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首页> 外文期刊>Environmental Geology >Intrinsic bioremediation of MTBE- contaminated groundwater at a petroleum-hydrocarbon spill site
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Intrinsic bioremediation of MTBE- contaminated groundwater at a petroleum-hydrocarbon spill site

机译：石油-碳氢化合物泄漏场的MTBE污染的地下水的本征生物修复

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An oil-refining plant site located in southern Taiwan has been identified as a petroleum-hydrocarbon [mainly methyl tert-butyl ether (MTBE) and benzene, toluene, ethylbenzene, and xylenes (BTEX)] spill site. In this study, groundwater samples collected from the site were analyzed to assess the occurrence of intrinsic MTBE bio-degradation. Microcosm experiments were conducted to evaluate the feasibility of biodegrading MTBE by indigenous microorganisms under aerobic, cometabolic, iron reducing, and methanogenic conditions. Results from the field investigation and microbial enumeration indicate that the intrinsic bio-degradation of MTBE and BTEX is occurring and causing the decrease in MTBE and BTEX concentrations. Microcosm results show that the indigenous microorganisms were able to biodegrade MTBE under aerobic conditions using MTBE as the sole primary substrate. The detected biodegradation byproduct, tri-butyl alcohol (TBA), can also be biodegraded by the indigenous microorganisms. In addition, microcosms with site groundwater as the medium solution show higher MTBE biodegradation rate. This indicates that the site groundwater might contain some trace minerals or organics, which could enhance the MTBE biodegradation. Results show that the addition of BTEX at low levels could also enhance the MTBE removal. No MTBE removal was detected in iron reducing and methanogenic microcosms. This might be due to the effects of low dissolved oxygen (approximately 0.3 mg/L) within the plume. The low iron reducers and methanogens (< 1.8x10~3 cell/g of soil) observed in the aquifer also indicate that the iron reduction and methanogenesis are not the dominant biodegradation patterns in the contaminant plume. Results from the microcosm study reveal that preliminary laboratory study is required to determine the appropriate substrates and oxidation-reduction conditions to enhance the biodegradation of MTBE. Results suggest that in situ or on-site aerobic bioremediation using indigenous microorganisms would be a feasible technology to clean up this MTBE-contaminated site.
机译：位于台湾南部的一家炼油厂场所已确定为石油-碳氢化合物[主要是甲基叔丁基醚（MTBE）和苯，甲苯，乙苯和二甲苯（BTEX）]的泄漏场所。在这项研究中，分析了从现场采集的地下水样品，以评估内在MTBE生物降解的发生。进行了微观实验，以评估在好氧，可代谢，铁还原和产甲烷条件下，本地微生物对MTBE进行生物降解的可行性。现场调查和微生物计数的结果表明，MTBE和BTEX发生了内在的生物降解，并导致MTBE和BTEX浓度降低。微观结果表明，使用MTBE作为唯一的主要底物，土著微生物能够在有氧条件下生物降解MTBE。检测到的生物降解副产物三丁醇（TBA）也可以被本地微生物生物降解。此外，以现场地下水为介质的微观世界显示出更高的MTBE生物降解率。这表明现场地下水中可能含有一些微量矿物质或有机物，这可能会提高MTBE的生物降解性。结果表明，少量添加BTEX也可以提高MTBE的去除率。在铁还原和产甲烷的微观世界中未检测到MTBE去除。这可能是由于羽流中的溶解氧低（约0.3 mg / L）所致。在含水层中观察到的低铁还原剂和产甲烷菌（<1.8x10〜3细胞/克土壤）还表明，铁还原和甲烷生成不是污染物羽流中主要的生物降解方式。微观研究的结果表明，需要进行初步的实验室研究以确定合适的底物和氧化还原条件，以增强MTBE的生物降解性。结果表明，使用本地微生物进行原位或现场需氧生物修复将是一种可行的技术，以清理受MTBE污染的站点。

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