking wastewater

Abstract

The invention relates to the field of wastewater treatment technologies in environmental protection and particularly relates to a comprehensive treatment process for semi-coking wastewater. The process is characterized by comprising the processing procedures of ammonia blowing, catalytic wet oxidation, catalyst recycling and biological contact oxidation, wherein the procedures are sequentially carried out; both the ammonia blowing procedure and the catalytic wet oxidation procedure are assisted by a gas-liquid mixer, so as to pre-treat the semi-coking wastewater, on one hand, the concentration of pollutants is lowered, and on the other hand, toxic and harmful pollutants in the wastewater are transformed into readily-biodegradable low-toxicity micromolecular pollutants and the biodegradability of the wastewater is improved; then, the biological contact oxidation treatment is carried out, so that the treated water can reach emission requirements. Compared with the prior art, the process has the beneficial effects that the energy consumption is reduced, the requirements for pH values are relatively low, and the usage amount of industrial base is reduced; the temperature and pressure required for reaction are lowered greatly on the premise that a relatively high COD (Chemical Oxygen Demand) removal rate is guaranteed, so that the process has an important significance in sustainable development.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment in environmental protection, in particular to a comprehensive treatment process for blue carbon wastewater. Background technique [0002] Semi-coke wastewater is industrial wastewater produced during the production of semi-coke by medium-low metamorphic and weakly cohesive lump coal in the process of medium-low temperature carbonization. Its pollutant composition contains not only a large amount of phenolic organic pollutants, but also cyanide and ammonia nitrogen, etc. Poisonous and hazardous substances. There are obvious differences in water quality between semi-coke wastewater and wastewater produced by conventional coking, with COD as high as 15,000-50,000 mg / L, NH 3 The -N content is as high as 2000-5000mg / L, and the phenol content is as high as 3000mg / L or more. The biodegradability is worse and the treatment is more difficult. [0003] At present, many semi-coke enterprises a...

AI Technical Summary

Problems solved by technology

Although the single technology of semi-carbon wastewater treatment has achieved good results in the laboratory research stage, however, the system solutions that can be used in industry have yet to be explored, and most of the existing technologies have problems such as high treatment costs and complicated processes that need to be improved

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