电化学法处理蚀刻液中高氨氮废水研究

Electrochemical treatment of high ammonia nitrogen wastewater from etching solution

蚀刻液处理过程中所产生的废水残留有高浓度氨氮,其环境污染风险大且难治理.电化学氧化法因其快速、高效的处理效率受到学术界的广泛重视.文章系统地探讨了电化学氧化法去除蚀刻液处理过程中高含氮废水的机理和影响因素.结果表明:针对初始质量浓度为2000 mg·L^(-1)的模拟氨氮废水,电化学氧化法去除其中氨氮的最佳条件为质量浓度ρC l-=6000 mg·L^(-1)、初始pH=9、电流密度60 mA·cm-2,电解3 h后,氨氮去除率达到86.87%;针对实际废水,氨氮去除率可达75.42%.此外,向电化学体系中引入沸石材料后,模拟废水和实际废水中氨氮去除率可分别提高到92.79%和83.17%.

There is a high concentration of ammonia nitrogen in the wastewater from etching solution treatment,which is difficult to treat and has a high risk of environmental pollution.Electrochemical oxidation has been widely valued by the academic circles because of its rapid and efficient processing efficiency.The mechanism and influencing factors of removal of high nitrogen wastewater by electrochemical oxidation were systematically studied in this paper.The results show that the optimal conditions for removing ammonia nitrogen from simulated ammonia nitrogen wastewater with initial mass concentration of 2000 mg·L^(-1)are mass concentration 6000 mg·L^(-1),initial pH=9,current density 60 mA·cm-2by electrochemical oxidation,and the removal rate reaches 86.87%after 3 h of electrolysis.In view of the actual wastewater,the removal rate of ammonia nitrogen can reach 75.42%.In addition,the removal efficiency of ammonia nitrogen in simulated wastewater and actual wastewater can be increased to 92.79%and 83.17%respectively after zeolite material is introduced into the electrochemical system.