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In Situ Biotreatment of TBA with Recirculation/Oxygenation

机译:循环氧合原位生物处理TBA

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摘要

The potential for in situ biodegradation of tert-butyl alcohol (TBA) by creation of aerobic conditions in the subsurface with recirculating well pairs was investigated in two field studies conducted at Vandenberg Air Force Base. In the first experiment, a single recirculating well pair with bromide tracer and oxygen amendment successfully delivered oxygen to the subsurface for 42 d. TBA concentrations were reduced from approximately 500 μg/L to below the detection limit within the treatment zone and the treated water was detected in a monitoring transect several meters downgradient. In the second experiment, a site-calibrated model was used to design a double recirculating well pair with oxygen amendment, which successfully delivered oxygen to the subsurface for 291 d and also decreased TBA concentrations to below the detection limit. Methylibium petro-leiphilum strain PM1, a known TBA-degrading bacterium, was detectable at the study site but addition of oxygen had little impact on the already low baseline population densities, suggesting that there was not enough carbon within the groundwater plume to support significant new growth in the PM1 population. Given favorable hydrogeologic and geochemical conditions, the use of recirculating well pairs to introduce dissolved oxygen into the subsurface is a viable method to stimulate in situ biodegradation of TBA or other aerobically degradable aquifer contaminants.
机译:在范登堡空军基地进行的两次野外研究中,研究了通过循环井对在地下产生好氧条件而导致叔丁醇(TBA)原位生物降解的可能性。在第一个实验中,具有溴化示踪剂和氧改良剂的单个循环井对成功地将氧气输送至地下达42 d。 TBA浓度从约500μg/ L降低到处理区内的检测极限以下,并且在下降几米的监测断面上检测到处理过的水。在第二个实验中,使用了经过现场校准的模型来设计带有氧气改良剂的双循环井对,该井对成功地将氧气输送至地下达291 d,并将TBA浓度降低至检测极限以下。在研究地点可检测到甲基溴化石油亲脂菌株PM1(一种已知的TBA降解细菌),但添加氧气对本已很低的基线种群密度影响很小,这表明地下水羽流中的碳含量不足,无法支撑重要的新细菌。 PM1人口增长。在有利的水文地质和地球化学条件下,使用循环井对将溶解的氧气引入地下是一种可行的方法,以刺激TBA或其他需氧降解的含水层污染物的原位生物降解。

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  • 来源
    《Ground Water Monitoring & Remediation》 |2012年第3期|p.52-62|共11页
  • 作者单位

    Chevron Energy Technology Company, 6001 Bollinger Canyon Road, San Ramon, CA 94583 She conducted this research as part of her M.S. in Hydrologic Sciences at the University of California. Davis. CA;

    Department of Land, Air and Water Resources, University of California, Davis,CA;

    M.S. in environmental engineering from the University of California, Davis, CA;

    Department of Land, Air and Water Resources, University of California, Davis, CA. He has a B.A. in geology and physics;

    Department of Civil and Environmental Engineering, University of California, Davis, CA;

    Department of Civil and Environmental Engineering, University of California, Davis, CA;

    Department of Land, Air and Water Resources, University of California, Davis, CA. He has an M.S. in microbiology from the University of California, Davis, CA;

    Department of Land, Air and Water Resources, University of California, Davis, CA;

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