Hot water extraction with in situ wet oxidation: kinetics of PAHs removal from soil

Journal of Hazardous Materials
Ali A Dadkhah, Aydin Akgerman

Abstract

Finding environmentally friendly and cost-effective methods to remediate soils contaminated with polycyclic aromatic hydrocarbons (PAHs) is currently a major concern of researchers. In this study, a series of small-scale semi-continuous extractions--with and without in situ wet oxidation--were performed on soils polluted with PAHs, using subcritical water (i.e. liquid water at high temperatures and pressures, but below the critical point) as the removal agent. Experiments were performed in a 300 mL reactor using an aged soil sample. To find the desorption isotherms and oxidation reaction rates, semi-continuous experiments with residence times of 1 and 2 h were performed using aged soil at 250 degrees C and hydrogen peroxide as oxidizing agent. In all combined extraction and oxidation flow experiments, PAHs in the remaining soil after the experiments were almost undetectable. In combined extraction and oxidation no PAHs could be detected in the liquid phase after the first 30 min of the experiments. Based on these results, extraction with hot water, if combined with oxidation, should reduce the cost of remediation and can be used as a feasible alternative technique for remediating contaminated soils and sediments.

References

Jun 8, 2002·Bulletin of Environmental Contamination and Toxicology·S Y YuanB V Chang
Jun 13, 2002·Environmental Health Perspectives·Carl-Elis BoströmRoger Westerholm
Jul 26, 2002·Journal of Hazardous Materials·Ali A Dadkhah, Aydin Akgerman

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Citations

Mar 28, 2013·Environmental Technology·Edward Nixon PakpahanWan Wiriya
May 11, 2013·Journal of Contaminant Hydrology·Kanwartej S SraJim F Barker
Aug 25, 2009·Journal of Hazardous Materials·S GanH K Ng
Oct 22, 2008·Analytical and Bioanalytical Chemistry·C NerínR Batlle
Jul 1, 2016·Biological Research for Nursing·Maryam AminiMahdieh Nourmohammadi

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