内电解-芬顿氧化-絮凝组合工艺处理硝基苯废水  

Treatment of Nitrobenzene Wastewater by Internal Electrolysis-Fenton Oxidation-Flocculation Combined Process

作　　者：姚龙 石健[1] 李春建[1] 顾新忠 YAO Long;SHI Jian;LI Chunjian;GU Xinzhong(Center for Analysis and Testing,Nantong University,Nantong 226019,China)

机构地区：[1]南通大学分析测试中心,江苏南通226019

出　　处：《南通大学学报（自然科学版）》2019年第4期67-74,共8页Journal of Nantong University(Natural Science Edition)　

基　　金：国家自然科学基金项目(21177067)。

摘　　要：硝基苯作为一种典型硝基芳香族化合物(NACs),其对人类健康和生态环境具有极大的危害,因此探究硝基苯的高效降解方法具有重要意义。采用内电解-芬顿氧化-絮凝组合工艺处理硝基苯废水,探究镀铜率、反应时间、曝气量、pH及n(H2O2):n(Fe^2+)等参数对该组合工艺处理废水效果的影响,完成相关工艺参数条件优化,并揭示相关耦合机理。实验结果表明:在镀铜率为0.5%、曝气量为0.5 L/h、反应时间为6 h的条件下,初始质量浓度为50 mg/L的硝基苯可被铁铜内电解转化成苯胺,转化率为99.8%(±0.2%);芬顿氧化反应在n(H2O2):n(Fe^2+)=10:1、pH=3.0、ρ(Fe^2+)=60 mg/L的条件下,苯胺的去除率达到99.8%(±0.3%);絮凝沉淀反应中阴离子聚丙烯酰胺(PAM)的絮凝效果更好,当加入2 mL质量浓度为10 mg/L的阴离子PAM时,废水的色度为20倍,达到国家规定的一级排放标准。综上所述,该组合工艺在处理含硝基苯废水中具有较好的可行性,可为实现大规模化处理含高浓度NACs废水奠定基础。Nitrobenzene,as a typical nitroaromatic compounds(NACs),is a great harm to human health and ecological environment.Therefore,it is of great significance to explore the efficient degradation method of nitrobenzene.In this paper,the feasibility of the combined electrolysis-Fenton oxidation-flocculation system for the nitrobenzene-containing wastewater treatment is investigated,and effect of each copper plating rate,different aeration conditions,reaction time,pH,n(H2O2)∶n(Fe^2+)on removal rate of nitrobenzene,and the parameter of the process system is also optimized,and the related coupling mechanism is revealed.The experimental results show that nitrobenzene with an initial concentration of 50 mg/L can be converted into aniline by electrolysis reduction with a conversion rate 99.8%(±0.2%),and the copper plating rate,aeration rate and hydraulic retention time are found to be 0.5%,0.5 L/h and 6 h,respectively.Under the condition that the ratio of n(H2O2)∶n(Fe^2+)=10∶1,pH=3.0,ρ(Fe^2+)=60 mg/L,the removal rate of aniline by Fenton oxidation can be achieved at 99.8%(±0.3%).For flocculation precipitation process,the color of nitrobenzene-containing wastewater can be significantly reduced after addition of anion PAM.When 2 mL anion PAM with a concentration of 10 mg/L is added,the chroma of wastewater reduced to 20 times,reaching the national first-class emission standards.In summary,the combined process has good feasibility in the treatment of nitrobenzene-containing wastewater,and can lay a foundation for largescale treatment of wastewater containing high concentration of NACs.

关 键 词：硝基苯 内电解 芬顿氧化 絮凝 

分 类 号：X703.1[环境科学与工程—环境工程]