Citation:
Guo-Zhong WU, F. COULON, Yue-Wei YANG, Hong LI, Hong SUI, Combining Solvent Extraction and Bioremediation for Removing Weathered Petroleum from Contaminated Soil, Pedosphere, Vol. 23, Issue 4, August 2013, pages 455-463, ISSN 1002-0160, http://dx.doi.org/10.1016/S1002-0160(13)60038-7.
Abstract:
This study aimed to remediate a highly contaminated soil with weathered petroleum using an integrated technology combining solvent extraction and biodegradation. Soils were washed using a composite organic solvent consisted of hexane and pentane (4:1 v/v) and then bioremediated in microcosms which were bioaugmentated with Bacillus subtilis FQ06 strains and/or rhamnolipid. The optimal solvent extraction conditions were determined as extraction for 20 min at 25 °C with solvent-soil ratio of 6:1 (v/w). On this basis, total petroleum hydrocarbon was decreased from 140,000 to 14,000 mg kg-1, which was further reduced to < 4000 mg kg-1 by subsequent bioremediation for 132 days. Sustainability assessment of this integrated technology showed its good performance for both short- and long-term effectiveness. Overall results encouraged its application for remediating contaminated sites especially with high concentration weathered hydrocarbons.
