【摘要】 通过批实验和柱实验研究了三氯乙烯(TCE)初始浓度、四氯乙烯(PCE)等对零价铁去除三氯乙烯的影响,并建立了三氯乙烯降解的反应动力学方程。结果表明:(1)零价铁对TCE具有较好的降解效果,反应符合准一级反应动力学方程,表观反应速率常数随TCE浓度的增加而减小;(2)在铁粉充足的条件下,TCE初始浓度对降解效果影响不显著,且TCE去除率皆可达到90%以上;(3)PCE的存在抑制了TCE的脱氯反应。PCE和TCE共存时,TCE的最大去除率仅为64.2%;TCE脱氯反应的表观反应速率明显降低,反应半衰期由TCE单独存在时的6.8～9.7 h增大到66 h～346.5 h。更多还原

【Abstract】 The impacts of the initial concentration of trichloroethylene(TCE) and the existence of perchloroethlyene(PCE) on TCE removal by zero valent iron and the reaction kinetics for TCE removal were investigated by batch and column experiments.The results indicate that:(1) TCE can be effectively degraded by zero valent iron and the reaction conforms to the pseudo first order reaction.The apparent reaction rate constant decreases with the increase of the concentration of TCE.(2) Under iron-sufficient conditions,the initial TCE concentration does not significantly alter the degradation rate of TCE and the TCE removal exceeds 90%.(3) The TCE’s dechlorination is inhibited by PCE.The TCE removal rate significantly is decreased by the co-existence of PCE and the maximum removal rate is 64.2%.Moreover,the apparent reaction rate obviously decreases and the half-life of the reaction increases from 6.8~9.7 hr by TCE alone to 66~346.5 hr.更多还原