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首页> 外文期刊>Journal of environmental science and health, Part A. Toxic/hazardous substances & environmental engineering >Distribution of ion contents and microorganisms during the electro-bioremediation of petroleum-contaminated saline soil
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Distribution of ion contents and microorganisms during the electro-bioremediation of petroleum-contaminated saline soil

机译：石油污染盐渍土电生物修复过程中离子含量和微生物的分布

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This study investigated the distribution of ion contents and microorganisms during the electro-bioremediation (EK-Bio) of petroleum-contaminated saline soil. The results showed that soil ions tend to accumulate around the electrodes, and the concentration was correlated with the distance from the electrodes. The average soil ion content was 7.92g/kg around the electrodes (site A) and 0.55g/kg at the furthest distance from the electrodes (site B) after 112days of treatment, while the initial average content was 3.92g/kg. Smooth linear (R-2 = 0.98) loss of soil ions was observed at site C, which was closer to the electrodes than site B, and had a final average soil ion content of 1.96g/kg. The dehydrogenase activity was much higher in EK-Bio test soil than in the Bio test soil after 28days of treatment, and followed the order: site C > site B > site A. However, the soil dehydrogenase activity dropped continuously when the soil ion reached very high and low concentrations at sites A and B. The soil microbial community varied in sample sites that had different ion contents, and the soil microbial diversity followed the order: site C > site B > site A. The applied electric field clearly enhanced the biodegradation efficiency for soil petroleum contaminants. However, the biodegradation promotion effects were weakening in soils where the ion contents were extremely high and low (sites A and B). These results can provide useful information for EK-Bioremediation of organic-contaminated saline soil.
机译：本研究考察了石油污染盐渍土电生物修复（EK-Bio）过程中离子含量和微生物的分布情况。结果表明：土壤离子倾向于在电极周围积聚，其浓度与电极的距离相关。处理112 d后，电极周围（位点A）的平均土壤离子含量为7.92g/kg，距离电极最远处（位点B）的平均土壤离子含量为0.55g/kg，初始平均含量为3.92g/kg。在比B位点更靠近电极的位点C处观察到土壤离子的平滑线性（R-2 = 0.98）损失，最终平均土壤离子含量为1.96g/kg。处理28 d后，EK-Bio试验土的脱氢酶活性远高于Bio试验土，并遵循以下顺序：位点C>位点B>位点A。然而，当土壤离子在A位点和B位点达到非常高和很低的浓度时，土壤脱氢酶活性持续下降。不同离子含量的样品点土壤微生物群落变化，土壤微生物多样性依次为：位点C>位点B>位点A。外加电场明显提高了土壤石油污染物的生物降解效率。然而，在离子含量极高和极低的土壤中，生物降解促进作用正在减弱（地点A和B）。研究结果可为有机污染盐渍土的EK-Bio修复提供参考。

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