Dechlorination of trichloroethene in aqueous solution using Fe-O
Dechlorination of trichloroethene in aqueous solution using Fe-O
复制标题
DOI：
10.1021/es950053u
复制
发表时间：
1996-01-01
影响因子：
11.4
通讯作者：
Gillham, RW
中科院分区：
文献类型：
--
作者：
Orth, WS;Gillham, RW
采用流通柱试验研究了三氯乙烯水溶液与粒状铁金属接触时的降解产物。结果表明，TCE在1.3 ~ 61 mg/L范围内的降解过程为准一级反应，速率常数对TCE的初始浓度不敏感。主要的降解产物是乙烯，其次是乙烷和少量的其他C1-C4碳氢化合物。初始三氯乙烯中约有3.0-3.5%是氯化降解产物，包括三种二氯乙烯异构体和氯乙烯。虽然氯化物质量平衡通常在98%和102%之间，但在已鉴定的产品中最多可占73%的碳。基于溶液相中氯化降解产物的低浓度，建议大部分TCE保持吸附在铁表面，直到实现完全脱氯。
Flow-through column tests were conducted to investigate the products of degradation of aqueous trichloroethene (TCE) in contact with granular iron metal. The results indicated the degradation process to be pseudo-first-order and the rate constant to be relatively insensitive to the initial concentration of TCE over the range from about 1.3 to 61 mg/L. The principal degradation product was ethene, followed by ethane with substantially smaller amounts of other C1-C4 hydrocarbons. About 3.0-3.5% of the initial TCE appeared as chlorinated degradation products, including the three dichloroethene isomers and vinyl chloride. Although the chloride mass balance was generally between 98 and 102%, a maximum of 73% of the carbon could be accounted for in the identified products. Based on the low concentrations of chlorinated degradation products in the solution phase, it is proposed that most of the TCE remains sorbed to the iron surface until complete dechlorination is achieved.