Coal chemical wastewater treating technique

Abstract

The invention relates to a coal chemical wastewater treating technique, which comprises the following steps of: pretreating the coal chemical wastewater by an air-floatation device and obtaining pretreated wastewater; adding a fenton reagent into the pretreated wastewater to carry out secondarily treatment and obtaining secondarily treated wastewater; putting the secondarily treated wastewater into an activated sludge aeration pool and adding active carbon powder into the pool for deep treatment to obtain deeply treated wastewater; separating the deeply treated wastewater with a hyperfiltration membrane and obtaining separated recycled water; reversely penetrating the separated recycled water with a selective semi-permeable membrane and obtaining reversely penetrated recycled water; evaporating and crystallizing the reversely penetrated recycled water and finishing the wastewater treatment. The wastewater, after treated by the coal chemical wastewater treating technique, can realize the 'zero discharge' standard, meet the national environmental requirements, and obtain good economic and social benefits.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a coal chemical wastewater treatment process applied in the coal chemical industry. Background technique [0002] The coal chemical industry uses coal as a raw material and undergoes chemical processing to convert coal into gas, liquid, solid fuel and chemical products. It is mainly divided into coal coking, coal gasification, coal gasification to ammonia, coal gasification to other products, and direct liquefaction. . The wastewater produced in the coal chemical industry is a high-concentration organic wastewater with high chemical oxygen demand (Chemical Oxygen Demand, COD for short), high ammonia nitrogen content index, high chroma and high turbidity. [0003] The process for treating wastewater generated in the coal chemical industry in the prior art generally includes three steps, namely a pretreatment method, a secondary treatment method and an advanced treatment method. ...

AI Technical Summary

Problems solved by technology

This method can achieve good results, but there are problems such as large amount of adsorbent, high cost and secondary pollution, etc. It is generally suitable for small-scale sewage treatment applications

[0007] Moreover, the process of treating wastewater generated in the coal chemical industry in the prior art cannot achieve "zero discharge" of wastewater, which still contains a certain amount of refractory organic matter, and the COD value is high, which cannot fully meet the discharge standard

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