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KMID : 0545120070170020320
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Journal of Microbiology and Biotechnology
2007 Volume.17 No. 2 p.320 ~ p.324
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Hydrogen Sulfide Removal by Immobilized Thiobacillus novellus on SiO2 in a Fluidized Bed Reactor
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Cha Jin-Myung
Shin Hyun-Jae
Roh Sung-Hee
Kim Sun-Il
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Abstract
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The removal of hydrogen sulfide (H2S) from aqueous media was investigated using Thiobacillus novellus cells immobilized on a SiO2 carrier (biosand). The optimal growth conditions for the bacterial strain were 30oC and initial pH of 7.0. The main product of hydrogen sulfide oxidation by T. novellus was identified as the sulfate ion. A removal efficiency of 98% was maintained in the three-phase fluidized-bed reactor, whereas the efficiency was reduced to 90% for the two-phase fluidized-bed reactor and 68% for the two-phase reactor without cells. The maximum gas removal capacity for the system was 254 g H2S/m3/h when the inlet H2S loading was 300 g/m3/h (1,500 ppm). Stable operation of the immobilized reactor was possible for 20 days with the inlet H2S concentration held to 1,100 ppm. The fluidized bed bioreactor appeared to be an effective means for controlling hydrogen sulfide emissions
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KEYWORD
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Thiobacillus novellas, hydrogen sulfide, immobilized cells, SiO2, biosand, fluidized-bed bioreactor
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