泡沫镍/活性炭电极电吸附去除水中的NO_2^-  

Performance of nickel foam/activated carbon electrode to remove NO_2^- in wastewater

作　　者：蒋绍阶[1] 熊关全 张若汉 张亚晴[1] 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《环境工程学报》2017年第7期3978-3984,共7页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07424-004);"十二五"国家科技支撑计划项目(2012BAJ25B06-001)

摘　　要：采用涂覆法以泡沫镍为集流体制作活性炭电极并构建电吸附装置,研究电吸附装置去除NO_2^-的最佳运行工况,并在相同条件下对比装置对NO_3^-的去除效果。同时研究了离子强度对装置吸附NO_2^-和NO_3^-的去除效果和电流效率的影响,从节约能耗和提高装置去除效果的角度出发,提出装置去除NO_2^-的最佳方案。结果表明,当废水浓度低于800 mg·L^(-1)时,装置对NO_3^-的去除效果优于NO_2^-;当NO_2^-废水浓度低于700 mg·L^(-1)时,可以将NO_2^-预先氧化或自然氧化成NO_3^-后,再通过电吸附装置去除,能有效提高装置去离子效率并降低电耗成本。The coating method was adopted to use foam nickel as a carrier to build an electric adsorption de- vice. The best voltage and flow rate to remove NO2- and NO3- were studied, along with the influence of solution concentration on the electric adsorption potential and current efficiency at optimal conditions. The best solution to remove NO2- was put forward based on the criteria of reducing energy consumption and improving overall removal efficiency of the device. Experimental results showed that when the wastewater concentration fell below 800 mg ·L^-1, the device was more effective at removing NO3- than NO2-. When the wastewater concentration fell below 700 mg·L^-1 , using the device to remove NO2- after it was oxidized into NO3- can improve the efficiency of the device and save power consumption effectively.

关 键 词：活性炭 电吸附 电压 能耗 电流效率 亚硝酸根 

分 类 号：X703[环境科学与工程—环境工程]