Browsing by Author "Yang, Yuewei"

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    Combining solvent extraction and bioremediation for removing weathered petroleum from contaminated soil
    (Elsevier, 2013-08-31T00:00:00Z) Wu, Guozhong; Coulon, Frederic; Yang, Yuewei; Li, Hong; Sui, Hong
    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.
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    Pilot Application of SVE-Enhanced Bioremediation Technology for in situ Clean-up of a Light Oil-Contaminated Site
    (HARD Publishing; 1999, 2012-12-31T00:00:00Z) Yang, Yuewei; Wu, Guozhong; Li, Xingang; Coulon, Frederic; Li, Hong; Sui, Hong
    Light oil (isooctane) removal using soil vapor extraction (SVE) enhanced bioremediation (BR) was investigated by four steps, including: (i) amendment of substrates in batches (ii) continuous induction of contaminants for 15 days (iii) in situ acclimation for 100 days (iv) biodegradation assisted with SVE venting for 120 h at 20 m³·h-1 Results showed that the total removal efficiency was up to 90% after BR-SVE treatments. BR contributed predominantly to isooctane removal during the last 36 h of BR-SVE treatment. This implied that it would be an important strategy to limit water content at the early stage while increasing water supply at the end stage during implementation of BR-SVE, because water content was a significant factor hindering SVE but favoring BR. The overall results demonstrated a good complementarity between SVE and BR, and a potential for their combination in real-world applications.