Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Substrate Interactions in the Biodegradation of Volatile Organic Compounds by a Yeast Strain

Yeast에 의한 휘발성 유기화합물 분해에 있어서의 기질상호관계 해석

  • 장현섭 (경희대학교 환경응용화학대학 및 환경연구센터) ;
  • 정미영 (경희대학교 환경응용화학대학 및 환경연구센터) ;
  • 신승규 (세종대학교 토목환경공학과) ;
  • 송지현 (세종대학교 토목환경공학과) ;
  • 황선진 (경희대학교 환경응용화학대학 및 환경연구센터)
  • Received : 2007.11.22
  • Accepted : 2007.12.06
  • Published : 2008.04.15
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Abstract

Biological removal capacities for volatile organic compounds (VOCs) were determined using a yeast strain, Candida tropicalis. In this study, VOCs including toluene, benzene, p-xylene, and styrene as single substrates or mixtures were tested in the batch culture of the yeast strain. In addition, a kinetic model was applied to evaluate substrate interactions between the VOCs. The yeast strain was able to biodegrade each VOC effectively as a growth substrate, implying it could applied to wide range of VOCs. When the yeast strain was subjected to VOCs in mixtures, the biodegradation rate of one substrate were either increased (stimulated) or decreased (inhibited) by the presence of the others. Both benzene and toluene were inhibited by the other VOCs, and substrate interaction parameters estimated in the model indicated that styrene was the strongest inhibitor for the benzene and toluene biodegradation. Meanwhile, the biodegradation of p-xylene and styrene was stimulated by the presence of either benzene or toluene. The biodegradation rate of p-xylene was significantly increased especially by the presence of toluene, and the styrene biodegradation was enhanced greatly by the benzene addition. The results of the substrate interaction by the yeast strain suggest that the biodegradation rates for the VOCs in mixtures should be carefully evaluated. Furthermore, the competitive inhibition coefficient could be applied as a useful index to determine the substrate interaction

Keywords

Acknowledgement

Supported by : 환경부

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