流通式电芬顿系统对地下水中As(Ⅲ)的高效去除  

High efficiency removal of As(Ⅲ) in groundwater by a flow through electro-Fenton system

作　　者：柴友正 秦普丰[1,2] 吴志斌 张嘉超 陈安伟[1] 白马[1] 彭程 CHAI Youzheng;QIN Pufeng;WU Zhibin;ZHANG Jiachao;CHEN Anwei;BAI Ma;PENG Cheng(College of Resources and Environment,Hunan Agricultural University,Changsha 410128,China;Hunan Engineering&Technology Research Center for Irrigation Water Purification,Changsha 410128,China)

机构地区：[1]湖南农业大学资源环境学院,长沙410128 [2]湖南省灌溉水源水质污染净化技术工程研究中心,长沙410128

出　　处：《环境工程学报》2021年第8期2609-2617,共9页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划(2017YFD0801505);优秀青年项目基金资助项目(18B095);国家自然科学基金资助项目(51879105);湖南省自然科学基金资助项目(2019JJ40128)。

摘　　要：为了高效处理地下水中的As(Ⅲ),设计了一种流通式电芬顿处理系统,考察了电流密度、pH、曝气速率、流速、电解质浓度以及共存离子等关键因素对As(Ⅲ)去除率的影响。此外,对电芬顿体系中As(Ⅲ)的去除机理进行了分析,并对该系统在连续运行下的处理效果进行了评估。结果表明:在最佳反应条件下(电流密度为7.6 mA·cm^(-2)、pH为6、流速为20 mL·min^(-1)、曝气速率为80 mL·min^(-1)、电解质浓度为100 mg·L^(-1)),地下水中As(Ⅲ)的去除率接近100%,该系统可以在近中性的pH范围内发挥作用;在连续运行条件下,该系统能够保持良好的处理稳定性;在电芬顿反应体系中,·OH和HO2·能够共同促进As(Ⅲ)的去除。水体中生成的As(Ⅴ)、Ni、Fe等能够在流通式系统中被过滤器有效地拦截,避免了二次污染的发生,污染水体得到净化。以上结果可为流通式电芬顿系统处理含As(Ⅲ)的地下水提供参考。In order to provide a new solution for the efficient removal of As(Ⅲ) in groundwater, a flow-through electro-Fenton system was proposed in this study. The effects of key factors such as current density, pH, aeration rate, flow rate, electrolyte concentration, and coexisting ions on the removal efficiency of As(Ⅲ) were investigated. In addition, the As(Ⅲ) removal mechanism by the electro-Fenton system was analyzed, and the treatment effect of this system under continuous operation conditions was evaluated. The results showed that the removal efficiency of As(Ⅲ) in groundwater could reach nearly 100% under optimum conditions(current density of 7.6 mA·cm^(-2), pH 6, flow rate of 20 mL·min^(-1), aeration rate of 80 mL/min, electrolyte concentration of 100 mg·L^(-1)). This system could have an important performance across a near-neutral pH range, and it could maintain good treatment stability under continuous running conditions. The mechanism studies indicated that·OH and HO_(2)· could promote As(Ⅲ) removal together by the electro-Fenton system. Moreover, the As(Ⅴ), Ni,Fe generated in this process could be effectively intercepted by the filter in the flow-through system, and the occurrence of secondary pollution was avoided, then the wastewater was purified. The above results could provide references for the efficient treatment of groundwater containing As(Ⅲ) by the flow-through electroFenton system.

关 键 词：地下水 As(Ⅲ) 流通式电芬顿 去除机理 连续运行 

分 类 号：X703[环境科学与工程—环境工程]