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Toluene Removal and Microbial Growth of Candida tropicalis Immobilized with Polymer Media in Airlift Bioreactors  

Namgung, Hyeong-Kyu (세종대학교 토목환경공학과)
Song, JiHyeon (세종대학교 토목환경공학과)
Jung, Mi-Young (경희대학교 환경응용화학대학 환경공학전공)
Hwang, Sun-Jin (경희대학교 환경응용화학대학 환경공학전공)
Publication Information
Journal of Korean Society of Water and Wastewater / v.23, no.2, 2009 , pp. 175-180 More about this Journal
Abstract
This study was conducted to improve biological degradation efficiency of toluene as a model volatile organic compound (VOC) using yeast Candida tropicalis and to suggest an effective method for bioreactor operation. The yeast strain was immobilized with polyethylene glycol (PEG), alginate, and powdered activated carbon (PAC). The yeast-immobilized polymer media were used as fluidized materials in an airlift bioreactor. Polymer media without PAC were also made and operated in another airlift bioreactor. The two bioreactors showed toluene removal efficiencies ranging 80-96% at loading rates of $10-35 g/m^3-hr$, and the bioreactor containing the polymer media with PAC achieved higher removal efficiency. Protein contents in the liquid phase showed that the bioreactor using the yeast-immobilized polymer media with PAC had a higher rate of microbial growth initially than that without PAC. In addition, the microbial growth rate inside of the polymer media with PAC was five times higher than that without PAC. Consequently, the polymer media containing the yeast strain and PAC could enhance removal efficiencies for VOCs, and the immobilization method improve microbial activity and stability for a long-term operation of biological systems.
Keywords
immobilized polymer media; PAC; Candida tropicalis; VOCs; Airlift column bioreactor;
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Times Cited By KSCI : 4  (Citation Analysis)
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