阻挡放电光催化净化低浓度含H_2S废气试验研究  

Research on decontamination of low concentration hydrogen sulfide using dielectric barrier discharge combined with photocatalyst

作　　者：党小庆[1] 陈磊[1] 黄家玉[1] 刘晓[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《安全与环境学报》2011年第2期40-42,共3页Journal of Safety and Environment

基　　金：陕西省教育厅2009年度科学研究计划项目(09JK513)

摘　　要：采用介质阻挡放电光催化方法对低浓度含H2S废气进行试验研究。正交试验结果表明,外加电压对H_2S去除率的影响最为显著,其次为初始浓度以及模拟废气停留时间。H_2S去除率随外加电压的上升而升高,随初始浓度的增大而降低,随模拟废气停留时间的增长而升高。填料表面负载纳米Ti0_2光催化剂可有效提高H_2S去除率,在外加电压达到22 kV时,有光催化剂比无光催化剂时去除率提高11.9%。研究表明:介质阻挡放电协同光催化净化低浓度含H_2S废气能达到85%以上的去除率,且不易产生二次污染。In this paper, the decontamination of low concentration malodorous waste gas by using dielectrical barrier discharge combined with nanometer sized TiO2 photocatalyst have been investigated. In this study, H2S was selected as target and the main factors such as applied voltage, retention time and the initial concentration of waste gas which remarkably affect the removal rate were investigated. Some other factors such as the application of nanometer sized TiO2 photoca- talyst was also studied as well. The main results indicated that： （1） the significance order of these factors could be arranged as applied voltage〉initial concentration〉retention time of waste gas. （2） In the case where other conditions remain unchanged, the removal rate of H2S increased with the increase of voltage and gas retention time, but decreased with the increase of initial concentration. When the initial concentration was about 400 mg/m^3, Q=100 L/h （retention time=23 s）, RH=10% and the voltage came up to 22 kV, the removal rate was 75%. The removal rate was three times higher than condition where voltage was 12 kV. When the initial concentration was about 400 mg/m^3, voltage was 22 kV, Q=100 L/h （retention time =23 s） and RH=10%, the removal rate can reach 85%. In the case of 400 mg/m^3 initial concentration and voltage=22 kV, the removal rate has slowly increased with the extent of retention time. （3） The removal rate of H2S was significantly improved with the aid of nanometer sized TiO2 photo-catalyst where the removal rate was enhanced by about 11.9% when the applied voltage was 22 kV. The results have shown that the removal rate of H2S can achieve more than 85% by integrating photocatalytic technology into the process of decontamination of low concentration waste gas using dielectric barrier discharge. In addition, this method is capable to reduce energy consumption and secondary pollution as well.

关 键 词：环境工程学 介质阻挡放电 光催化 H2S 去除率 

分 类 号：X512[环境科学与工程—环境工程]