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首页> 外文期刊>Journal of Hazardous Materials >Variability of soil potential for biodegradation of petroleum hydrocarbons in a heterogeneous subsurface
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Variability of soil potential for biodegradation of petroleum hydrocarbons in a heterogeneous subsurface

机译：土壤在非均质地下生物降解石油碳氢化合物的潜力

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摘要

Quantifying the spatial variability of factors affecting natural attenuation of hydrocarbons in the unsat-urated zone is important to (i) performing a reliable risk assessment and (ii) evaluating the possibility for bioremediation of petroleum-polluted sites. Most studies to date have focused on the shallow unsat-urated zone. Based on a data set comprising analysis of about 100 soil samples taken in a 16m-deep unsaturated zone polluted with volatile petroleum compounds, we statistically and geostatistically analysed values of essential soil properties. The subsurface of the site was highly layered, resulting in an accumulation of pollution within coarse sandy lenses. Air-filled porosity, readily available phosphorous, and the first-order rate constant (k_1) of benzene obtained from slurry biodegradation experiments were found to depend on geologic sample characterization (P＜0.05). while inorganic nitrogen was homoge-nously distributed across the soil stratigraphy. Semivariogram analysis showed a spatial continuity of 4-8.6 m in the vertical direction, while it was 2-5 times greater in the horizontal direction. Values of k_1 displayed strong spatial autocorrelation. Even so, the soil potential for biodegradation was highly variable, which from autoregressive state-space modeling was partly explained by changes in soil air-filled porosity and gravimetric water content. The results suggest considering biological heterogeneity when evaluating the fate of contaminants in the subsurface.
机译：量化影响未饱和饱和带中碳氢化合物自然衰减的因素的空间变异性对于（i）进行可靠的风险评估和（ii）评估石油污染场地的生物修复可能性很重要。迄今为止，大多数研究都集中在浅层未饱和带。基于一个数据集，该数据集包括分析在16m深的不饱和带中被挥发性石油化合物污染的约100个土壤样品的分析结果，我们对基本土壤性质的值进行了统计和地统计学分析。该部位的地下高度分层，导致在粗糙的沙质透镜内积累了污染。气孔孔隙率，易获得的磷以及通过浆液生物降解实验获得的苯的一级速率常数（k_1）取决于地质样品的表征（P ＜0.05）。而无机氮均匀地分布在整个土壤地层中。半变异函数分析显示，垂直方向的空间连续性为4-8.6 m，而水平方向的空间连续性为2-5倍。 k_1的值显示出很强的空间自相关。即便如此，土壤的生物降解潜力还是高度可变的，这通过自回归状态空间模型可以部分解释为土壤充气孔隙率和重量水含量的变化。结果建议在评估地下污染物的命运时考虑生物异质性。

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  • 来源
    《Journal of Hazardous Materials》 |2010年第3期|573-580|共8页
  • 作者

    Andreas H. Kristensen; Tjalfe G. Poulsen; Lars Mortensen; Per Moldrup;

  • 作者单位

    Aalborg University, Department of Biotechnology, Chemistry, and Environmental Engineering, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark Romboll Denmark A/S, Sonderbrogade 34, DK-7100 Vejle, Denmark;

    rnAalborg University, Department of Biotechnology, Chemistry, and Environmental Engineering, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark;

    Romboll Denmark A/S, Sonderbrogade 34, DK-7100 Vejle, Denmark;

    rnAalborg University, Department of Biotechnology, Chemistry, and Environmental Engineering, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    biological heterogeneity; petroleum vapors; spatial variability; semivariogram analysis; state-space modeling;

    机译：生物异质性石油蒸气;空间变异性半变异函数分析;状态空间建模;

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