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首页> 外文期刊>Environmental Science & Technology >Enhanced Reductive Dechlorination of Polychlorinated Biphenyl Impacted Sediment by Bioaugmentation with a Dehalorespiring Bacterium
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Enhanced Reductive Dechlorination of Polychlorinated Biphenyl Impacted Sediment by Bioaugmentation with a Dehalorespiring Bacterium

机译：脱卤呼吸细菌通过生物强化作用增强多氯联苯影响的沉积物的还原性脱氯。

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摘要

Anaerobic reductive dehalogenation of commercial PCBs such as Aroclor 1260 has a critical role of transforming highly chlorinated congeners to less chlorinated congeners that are then susceptible to aerobic degradation. The efficacy of bioaugmentation with the dehalorespiring bacterium Dehabbium chlorocoerda DF1 was tested in 2-L laboratory mesocosms containing sediment contaminated with weathered Aroclor 1260 (1.3 ppm) from Baltimore Harbor, MD. Total penta- and higher chlorinated PCBs decreased by approximately 56% (by mass) in bioaugmented mesocosms after 120 days compared with no activity observed in unamended controls. Bioaugmentation with DF-1 enhanced die dechlorination of doubly flanked chlorines and stimulated the dechlorination of single flanked chlorines as a result of an apparent synergistic effect on the indigenous population. Addition of granulated activated carbon had a slight stimulatory effect indicating that anaerobic reductive dechlorination of PCBs at low concentrations was not inhibited by a high background of inorganic carbon that could affect Hoavailability. The total number of dehalorespiring bacteria was reduced by approximately half after 60 days. However, a steady state level was maintained that was greater than the indigenous population of putative dehalorespiring bacteria in untreated sediments and DF1 was maintained within the indigenous population after 120 days. The results of this study demonstrate that bioaugmentation with dehalorespiring bacteria has a stimulatory effect on the dechlorination of weathered PCBs and supports the feasibility of using in situ bioaugmentation as an environmentally less invasive and lower cost alternate to dredging for treatment of PCB impacted sediments.
机译：商业PCB（例如Aroclor 1260）的厌氧还原性脱卤具有至关重要的作用，可将高度氯化的同类物转化为氯含量较低的同类物，然后再进行好氧降解。用去卤呼吸细菌Dehabbium chlorocoerda DF1进行生物增强的功效在含有升华的Aroclor 1260（1.3 ppm）污染的沉积物的2-L实验室中进行了测试，该沉积物来自马里兰州巴尔的摩港。与未经修饰的对照组相比，在120天后，经生物强化的中膜的五氯和更高氯含量的总PCB降低了约56％（质量）。 DF-1的生物强化作用增强了双侧氯的脱氯作用，并刺激了单侧氯的脱氯作用，这是对土著居民产生明显的协同作用的结果。颗粒状活性炭的添加具有轻微的刺激作用，表明低浓度的PCBs的厌氧还原性脱氯不受无机碳的高本底抑制，这可能会影响可利用率。 60天后，除呼吸道呼吸细菌的总数减少了大约一半。但是，维持的稳态水平要高于未经处理的沉积物中推定的除呼吸道呼吸细菌的本地种群，DF1在120天后仍保持在本地种群之内。这项研究的结果表明，用脱卤呼吸细菌进行生物强化对风化的多氯联苯的脱氯具有刺激作用，并支持使用原位生物强化作为无害环境且成本较低的替代挖泥法来处理受PCB影响的沉积物的可行性。

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  • 来源
    《Environmental Science & Technology》 |2011年第20期|p.8772-8779|共8页
  • 作者

    Rayford B. Payne; Harold D. May; Kevin R. Sowers;

  • 作者单位

    Department of Marine Biotechnology, Institute of Marine and Environmental Technology, University of Maryland Baltimore County,Baltimore, Maryland 21202;

    Marine Biomedicine and Environmental Science Center, Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, South Carolina 29425;

    Department of Marine Biotechnology, Institute of Marine and Environmental Technology, University of Maryland Baltimore County,Baltimore, Maryland 21202;

  • 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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