Journal
ENVIRONMENTAL POLLUTION
Volume 157, Issue 8-9, Pages 2197-2202Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.04.014
Keywords
Aerobic biodegradation; Bioaugmentation; Microbubble suspension; Oxygen-deficient; Saponin
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Funding
- Korea Science and Engineering Foundation (KOSEF)
- Korea government (MEST) [2009-0079618]
- Ministry of Land, Transport and Maritime Affairs
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This study investigated the ability of a saponin-based microbubble suspension to enhance aerobic biodegradation of phenanthrene by subsurface delivery. As the microbubble suspension flowed through a sand column pressure buildup and release was repeatedly observed, which delivered oxygen to the less permeable regions. Burkholderia cepacia RPH1, a phenanthrene-degrading bacterium, was mainly transported in a suspended form in the microbubble suspension. When three pore volumes of the microbubble suspension containing B. cepacia RPH1 was introduced into a column contaminated with phenanthrene (100 mg/kg), the oxygen content declined to 5% from an initial value of 20% within 5 days and correspondingly, 34.4% of initial phenanthrene was removed in 8 days. The addition of two further three pore volumes enhanced the biodegradation efficiency by a factor of 2.2. Our data suggest that a saponin-based microbubble suspension could be a potential carrier for enhancing the aerobic biodegradation under an oxygen-limiting environment. (C) 2009 Elsevier Ltd. All rights reserved
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