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Evidence for Anaerobic Dechlorination of Dechlorane Plus in Sewage Sludge

机译：污泥中余氯加氯的厌氧脱氯证据

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摘要

The environmental occurrence of dechlorination moieties from the high production volume flame retardant, Dechlorane Plus (DP), has largely been documented; however, the sources have yet to be well understood. In addition, few laboratory-based studies exist which identify the cause for the occurrence of these chemicals in the environment or humans. Anaerobic dechlorination of the two DP isomers was investigated using a laboratory-simulated wastewater treatment plant (WWTP) environment where anaerobic digestion is used as part of the treatment regime. Known amounts of each isomer were added separately to sewage sludge which provided the electron-donating substrate and at prescribed time points in the incubation, a portion of the media was removed and analyzed for DP and any dechlorination metabolites. After 7 days, monohydrodechlorinated products were observed for both the syn- and anti-DP which were continued throughout the duration of our study (49 days) in an increasing manner giving a calculated formation rate of 0.48 ± 0.09 and 0.79 ± 0.12 pmols/day for syn- and anti-DP, respectively. Furthermore, we observed a second monohydrodechlorinated product only in the anti-DP isomer incubation medium. This strongly suggests that anti-DP is more susceptible to anaerobic degradation than the syn isomer. We also provide compelling evidence to the location of chlorine loss in the dechlorination DP analogues. Finally, the dechlorination DP moieties formed in our study matched the retention times and identification of those observed in surficial sediment located downstream of the WWTP.
机译：高产量的阻燃剂Dechlorane Plus（DP）导致脱氯部分在环境中的发生已得到大量记录；但是，其来源尚待充分了解。另外，很少有基于实验室的研究能够确定这些化学物质在环境或人类中发生的原因。使用实验室模拟的废水处理厂（WWTP）环境研究了两种DP异构体的厌氧脱氯，其中厌氧消化用作处理方案的一部分。将已知量的每种异构体分别添加到污水污泥中，该污泥提供了给电子底物，并在培养中的指定时间点移出了一部分培养基，并分析了DP和任何脱氯代谢物。 7天后，观察到单氢脱氯产物的顺式-和反式-DP均以增加的方式持续在我们的研究过程中（49天），给出的形成速率为0.48±0.09和0.79±0.12 pmols /天。分别用于syn-DP和anti-DP。此外，我们仅在抗DP异构体温育培养基中观察到了第二种单氢脱氯产物。这有力地表明，抗-DP比顺式异构体更易于厌氧降解。我们还提供了令人信服的证据来证明脱氯DP类似物中氯损失的位置。最后，在我们的研究中形成的脱氯DP部分与保留时间匹配，并鉴定了位于污水处理厂下游表面沉积物中的那些。

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  • 来源
    《Environmental Science & Technology》 |2015年第23期|13862-13867|共6页
  • 作者

    Ed Sverko; Brian McCarry; Robert McCrindle; Allison Brazeau; Miren Pena-Abaurrea; Eric Reiner; Shirley Anne Smyth; Biban Gill; Gregg T. Tomy;

  • 作者单位

    Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario L8S 4M1, Canada,Water Science and Technology Directorate, Environment Canada, Burlington, Ontario L7R 4A6, Canada;

    Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario L8S 4M1, Canada;

    Wellington Laboratories, Guelph, Ontario N1G 3M5, Canada;

    Wellington Laboratories, Guelph, Ontario N1G 3M5, Canada;

    Ministry of the Environment, Toronto, Ontario M9P 3 V6, Canada;

    Ministry of the Environment, Toronto, Ontario M9P 3 V6, Canada;

    Water Science and Technology Directorate, Environment Canada, Burlington, Ontario L7R 4A6, Canada;

    Department of Biological Sciences, University of Toronto Scarborough Campus, Toronto, Ontario, M1C 1A4, Canada;

    Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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