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Effect of ethanol and biodiesel addition on the movement and biodegradation of volatile petroleum hydrocarbons in the subsurface

机译：乙醇和生物柴油添加对地下挥发性石油烃运移和生物降解的影响

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摘要

The microbial degradation of typical volatile petroleum hydrocarbons in an aerobic sandy soil was studied with and without the blending of 10 percent ethanol (E10) or 20 percent biodiesel (B20) in batch microcosms and minilysimeters. In the head-space of the mini-lysimeters all volatile compounds remained above the analytical detection limits over 92 days except toluene in the pure petroleum hydrocarbon mixture (PP) and ethanol in E10. The mass percentage of each petroleum hydrocarbon compound remaining at the end of the experiments was comparable for all fuel mixtures, except for m-xylene, which was significantly less reduced in E10 as compared to PP and B20. Total cell counts at the end of the experiments were highest for E10 and lowest for PP. DGGE analysis revealed a distinct microbial community structure for each fuel mixture. Batch studies confirmed these observations, in particular slower degradation of toluene in the presence of ethanol. Inorganic nutrient addition to the batch systems resulted in higher total cell counts, more rapid microbial degradation rates and more similar microbial community structures. Under aerobic conditions, competition for scare inorganic nutrients seems to be the most plausible reason for slower monoaromatic hydrocarbon biodegradation in the presence of more readily degradable biofuel.
机译：研究了在好坏的沙质土壤中典型挥发性石油烃的微生物降解情况，在批次微观和微量测微法中，是否添加了10％的乙醇（E10）或20％的生物柴油（B20）。在微型测微仪的顶部空间中，除纯石油烃混合物（PP）中的甲苯和E10中的乙醇外，所有挥发性化合物在92天之内都保持在分析检测极限之上。在实验结束时剩余的每种石油烃化合物的质量百分比对所有燃料混合物都是可比的，除了间二甲苯，与PP和B20相比，E10中的二甲苯的减少量明显更少。实验结束时，总细胞数对E10最高，对PP最低。 DGGE分析显示每种燃料混合物都有独特的微生物群落结构。批处理研究证实了这些观察结果，特别是在乙醇存在下甲苯的降解较慢。批处理系统中添加的无机营养物导致更高的总细胞数，更快的微生物降解速率和更相似的微生物群落结构。在有氧条件下，竞争激烈的无机养分似乎是存在更易降解的生物燃料时单芳烃生物降解较慢的最合理的原因。

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    Ali Abdulmagid Elazhari M;

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  • 年度 2011
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  • 正文语种 English
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