A laboratory pilot study of thermal decontamination of soils polluted by PCBs. Comparison with thermogravimetric analysis |
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| Authors: | Risoul V Renauld V Trouvé G Gilot P |
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| Institution: | 1. Trédi, Département Recherche, Technopôle de Nancy-Brabois, BP 184-54505 Vandoeuvre les Nancy, France;2. Laboratoire Gestion des Risques et Environnement, Université de Haute Alsace, 25, rue de Chemnitz-68200 Mulhouse, France;1. Peter Cook Centre for CCS Research, The University of Melbourne, Melbourne, Parkville, Victoria 3010, Australia;2. CO2CRC ltd, level 1, 700 Swanston street, The University of Melbourne, Victoria 3010, Australia;1. Department of Civil Engineering, Architecture, Land and Environment, University of Brescia, Brescia, Italy;2. Department of Water Engineering, Faculty of Agriculture, University of Tabriz, Tabriz Iran;3. Department of Water Engineering, Faculty of Agriculture and Natural Resources, Urmia University, Urmia, Iran;4. University of St. Thomas, Minnesota, School of Engineering 2115 Summit Avenue St. Paul, MN 55105, USA;1. School of Resource and Environment Science, Wuhan University, Wuhan, 430072, PR China;2. Hubei Environmental Remediation Material Engineering Technology Research Center, Wuhan, 430072, PR China;1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;2. The Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China;3. Geotechnical and Environmental Research Group, Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK |
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| Abstract: | Real soils contaminated with a mixture of polychlorinated biphenyls were thermally decontaminated in a laboratory scale thermal desorption apparatus, under different operating conditions including two operating pressures (P= 0.01 and 0.1 MPa), different sample masses (80-320 g), carrier gas flow rates (0-30-280 Nl h(-1)) and two initial contamination levels. A standard European soil artificially contaminated with 4-chlorobiphenyl was decontaminated using a thermogravimetric analyser (TGA). The same parametric study as cited earlier was performed. With both techniques, the extent of decontamination was studied as a function of temperature during the heating programs (2-3 degrees C min(-1) for the thermal desorption apparatus; 5 degrees C min(-1) for TGA). Only a few differences were noticed between the two techniques. The decontamination starts when the melting temperature of the contaminant is reached (30 degrees C) and is complete before 350 degrees C. Thermogravimetric analysis which does not necessitate any chemical analysis appears to be a very attractive technique to investigate the feasibility of a decontamination and to quickly determine the best operating conditions. |
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