三维电催化氧化法处理高浓度有机废水

Treatment of organic wastewater with three-dimensional electro-catalytic oxidation

以石墨为阳极,钢板为阴极,主电极板间填充具有特异催化功能和导电性能的铁锰双金属改性活性炭催化剂颗粒,进行三维电催化氧化实验,以处理高浓度有机废水。通过浸渍煅烧法制备了铁锰双金属改性活性炭催化剂,且对催化剂的形貌和结构进行了表征和分析;考察了电压、初始pH、曝气量和反应时间等工艺参数对电催化氧化去除乙腈的影响,再确定最佳实验条件后,考察了三维电催化氧化处理有机废水的稳定性、处理实际有机废水的效果。结果表明:铁锰初始比例为1∶2、煅烧温度为550°C、投加量为300 mg·L^(-1)、电压为24 V、初始pH为7、曝气量为4L·min^(-1)时,三维电催化氧化反应60 min处理效果最佳,乙腈去除效率达到96.1%,5次循环实验乙腈去除率仍能保持88.7%。且在处理实际废水中,也能保持高效的去除性能,并能同步去除氨氮。

In this study,graphite as the anode,steel plate as the cathode,and Femanganese dioxide modified activated carbon catalyst as the third electrode were used for three-dimensional(3D)electrocatalytic oxidation to enhance the removal of high concentration organic wastewater.The Fe/Mn bmetallic activated carbon catalysts were prepared by impregnation calcination,and their surface morphology and structure were characterized.The effects of calcination temperature,catalyst composition,voltage,initial pH,aeration volume and reaction time on the removal effect of acetonitrile were investigated by electrocatalytic oxidation.After the optimum conditions were determined,the stability of treating organic wastewater by three-dimensional electrocatalytic oxidation and the effect of treating actual organic wastewater were investigated.The results showed that when the initial mole ratio Fe/M was 1:2,the calcination temperature was 550°C,the best treatment effect by the 3D electrochemical oxidation was achieved at the catalyst dosage of 300 mg·L^(-1),voltage of 24V,the initial pH of 7,the aeration volume of 4 L·min^(-1)and 60 min reaction,then acetonitrile removal efficiency could be 96.1%.After five recycling cycles,the removal efficiency of acetonitrile still maintained at 88.7%.And for actual wastewater,it can also maintain an efficient removal performance with synchronously removing ammonia nitrogen.