Clean Coal Technology

2020, v.26;No.128(04) 56-63

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Progress and perspectives of coking wastewater treatment technology

XIA Liquan;CHEN Guifeng;LI Wenbo;GAO Minglong;

Abstract:

Coking,as a traditional coal chemical industry,has developed rapidly,and most of coking enterprises are distributed in North China where there is relatively little water.Therefore,the effective treatment of coking wastewater plays an important role in the sustainable and stable development of coking industry. In this paper,the research progress of coking wastewater treatment technology was discussed based on the source and water quality characteristics of coking wastewater. The shortcomings of the current coking wastewater treatment technology were pointed out,and its development direction was prospected. Coking wastewater is a typical industrial wastewater,which is difficult to be treated because of its characteristics such as large amount of production and high concentration of organic pollutants.Domestic coking enterprises have relatively weak understanding about the importance of pretreatment section,at present the traditional pretreatment technology is still dominant,and the problems such aslow efficiency,high energy consumption and secondary pollution are outstanding,but the magnetic separation technique in the pretreatment section can be of further application.The anaerobic,anoxic and aerobic technology developed in the 20 th century are mainly used in the biochemical treatment section,which are mature and have been widely used.But the biochemical treatment technology has higher requirements for water quality,especially the wastewater carbon nitrogen ratio( C/N)and the concentration of organic carbon source determine to the final effect of biochemical treatment.Microorganis technology and the development of membrane bioreactor in the future will have great development and breakthrough,and anaerobic technology because of its high energy utilization has attracted the attention of many scholars,and the application of anaerobic technology is helpful to build the ideal type of modern wastewater treatment plants.Deep processing section mainly solves the problem of biochemical effluent substandard,and in the " zero emissions" process,there are higher requirements for the water quality of the membrane,so the depth of processing section is to degradate some organic matters more precisely and specifically,and advanced oxidation technology as a new processing technology is developing rapidly and is gradually adopted by more coking enterprises.The results show that the synergetic effect of the optimization coupling of several treatment technologies can further enhance the treatment effect and make the coking wastewater meet the discharge or reuse standards.With the increasingly strict environmental protection policy,factors such as the popularization of " zero discharge" of wastewater,the acceptable treatment cost of enterprises and the water quality characteristics of coking wastewater jointly determine that the coupling and combination of relatively mature deep treatment technologies such as advanced oxidation technology and membrane separation technology will be the key direction of future development.The development trend of coking wastewater treatment in the future is to improve the utilization rate of resources,improve treatment capacity and efficiency,and reduce energy consumption and operating cost. In the process of coking waste water treatment,membrane separation technology is widely used and at the same time,it can produce high concentrations of saline wastewater.The effective treatment of saline wastewater is related to the points and the purity of salt products,and if the organic pollutants in concentrated brine can not be effectively treated,the treatment cost of the follow-up section will be increased and even the hazardous waste of environmental pollution will be produced.Therefore,the effective treatment for high concentration brine is also the focus of the research community urgent problem.

Key Words: coking wastewater;pretreatment;biochemical treatment;deep processing;technology coupling

Abstract:

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Foundation: 中国煤炭科工集团有限公司科技创新创业资金专项资助项目(2018MS002)

Authors: XIA Liquan;CHEN Guifeng;LI Wenbo;GAO Minglong;

DOI: 10.13226/j.issn.1006-6772.19060301

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