Abstract
In this study, the effectiveness of subcritical water extraction (SCWE) was assessed by extracting four pesticides, namely diazinon, parathion, phenthoat, and EPN, from contaminated soil. The extraction efficiencies of different temperatures (25, 75, 100, 125, and 150 °C); times (10, 20, 30, and 40 min); pressures (1, 2, and 3 MPa); and water flow rates (0.5, 0.7, 1.0, and 1.5 mL/min) were investigated. The optimum temperature, time, pressure, and flow rate were found to be 150 °C, 20 min, 2 MPa, and 0.5 mL/min, respectively, in lab-scale. At this operating condition, the residual concentration of pesticide was less than 0.5 mg/kg, corresponding to an extraction efficiency of 99.9 %. The aim of this study was to also evaluate the removal efficiency on 30- and 167-fold scale-up extraction at optimum extraction condition obtained from lab-scale studies. The scale-up method considering constant ratio of the volume of water to soil mass was a feasible procedure. The results of our study suggest that SCWE is a promising option for effective disposal of pesticide-contaminated soil.
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Financial support for this research is gratefully acknowledged from Korea Environmental Industry and Technology Institute (KEITI) through the GAIA project (Grant No. 173-101-033).
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Islam, M.N., Jo, YT., Jung, SK. et al. Evaluation of Subcritical Water Extraction Process for Remediation of Pesticide-Contaminated Soil. Water Air Soil Pollut 224, 1652 (2013). https://doi.org/10.1007/s11270-013-1652-8
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DOI: https://doi.org/10.1007/s11270-013-1652-8