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Enhanced toluene removal using granular activated carbon and a yeast strain candida tropicalis in bubble-column bioreactors

Ahmed, Zubair and Hwang, S. J. and Shin, S. K. and Song, J. (2010) Enhanced toluene removal using granular activated carbon and a yeast strain candida tropicalis in bubble-column bioreactors. Journal Of Hazardous Materials, 176 (13). 849 -855. ISSN 0304-3894

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Official URL: http://dx.doi.org/10.1016/j.jhazmat.2009.11.114

Abstract

The yeaststrainCandidatropicalis was used for the biodegradation of gaseous toluene. Toluene was effectively treated by a liquid culture of C. tropicalis in abubble-column bioreactor, and the tolueneremoval efficiency increased with decreasing gas flow rate. However, toluene mass transfer from the gas-to-liquid phase was a major limitation for the uptake of toluene by C. tropicalis. The tolueneremoval efficiency was enhanced when granularactivatedcarbon (GAC) was added as a fluidized material. The GAC fluidized bioreactor demonstrated tolueneremoval efficiencies ranging from 50 to 82% when the inlet toluene loading was varied between 13.1 and 26.9 g/m3/h. The yield value of C. tropicalis ranged from 0.11 to 0.21 g-biomass/g-toluene, which was substantially lower than yield values for bacteria reported in the literature. The maximum elimination capacity determined in the GAC fluidized bioreactor was 172 g/m3/h at atoluene loading of 291 g/m3/h. Transient loading experiments revealed that approximately 50% of the toluene introduced was initially adsorbed onto the GAC during an increased loading period, and then slowly desorbed and became available to the yeast culture. Hence, the fluidized GAC mediated in improving the gas-to-liquid mass transfer of toluene, resulting in a high tolueneremoval capacity. Consequently, the GAC bubble-column bioreactor using the culture of C. tropicalis can be successfully applied for the removal of gaseous toluene.

Item Type:Article
Uncontrolled Keywords:candidatropicalis, tolueneremoval, air stream, fluidized bioreactor, GAC
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Civil Engineering
ID Code:26143
Deposited By: Liza Porijo
Deposited On:27 Jun 2012 08:31
Last Modified:24 Aug 2014 08:22

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