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J Hazard Mater

Title:		Biodegradation of toluene using Candida tropicalis immobilized on polymer matrices in fluidized bed bioreactors
Author(s):		Song J; Namgung H; Ahmed Z;
Address:		"Department of Civil and Environmental Engineering, Sejong University, Kwangjin-gu, Seoul, 143-747, South Korea"
Journal Title:		J Hazard Mater
Year:		2012
Volume:		20120928
Issue:
Page Number:		316 - 322
DOI:		10.1016/j.jhazmat.2012.09.049
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"A yeast strain, Candida tropicalis, was whole-cell-immobilized on polymer matrices of polyethylene glycol (PEG) and polyethylene glycol/activated carbon/alginate (PACA). The polymer matrices were used as fluidized materials in bubble-column bioreactors for the biodegradation of toluene. Simultaneously, another bubble-column bioreactor using granular activated carbon (GAC) and a conventional compost biofilter were operated for comparison. In the compost biofilter, the toluene removal efficiency gradually deteriorated due to the limitation of microbial activity. The toluene removal in the GAC bioreactor was relatively high because of an increase of toluene mass transfer. However, low toluene removal efficiencies were observed in the PEG bioreactor, presumably because the synthetic polymer alone was not suitable for yeast cell immobilization. In the PACA bioreactor, toluene removal was found to be greater than 95% overall. The CO(2) yield coefficient calculated at the highest toluene loading condition for the PACA bioreactor was found to be higher than those observed in the other bioreactors. Furthermore, almost complete elimination capacities were observed in the PACA bioreactor at short-term toluene loading up to 180 g/m(3)/h. In conclusion, the immobilization of C. tropicalis in the PACA matrix resulted in enhanced toluene biodegradation because of the increases of both mass transfer and microbial activity"
Keywords:		"Adsorption Alginates/chemistry Biodegradation, Environmental Bioreactors/*microbiology Candida tropicalis/*growth & development Cells, Immobilized Charcoal/chemistry Glucuronic Acid/chemistry Hexuronic Acids/chemistry Polyethylene Glycols/chemistry Polyme;"
Notes:		"MedlineSong, JiHyeon Namgung, HyeongKyu Ahmed, Zubair eng Research Support, Non-U.S. Gov't Netherlands 2012/10/17 J Hazard Mater. 2012 Nov 30; 241-242:316-22. doi: 10.1016/j.jhazmat.2012.09.049. Epub 2012 Sep 28"