三维电极电解法去除水中硝酸盐氮  

Removal of Nitrate Nitrogen by Three-Dimensional Electrode Electrolysis Process

作　　者：姚吉[1] 李亮[1] 杨玉飞[1] 貟亚峰 穆岩 

机构地区：[1]上海理工大学环境与建筑学院,上海200093 [2]河北省环境监测中心站,河北石家庄050056

出　　处：《净水技术》2017年第1期49-53,58,共6页Water Purification Technology

基　　金：国家自然科学基金(51208299);上海理工大学校内科技发展项目(16KJFZ060)

摘　　要：催化脱氮、反渗透、电渗析、离子交换等传统处理技术在去除地下水中的硝酸盐氮时存在成本高、处理效果不佳且造成二次污染等问题。对此,选用能深度去除水体中硝酸盐的电化学净水工艺,在传统二维电极体系中填充泡沫金属/颗粒活性炭双填料以构建新型三维电极反应器,探究其去除水中硝酸盐氮的效果,并进一步考察反应的影响因素。试验结果表明,100 mg N/L的硝酸盐氮在303 min的水力停留时间下经2.0 A电流电解,最终去除率可达到91%,总氮去除率为67%,氨氮的转化率仅为23%。单因素试验发现,延长水力停留时间、增大电流强度和加大填充量均可促进硝酸盐氮的降解,提高去除速率;增加氯离子投加量,可提高总氮去除率,改善二次污染问题。There are many problems of high cost, low effect and secondary pollution in removal of nitrate nitrogen by traditional treatment like catalytic denitrification, reverse osmosis, electroosmosis and ion exchange processing technologies. Electrochemical water purification process is employed to remove nitrate from groundwater. The double packing composed of metal foam and granular active carbon was stuffed onto the traditional two-dimensional electrode system to build into a three-dimensional electrode reactor, and different impact factors of the reaction were discussed. The experimental results showed that nitrate removal efficiency was 91% when 100 mg N/L nitrate nitrogen was electrolyzed under the condition of 303 min hydraulic retention time and 2.0 A current. Moreover, the removal efficiency of total nitrogen was 67%, and the transformation rate of ammonia nitrogen was only 23%. The single factor experiments find that the degradation of nitrate nitrogen could be promoted by longer hydraulic retention time, higher current and larger filling amount. The increase of the chloridion dosage not only effectively raised the TN removal efficiency but also improved the secondary pollution.

关 键 词：电化学 粒子电极 三维电极电解法 硝酸盐氮 泡沫金属 

分 类 号：X703[环境科学与工程—环境工程]