电极强化人工湿地处理污水脱氮的效果  

Wastewater denitrification by construct wetlands with electrode intensification

作　　者：何媛[1] 王宇晖[1] 宋新山[1] 

机构地区：[1]东华大学环境科学与工程学院,上海201620

出　　处：《环境工程学报》2016年第9期4867-4872,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金青年科学基金(51309053)

摘　　要：将电极与人工湿地耦合,创新性地构建了复合电极人工湿地高效反硝化脱氮装置,提高对污水中总氮和COD的去除效果。为了确定复合电极人工湿地比普通人工湿地脱氮效果更优,研究了碳氮比、进水总氮浓度、水力停留时间、电流强度等因素对复合电极人工湿地和人工湿地脱氮效果的影响。研究结果表明：在室温20～25℃,p H=7.5条件下,引入电极的人工湿地有更好的去除效果,较普通人工湿地总氮脱除效率可高出5.41%。并且确定了复合电极人工湿地的最佳运行条件为碳氮比=0.75,水力停留时间=48 h,进水总氮浓度=75 mg·L-1,电流强度=10 m A。在此条件下,总氮去除率可达53.34%。Electrode-biofilm was coupled innovatively with constructed wetlands （CWs） in this experiment to increase the removal efficiency of TN and COD. For this purpose, a highly effective denitrification reactor e- lectrode-constructed wetlands （E-CWs） were installed. The effects of the C/N ratio, influent total nitrogen load, HRT, and electric current intensity on the denitrification rate were compared between the E-CWs and CWs to im- prove the determination of the removal efficiency of E-CWs. The results indicated that E-CWs have superior re- moval efficiency at air temperatures of 20 to 25 ℃ and pH of 7.5, with the TN removal efficiency being 5.41% higher than CWs. The optimal C/N ratio, HRT, influent total nitrogen load, and the electric current intensity were 0. 75, 48 h, 75 mg· L-1 , and 10 mA, respectively. In addition, the TN removal efficiency reached 53.34%.

关 键 词：电极生物膜 人工湿地 低碳氮比 高效脱氮 

分 类 号：X703[环境科学与工程—环境工程]