Fenton试剂快速氧化处理事故场地地下水中的硝基苯

为了得到事故场地硝基苯(NB)污染地下水的应急处理方案,通过静态实验研究了地下水中初始NB浓度为100 mg·L-1和300 mg·L-1,pH值为3时,H2O2与NB质量比p、H2O2与Fe(Ⅱ)质量比q对氧化效果的影响。结果表明:当q为20,p为1~6时,NB降解率和降解速率随p的增大而增大;当p为3,q为5~20时,NB降解速率随q的增大而减小。根据氧化处理后水中B/C值判断,当p大于2时,出水可排入污水生物处理系统进行后续处理。动力学分析表明,p、q值与NB降解的伪一阶反应速率常数k0存在较强的线性关系,R2 > 0.95,p的影响程度大于q。根据事故场地NB污染地下水快速处理所要求的NB的去除率和去除时间,给出了高浓度NB污染地下水处理适宜的Fenton投加方案。

Rapid oxidation of nitrobenzene in groundwater of environmental accident sites by Fenton

Fenton was prepared to treat nitrobenzene(NB) at 100 mg·L-1 and 300 mg·L-1 in groundwater by static experiments,at pH of 3.For the emergency treatment of NB-contaminated groundwater at an environmental accident site,the influence of p(mass ratio of H2O2 and NB) and q(mass ratio of H2O2 and Fe(II)) on the NB treatment effect was studied.The degradation efficiency and degradation rate of NB increased with the increase of p(1≤p≤6),while for q it was 20.The degradation rate of NB decreased with the increase of q(5≤q≤20),while for p was 3.The B/C of the treated groundwater indicated that the water could be discharged into the biological wastewater treatment system for post-treatment when p was larger than 2.Kinetic analysis showed a strong linear relationship between p,q,and k0,the pseudo-first-order reaction rate constant of NB degradation.Furthermore,the influence of p on k0 was larger than that of q on k0.Suitable Fenton treatment for high concentrations of NB-contaminated groundwater could be suggested,according to the requested degradation efficiency and the degradation rate of NB for the rapid treatment of NB-contaminated groundwater at an environmental accident site.