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首页> 外文期刊>Biodegradation >Potential for aerobic and anaerobic biodegradation of petroleum hydrocarbons in boreal subsurface
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Potential for aerobic and anaerobic biodegradation of petroleum hydrocarbons in boreal subsurface

机译：地下石油气中好氧和厌氧生物降解的潜力

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摘要

We studied the role of aerobic and anaerobic petroleum hydrocarbon degradation at a boreal, light- weight fuel and lubrication oil contaminated site undergoing natural attenuation. At the site, anoxic conditions prevailed with high concentrations of CH4 ( up to 25% v/ v) and CO2 ( up to 18% v/ v) in the soil gas throughout the year. Subsurface samples were obtained mainly from the anoxic parts of the site and they represented both the unsaturated and saturated zone. The samples were incubated in microcosms at near in situ conditions ( i. e. in situ temperature 8degreesC, aerobic and anaerobic conditions, no nutrient amendments) resulting in the removal of mineral oil ( as determined by gas chromatography) aerobically as well as anaerobically. In the aerobic microcosms on average 31% and 27% of the initial mineral oil was removed during a 3- and 4- month incubation, respectively. In the anaerobic microcosms, on average 44% and 15% of the initial mineral oil was removed during a 12- and 10- month anaerobic incubation, respectively, and e. g. n- alkanes from C-11 to C-15 were removed. A methane production rate of up to 2.5 mug CH4 h(-1) g(-1) dwt was recorded in these microcosms. In the aerobic as well as anaerobic microcosms, typically 90% of the mineral oil degraded belonged to the mineral oil fraction that eluted from the gas chromatograph after C-10 and before C-15, while 10% belonged to the fraction that eluted after C-15 and before C-40. Our results suggest that anaerobic petroleum hydrocarbon degradation, including n- alkane degradation, under methanogenic conditions plays a significant role in the natural attenuation in boreal conditions.
机译：我们研究了需氧和厌氧石油烃降解在经历自然衰减的北方，轻质燃料和润滑油污染场所的作用。在该地点，一年四季土壤土壤气体中普遍存在高浓度的CH4（最高25％v / v）和CO2（最高18％v / v）缺氧条件。地下样品主要从该部位的缺氧部分获得，它们代表了不饱和带和饱和带。样品在接近原位条件（即原位温度8°C，需氧和厌氧条件下，无营养改良剂）的缩微温育下进行，从而有氧和厌氧地去除了矿物油（通过气相色谱法测定）。在有氧微观世界中，分别在3个月和4个月的孵育过程中平均分别去除了31％和27％的初始矿物油。在厌氧的微观世界中，分别在12个月和10个月的厌氧培养过程中（例如e）分别去除了初始矿物油的44％和15％。 G。除去了从C-11至C-15的正构烷烃。在这些微观世界中记录了高达2.5马克CH4 h（-1）g（-1）dwt的甲烷生产率。在好氧和厌氧的微观世界中，降解的矿物油中通常有90％属于C-10之后和C-15之前从气相色谱仪洗脱的矿物油馏分，而10％属于C以后洗脱的矿物油馏分。 -15和C-40之前。我们的结果表明，在产甲烷条件下厌氧石油烃的降解（包括正构烷烃的降解）在北方条件下的自然衰减中起着重要作用。

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