吹脱-电化学催化氧化组合工艺去除地下水中氨氮  

Removal of ammonia nitrogen from groundwater by combined strippingelectrochemical oxidation process

作　　者：张沈怡佳 陈峰 高卫国 邢绍文 李海翔[1] 李艳红[1] 刘锐平 吉庆华 ZHANG Shenyijia;CHEN Feng;GAO Weiguo;XING Shaowen;LI Haixiang;LI Yanhong;LIU Ruiping;JI Qinghua(College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China;Shanghai Baofa Environmental Technology Co.Ltd.,201900,China;Center for Water and Ecology,School of Environment,Tsinghua University,Beijing 100084,China)

机构地区：[1]桂林理工大学环境科学与工程学院,桂林541004 [2]上海宝发环科技术有限公司,上海201900 [3]清华大学环境学院,水质与水生态研究中心,北京100085

出　　处：《环境工程学报》2023年第6期1860-1867,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金面上项目(52022048,51978371);国家重点研发计划(2021YFC3200603)。

摘　　要：以上海某钢铁工业区固废堆场氨氮污染的地下水为研究对象,研究了单独电化学氧化法、光/电协同氧化法、吹脱-电化学催化氧化组合法对氨氮的去除效果,提出能高效除氨氮且适合工程实际应用的吹脱-电催化氧化组合工艺。结果表明,相较单独电化学氧化,光/电协同氧化体系中的强氧化活性物质(HO·、HOCl、ClO^(-)等)通过自由基链式反应和光解反应生成氧化性更弱的ClO·,反而削弱氨氮去除效果。而吹脱-电催化氧化组合工艺下氨氮、总氮的去除率分别为97.62%、90.23%,出水满足《地下水质量标准》(GB/T 14818-2017)IV类标准。电子顺磁共振(EPR)和活性氯生成实验证实HO·和活性氯(HOCl、ClO^(-)、Cl_(2))在氨氮转化过程中的重要作用。本实验为进一步研究和设计基于电化学法处理废水中的氨氮技术和组合工艺提供了理论依据。In this work,three approaches,including electrochemical,photoelectrocatalytic,and combined stripping-electrochemical oxidation methods,were firstly compared in treating the polluted groundwater containing ammonia nitrogen caused by solid waste in a steel industrial zone of Shanghai.The combined stripping-electrochemical oxidation process with the greatest ammonia nitrogen removal efficiency which is suitable for engineering practical application was proposed.Compared with electrochemical oxidation,the strong oxidizing active substances(HO·,HOCl,ClO~-) in the photo-electric oxidation system could generate weaker ClO· through free radical chain reaction,thus reducing the ammonia nitrogen removal efficiency.For the combined stripping-electrochemical oxidation,the removal rates of ammonia nitrogen and total nitrogen could reach 97.62% and 90.23%,respectively,the corresponding effluent could meet the Class IV standard of Groundwater Quality Standard(GB/T 14818-2017).Through electron paramagnetic resonance(EPR) and active chlorine formation experiments,we demonstrated that HO· and active chlorine(HOCl,ClO~-,Cl_(2))) played crucial roles in the ammonia removal.Our study provides a theoretical basis for designing electrochemical oxidation degradation of ammonia nitrogen technology and combination process.

关 键 词：氨氮 吹脱 电催化氧化 光/电协同氧化 自由基 

分 类 号：X703[环境科学与工程—环境工程]