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Enhancement of anaerobic biodegradation of petroleum hydrocarbons in contaminated groundwater: Laboratory mesocosm studies.

机译：增强被污染的地下水中石油碳氢化合物的厌氧生物降解：实验室中观研究。

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摘要

This project was a part of a study to evaluate natural attenuation (NA) as a viable remedial option for petroleum hydrocarbon (PHC) contamination at upstream oil-and gas-contaminated sites in Alberta, Canada. Laboratory mesocosms were set up using groundwater and sediment materials collected from two PHC contaminated sites (Site 1 and Site 3) in Alberta to investigate the enhancement of anaerobic PHC biodegradation by amendment of terminal electraon acceptors (TEAs, nitrate or sulfate) and/or nutrients (ammonium and phosphate).;The calculated first-order biodegradation rates in Site 1 mesocosm study ranged from 0.0032 to 0.033 d-1 for benzene, 0 to 0.028 d -1 for ethylbenzene, 0.0021 to 0.036 d-1 for m-, p-xylenes, and 0.0006 to 0.0045 d-1 for F1-BEX (F1 hydrocarbons exclduding BEX) under the tested conditions. The laboratory first-order biodegradation rates of BEX were higher than the estimated field rates, indicating the potential of enhanced anaerobic biodegradation in situ. However, when comparing the TEA amended mesocosms with the unamended controls (in which iron reduction might be the predominant process), the enhancement effects were less apparent and inconsistent.;The calculated first-order biodegradation rates in Site 3 mesocosm study ranged from 0 to 0.0009 d-1 for benzene, 0 to 0.011 d -1 for ethylbenzene, 0 to 0.0016 d-1 for m- and p-xylenes, and 0 to 0.15 d-1 for o-xylene. Sulfate amendment significantly stimulated biodegradation of all xylenes and CCME F1 hydrocarbons. However, there was no definitive evidence that nitrate or sulfate amendment could enhance benzene or ethylbenzene biodegradation.;Multiple lines of evidence, including the removal of benzene, toluene, ethylbenzene and xylenes (BTEX) and CCME F1 fraction hydrocarbons (C 6 to C10), rapid depletion of TEAs, the production of biogenic gases, and detection of the metabolites verified that anaerobic PHC biodegradation was occurring in both laboratory mesocosm studies. Selective biodegradation of PHCs under different reducing conditions was observed. However, there was no conclusive evidence that one reducing condition will universally favor the biodegradation of specific PHCs. In both studies, nutrient amendment showed no enhancement effects.
机译：该项目是一项研究的一部分，旨在评估自然衰减（NA）作为加拿大艾伯塔省上游石油和天然气污染场所中石油碳氢化合物（PHC）污染的可行补救方案。使用从艾伯塔省两个PHC污染场所（站点1和站点3）收集的地下水和沉积物建立实验室中膜，以研究通过修饰末端电子受体（TEA，硝酸盐或硫酸盐）和/或养分来增强厌氧性PHC生物降解的能力。 （铵和磷酸盐）;;站点1中观研究中计算的一阶生物降解率范围为苯的0.0032至0.033 d-1，乙苯的0至0.028 d -1，m-，p的0.0021至0.036 d-1 -二甲苯，在测试条件下，对于F1-BEX（F1碳氢化合物不包括BEX）为0.0006至0.0045 d-1。 BEX的实验室一级生物降解速率高于估计的田间速率，表明潜在的原位厌氧生物降解能力增强。但是，当将TEA修正的中膜与未修正的对照（其中铁减少可能是主要过程）进行比较时，增强效果不太明显且不一致。; Site 3介膜研究中计算的一级生物降解率范围为0至苯为0.0009 d-1，乙苯为0至0.011 d -1，间二甲苯和对二甲苯为0至0.0016 d-1，邻二甲苯为0至0.15 d-1。硫酸盐改性剂显着促进了所有二甲苯和CCME F1烃类的生物降解。但是，没有确凿的证据表明硝酸盐或硫酸盐的改性剂可以促进苯或乙苯的生物降解。;多种证据，包括去除苯，甲苯，乙苯和二甲苯（BTEX）和CCME F1馏分碳氢化合物（C 6至C10） ，TEA的快速耗竭，生物气的产生以及代谢产物的检测证明，在两个实验室的中膜研究中均发生了厌氧性PHC生物降解。观察到在不同还原条件下PHCs的选择性生物降解。但是，没有确凿证据表明一种还原条件会普遍促进特定PHC的生物降解。在两项研究中，营养改良剂均未显示出增强作用。

著录项

  • 作者

    Fan, Xiaoying.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 289 p.
  • 总页数 289
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

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