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首页> 外文期刊>Environmental Science & Technology >Bioremediation of groundwater contaminated with gasoline hydrocarbons and oxygenates using a membrane-based reactor
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Bioremediation of groundwater contaminated with gasoline hydrocarbons and oxygenates using a membrane-based reactor

机译：使用膜式反应器对被汽油碳氢化合物和含氧化合物污染的地下水进行生物修复

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The objective of this study was to operate a novel, field-scale, aerobic bioreactor and assess its performance in the ex situ treatment of groundwater contaminated with gasoline from a leaking underground storage tank in Pascoag, RI. The groundwater contained elevated concentrations of MTBE (methyl tert-butyl ether), TBA (tertbutyl alcohol), TBF (tert-but formate), BTEX (benzene, toluene, ethyl benzene, and xylene isomers), and other gasoline additives (tert-amyl methyl ether, di-isopropyl ether, tert-amyl alcohol, methanol, and acetone). The bioreactor was a gravity-flow membrane-based system called a Biomass Concentrator Reactor (BCR) designed to retain all biomass within the reactor. It was operated for six months at an influent flow rate that ultimately reached 5 gpm. The goal was to achieve a removal of all contaminants to < 5 mu g/L, which is the California Drinking Water advisory for MTBE. The concentration of TBA, an MTBE biodegradation byproduct, was consistently lower than that of MTBE. The other daughter compound detected in the influent, TBF, was degraded to concentrations below the detection limit of 0.02 mu g/L. BTEX were consistently degraded to significantly lower levels in the effluent throughout the duration of the study (< 1 mu g/L). A similar high removal efficiency of the other gasoline oxygenates present in the groundwater (TAME, DIPE, and TAA) was also achieved. Dissolved organic carbon analysis demonstrated the ability of the bioreactor to produce high quality effluents with nonpurgeable organic carbon (NPOC) averaging approximately 50% lower than the NPOC concentrations in the influent contaminated groundwater.
机译：这项研究的目的是操作一种新型的，现场规模的好氧生物反应器，并评估其在从RI的Pascoag泄漏的地下储罐中对汽油污染的地下水进行异地处理的性能。地下水含有较高浓度的MTBE（甲基叔丁基醚），TBA（叔丁醇），TBF（叔丁酸酯），BTEX（苯，甲苯，乙苯和二甲苯异构体）和其他汽油添加剂（叔丁基戊基甲基醚，二异丙基醚，叔戊醇，甲醇和丙酮）。生物反应器是一种基于重力流膜的系统，称为生物质浓缩器反应器（BCR），旨在将所有生物质保留在反应器中。它以进水流速运行了六个月，最终达到5 gpm。目标是将所有污染物的去除量降至<5μg / L，这是加州MTBE饮用水咨询。 MTBE生物降解副产物TBA的浓度始终低于MTBE。进水中检测到的另一种子代化合物TBF降解至低于0.02μg / L的检测限以下的浓度。在整个研究过程中，废水中的BTEX一直被降解至明显较低的水平（<1μg / L）。还实现了地下水中其他汽油含氧化合物（TAME，DIPE和TAA）的类似高去除效率。溶解有机碳分析表明，生物反应器具有产生高质量污水的能力，其中不可净化有机碳（NPOC）平均比污水中被污染的地下水的NPOC浓度低约50％。

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