Research progress on removal of phenol from coal chemical wastewater
The high toxicity and difficult treatment of phenol containing wastewater in coal chemical industry severely restrict the healthy development of China's coal chemical industry.The sources and water quality characteristics of typical coal chemical wastewater from coal to gas,coal to oil,and coal coking processes were analyzed with a focus on the treatment status of coal chemical wastewater using biochemical,extraction,and advanced oxidation methods for phenol removal.The application scope and advantages and disadvantages of activated sludge method,enzyme treatment method,physical extraction method,complexation extraction method,liquid membrane extraction method,photocatalytic oxidation technology,electrochemical oxidation technology,ozone catalytic oxidation technology and wet air oxidation technology were summarized.It can be concluded through comparative analysis that although the bio-chemical method has low cost,obvious phenol removal effect and no secondary pollution,which is generally only suitable for the treatment of low or medium concentration phenol containing wastewater.The extraction method is widely used in practical industrial applications due to its advantages of simple operation,stable operation,and recy-clability of phenolic compounds.The selection of extractants,the design of extraction and reverse extraction processes are crucial for the phenol removal effect and operating costs.Advanced oxidation method uses strong oxidizing groups such as hydroxyl radicals as active substances to mineralize and degrade phenolic compounds.Although it has high dephenolization efficiency,small footprint,and no pollution,it requires large equipment investment,high cost of reagents and catalysts,small treatment scale,and most technologies are still in the research stage,with limited in-dustrial applications.Compared to other methods,extraction and advanced oxidation have greater research potential,and the combination of multiple phenol removal technologies will become the development direction for the industrial application of phenol containing wastewater in coal chemical industry in the future.
万方数据
维普
