Dechlorination of VC and cis-DCE by Reduced Iron Minerals Produced under Iron and Sulfate Reducing Conditions

CBET-0730064 Kim Hayes密歇根大学通过在铁和硫酸盐还原条件下产生的还原铁矿物对VC和cis-DCE进行脱氯本项目的目标是确定还原铁矿物和地球化学条件，以促进四氯乙烯（PCE）和三氯乙烯（TCE）脱氯途径中两种中间体的完全非生物还原脱氯：顺式二氯乙烯（cis-DCE）和氯乙烯（VC）。这些化合物比母体化合物毒性更大，在受污染的地下水中发现，主要是由于四氯乙烯和/或三氯乙烯的部分脱氯。该项目有三个目标：（1）在环境相关的还原条件下制备还原铁矿物的反应性纳米颗粒，（2）研究这些铁矿物还原VC和cis-DCE的速率和机制，以及（3）评估pH和NOM对这些矿物还原脱氯的影响。该提案解决了地下水补救中一个重要且尚未解决的问题;在美国，受四氯乙烯和三氯乙烯污染的地下水场地的补救仍然是一个主要的环境问题，该项目将提高我们对促进这些有毒化合物完全脱氯的条件的理解。

CBET-0730064Kim HayesUniversity of MichiganDechlorination of VC and cis-DCE by Reduced Iron Minerals Produced under Iron and Sulfate Reducing Conditions The goal of this project is to identify reduced iron minerals and geochemical conditions that promote complete abiotic reductive dechlorination of two intermediates in the dechlorination pathways of tetrachloroethylene (PCE) and trichloroethylene (TCE): cis-dichloroethylene (cis-DCE) and vinyl chloride (VC). Build-up of these compounds, which are more toxic than the parent compounds, has been found in contaminated ground water due (mainly) to partial dechlorination of PCE and/or TCE. The project has three objectives: (1) produce reactive nano-particles of reduced iron minerals under environmentally relevant reducing conditions, (2) investigate the rates and mechanisms of VC and cis-DCE reductive dechlorination by these iron minerals, and (3) evaluate the effects of pH and NOM on reductive dechlorination of the compounds by these minerals. The proposal addresses an important and unresolved problem in ground-water remediation; remediation of ground-water sites contaminated by PCE and TCE is still a major environmental problem in the United States, and the project will improve our understanding of the conditions that promote complete dechlorination of these toxic compounds.