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首页> 外文期刊>Environmental toxicology and chemistry >Effects of surfactants on the dechlorination of chlorinated ethenes.
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Effects of surfactants on the dechlorination of chlorinated ethenes.

机译：表面活性剂对氯化乙烯脱氯的影响。

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The influence of surfactants on a perchloroethene (PCE) dechlorinating mixed culture was investigated in laboratory experiments. Surfactants (Steol CS-330, Aerosol MA 80-I, alpha olefin sulfonate 14 to 16, Neodol 25-7, Tween 80, alkyl polyglycoside, C16TAB [trimethylammonium bromide], and sodium dodecyl sulfate) were evaluated for their effects on the rate and extent of PCE reductive dechlorination and their potential biodegradation by the mixed culture. Limited, if any, surfactant biodegradation was observed for the surfactants tested, and all surfactants impaired dechlorination in either the rate of PCE dechlorination or the terminal dechlorination products observed. Based on initial testing, a nonionic surfactant, Tween 80, and an anionic surfactant, Steol CS-330, were selected for additional investigation. Dechlorination of PCE to dichloroethene (DCE), vinyl chloride (VC), and ethene (ETH) occurred in all Tween 80-amended microcosms, with a depressed rate of ETH production as the only adverse effect. Steol CS-330, however, inhibited dechlorination beyond DCE at all surfactant concentrations exceeding 25 mg/L. Attempts to acclimate a culture to Steol CS-330 were unsuccessful. Inhibition of VC and ETH production was reversible on dilution of the surfactant to a concentration of 10 mg/L or less, indicating that surfactant interactions with the enzyme system responsible for reductive dechlorination of DCE may be the cause of inhibition.
机译：在实验室实验中研究了表面活性剂对全氯乙烯（PCE）脱氯混合培养物的影响。评估了表面活性剂（Steol CS-330，Aerosol MA 80-I，α-烯烃磺酸盐14至16，Neodol 25-7，吐温80，烷基多糖苷，C16TAB [三甲基溴化铵]和十二烷基硫酸钠）对它们的影响。混合培养中PCE还原脱氯的程度，程度及其潜在的生物降解作用。对于所测试的表面活性剂，观察到有限的表面活性剂生物降解，并且所有表面活性剂均以观察到的PCE脱氯速率或最终脱氯产物损害了脱氯能力。根据初步测试，选择了非离子表面活性剂Tween 80和阴离子表面活性剂Steol CS-330进行进一步研究。在所有吐温80修正的缩影中都发生了PCE脱氯为二氯乙烯（DCE），氯乙烯（VC）和乙烯（ETH）的情况，唯一的不利影响是降低了ETH的产生率。然而，在所有超过25 mg / L的表面活性剂浓度下，Steol CS-330均能抑制DCE以外的脱氯作用。尝试使文化适应Steol CS-330失败。稀释表面活性剂至浓度为10 mg / L或更低时，对VC和ETH产生的抑制作用是可逆的，这表明表面活性剂与负责DCE还原脱氯的酶体系的相互作用可能是抑制作用的原因。

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