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Anaerobic biotransformation of methyl tert-butyl ether (MTBE) and related fuel oxygenates under different anoxic conditions.

机译：在不同的缺氧条件下，甲基叔丁基醚（MTBE）和相关的燃料含氧化合物的厌氧生物转化。

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摘要

The fuel oxygenate methyl tert-butyl ether (MTBE) has been frequently detected in groundwater and surface water. Since contaminated sites are often subsurface, anaerobic degradation of MTBE will likely be significant for remediation. In this study, biodegradability of the fuel oxygenates MTBE, tert-amyl methyl ether (TAME), and ethyl tert-butyl ether (ETBE) was evaluated under different anoxic conditions. Anaerobic degradation of fuel oxygenates was observed in sediment microcosms from four different locations. After extended incubation and subculturing, stable microbial cultures that utilize MTBE and/or TAME under methanogenic and sulfate-reducing conditions were enriched. All cultures utilized both MTBE and TAME, regardless of their original substrate. No biotic loss of ETBE has been observed. Stoichiometric amounts of tert-butyl alcohol (TBA) and tert-amyl alcohol (TAA) accumulated, indicating that cleavage of the methyl group was the initial step in MTBE and TAME biotransformation. The inhibitory effect of alternative organic compounds on anaerobic degradation of MTBE varied depending on the type of compound and concentration. When methanogenesis or sulfate reduction was inhibited, the cultures continued to degrade MTBE, but a retardation of MTBE degradation was observed. The observation suggests that anaerobic MTBE degradation was not coupled directly to methanogenesis or sulfate reduction and the interactions among members of the MTBE-utilizing microbial community must be important for the overall degradation process. Carbon isotope fractionation during anaerobic biotransformation MTBE and TAME was examined. Significant enrichment of 13C in residual MTBE during anaerobic biotransformation was observed from different cultures under both sulfate-reducing and methanogenic conditions. Carbon enrichment factor (epsilon) values estimated for each enrichment are almost identical (-13.7‰ to -15.6‰), suggesting that environmental conditions may not be significantly influence carbon isotope fractionation during degradation. An (epsilon) value of -15.6 +/- 4.1‰ (R 2= 0.9690, n=55, 95% confidence interval) was obtained for anaerobic MTBE degradation from all data combined. An epsilon of -13.7 +/- 4.5‰ was obtained for anaerobic TAME degradation. The finding clearly demonstrates that carbon isotope fractionation has potential to be used as a tool to monitor in situ anaerobic MTBE and TAME biodegradation. As anaerobic degradation is likely to control the fate of MTBE and related fuel oxygenates, this study provides crucial information to understand the process as well as to appropriately manage MTBE-contaminated sites.
机译：经常在地下水和地表水中检测到燃料含氧化合物甲基叔丁基醚（MTBE）。由于受污染的地点通常位于地下，因此MTBE的厌氧降解可能对修复至关重要。在这项研究中，在不同的缺氧条件下评估了燃料氧化物MTBE，叔戊基甲基醚（TAME）和乙基叔丁基醚（ETBE）的生物降解性。在四个不同位置的沉积物微观世界中观察到燃料含氧化合物的厌氧降解。经过长时间的培养和传代培养后，在产甲烷和降低硫酸盐的条件下，利用MTBE和/或TAME的稳定微生物培养物得到了丰富。所有培养物均利用MTBE和TAME，而不论其原始底物如何。没有观察到ETBE的生物损失。化学计量的叔丁醇（TBA）和叔戊醇（TAA）的积累表明甲基的裂解是MTBE和TAME生物转化的第一步。替代有机化合物对MTBE厌氧降解的抑制作用因化合物的类型和浓度而异。当抑制甲烷生成或硫酸盐还原时，培养物继续降解MTBE，但观察到MTBE降解受阻。观察结果表明，厌氧MTBE降解并不直接与甲烷生成或硫酸盐还原有关，利用MTBE的微生物群落成员之间的相互作用对于整个降解过程至关重要。检查了厌氧生物转化过程中的碳同位素分馏MTBE和TAME。在硫酸盐还原和产甲烷条件下，从不同的培养物中观察到厌氧生物转化过程中残留MTBE中13C的大量富集。每次富集估算的碳富集因子（ε）值几乎相同（-13.7‰至-15.6‰），这表明环境条件可能不会显着影响降解过程中碳同位素的分馏。从组合的所有数据中得出，厌氧MTBE降解的（ε）值为-15.6 +/- 4.1‰（R 2 = 0.9690，n = 55，95％置信区间）。对于厌氧的TAME降解，获得了-13.7 +/- 4.5‰的ε。该发现清楚地表明，碳同位素分级分离有潜力用作监测原位厌氧MTBE和TAME生物降解的工具。由于厌氧降解很可能控制MTBE和相关燃料含氧化合物的命运，因此本研究提供了关键信息，以了解该过程以及适当管理受MTBE污染的场所。

著录项

  • 作者

    Somsamak, Piyapawn.;

  • 作者单位

    Rutgers The State University of New Jersey - New Brunswick.;

  • 授予单位 Rutgers The State University of New Jersey - New Brunswick.;
  • 学科 Environmental Sciences.; Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 166 p.
  • 总页数 166
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境科学基础理论;环境污染及其防治;
  • 关键词

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