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Transient Behaviors of a Two-Stage Biofilter Packed with Immobilized Microorganisms when Treating a Mixture of Odorous Compounds  

NamGung, Hyeong-Kyu (Department of Civil & Environmental Engineering, Sejong University)
Shin, Seung-Kyu (Department of Civil & Environmental Engineering, Sejong University)
Hwang, Sun-Jin (School of Architectural Civil & Environmental Engineering, Department of Environmental Science and Engineering, Center for Environmental Studies, Kyunghee University)
Song, Ji-Hyeon (Department of Civil & Environmental Engineering, Sejong University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.32, no.12, 2010 , pp. 1126-1133 More about this Journal
Abstract
A two-stage biofilter was constructed and utilized to determine the removal efficiency when treating dynamic loading of a mixture of odorous compounds including benzene, toluene, p-xylene, ammonia and hydrogen sulfide. A yeast strain, Candida tropicalis, and a sulfur oxidizing bacterial (SOB) strain, Acidithiobacillus caldus sp., were immobilized in polyurethane media and packed in the two-stage biofilter. The experiment of dynamic loading variation was composed of (1) stepwise loading variation of all the odorous compounds (total EC test), (2) stepwise loading variation of each odorous compound, and (3) intermittent loading variation with 2-day-off and 3-day-on. The total EC test showed that the maximum elimination capacity was $61\;g/m^3/hr$ for total VOCs, and 5.2 and $9.1\;g/m^3/hr$ for ammonia and hydrogen, respectively. In addition, the inhibition between VOCs was observed when the loading of each individual VOC was varied. Especially the stepwise increase in toluene loading resulted in decreases of benzene and p-xylene removal efficiencies about 30% and 25%, respectively. However, the inhibition between organic and inorganic compounds was not observed. The intermittent loading variation with 2-day-off and 3-day-on showed that greater than 95% of the overall removal efficiency was restored in two days after the loading resumed. Consequently, the two-stage biofilter packed with immobilized microorganisms showed advantages over conventional biofilters for the simultaneous treatment of the mixture of organic and inorganic odorous compounds.
Keywords
Yeast; SOB; Two-stage Biofilter; Dynamic Loading Variation; Immobilization;
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Times Cited By KSCI : 3  (Citation Analysis)
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