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Electrokinetic remediation of petroleum hydrocarbon contaminated soil (I)
Environmental Technology & Innovation ( IF 7.1 ) Pub Date : 2021-04-27 , DOI: 10.1016/j.eti.2021.101585
Anish Saini , Dawit Nega Bekele , Sreenivasulu Chadalavada , Cheng Fang , Ravi Naidu

The remediation of petroleum hydrocarbons (TPH) in a contaminated soil by electrokinetic (EK) treatment was studied in the laboratory. The effects of applying a constant electrical current on soil pH, moisture content, electrical conductivity (EC), temperature, and the concentrations of three fractions of TPH (C10–C16, C17–C34 and C35–C40) were investigated. The experiment was run for seven days and soil samples were collected at the end of the 7 day period for analysis of soil pH and TPH concentration. There were extreme pH conditions near the electrodes. At the end of the experiment there was around a 37% reduction of C10–C16 chain compounds compared to the initial concentration of 164 ± 18 mg/kg. The study investigated TPH remediation to a depth of 24 cm, which is significantly more than most studies of EK remediation of TPH-contaminated soils. We observed reductions in TPH concentrations even at a depth of 24 cm. The spatial distribution of reductions in TPH concentrations was also studied and it was observed that more remediation occurred near the cathodes than near the anodes. Further, the greatest reductions in TPH concentrations were recorded near the electrodes in the lowest and middle parts of the experimental set-up. The application of electrokinetics to remediate TPH-contaminatedsoils could be a viable option as an in situ remediation technology.



中文翻译:

电动修复石油烃污染土壤(I)

在实验室中研究了通过电动(EK)处理对污染土壤中石油碳氢化合物(TPH)的修复。研究了施加恒定电流对土壤pH,水分,电导率(EC),温度和TPH的三个部分(C10–C16,C17–C34和C35–C40)的浓度的影响。实验进行了7天,并在7天结束时收集了土壤样品,以分析土壤的pH值和TPH浓度。电极附近存在极端的pH条件。在实验结束时,与初始浓度164±18 mg / kg相比,C10–C16链状化合物减少了约37%。该研究调查了TPH修复的深度为24 cm,这比大多数TPH污染土壤的EK修复研究要多得多。我们观察到即使在24 cm的深度,TPH浓度也会降低。还研究了TPH浓度降低的空间分布,并观察到阴极附近的修复量要比阳极附近的修复量大。此外,在实验装置的最低和中部,在电极附近记录了TPH浓度的最大降低。将电动学应用于修复受TPH污染的土壤可能是一个可行的选择。在实验装置的最低和中部,在电极附近记录到了TPH浓度的最大降低。将电动学应用于修复受TPH污染的土壤可能是一个可行的选择。在实验装置的最低和中部,在电极附近记录到了TPH浓度的最大降低。将电动学应用于修复受TPH污染的土壤可能是一个可行的选择。原位修复技术。

更新日期:2021-05-06
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