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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24121

Title: Impact of decreased NaCl concentration on halotolerant BTX-oxidizing cultures
Authors: C.H. Lin;C.Y. Lee
Contributors: NTOU:Department of Harbor and River Engineering
Keywords: Salinity;trickle-bed bioreactor;kinetics;maximum specific utilization rate;bacterial yield
Date: 2006-09
Issue Date: 2011-10-20T08:10:24Z
Publisher: Journal of Environmental Engineering and Management
Abstract: abstract:Halotolerant cultures might frequently encounter decreased salinity in a trickled-bed bioreactor (TBB) that has had implemented the practice of adding NaCl salt to inhibit the excessive growth of biomass. The purposes of this study were to evaluate the effects of decreased NaCl concentration on bacterial growth and substrate degradation, and to obtain kinetic information that would improve the design and operation of TBBs. Experiment work included cultivation of a mixed halotolerant culture in a chemostat reactor charged with an artificial saline influent containing 50 g L-1 NaCl and a mixture of benzene, toluene, and xylene (BTX), as well as the use of this enrichment culture to degrade in batch mode the individual BTX substrates under various NaCl salinities ranging from 50 to 0 g L-1. Measurements of biomass and residual substrate versus time were then analyzed using microbial kinetics. For the three substrates, as the salinity decreased from 50 to 0 NaCl g L-1, the observed bacterial yields appeared to be increased from 0.30-0.34 to 0.45-0.68 mg mg-1 and the maximum specific rate of substrate utilization increased from 0.13-0.21 to 0.20-0.33 h-1. The findings from this study suggest that a decrease in salinity can improve the substrate degradation rate while reducing the inhibition of biomass formation that is normally found in saline-water adapted cultures. These results will be useful and assist engineers when determining the optimal conditions for the addition of NaCl to a TBB.
Relation: 16(5), pp.303-308
URI: http://ntour.ntou.edu.tw/handle/987654321/24121
Appears in Collections:[河海工程學系] 期刊論文

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