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Objective & Scope
1. Understand about biofilm 2. Evaluation of various supports for biofilter 3. Otimization of biofilter system Main Contents Although biofiltration is an emerging technology for VOC or odor control, it is now widely accepted as a low-cost, effective, reliable and environmentally benign technology. Toluene was chosen as a model VOC (volatile organic compounds) to be removed from the air. Granular Activated Carbon (GAC) was used as a filter medium in a packed bed type reactor. Two kinds of GAC with different origin and size were used in the experiment: wood-base Picabol (PICA, D=0.82mm) and coal-based GAC (Kuraray, D=4mm). Two lab scale biofilter systems packed with Picabiol were established and operated for 180 days. Water content in each column was differently controlled: supply of air prehumidified through bobble column (column 1) and direct water supply with mistifier (column 2). In addition, two more biofilter systems were established by packing larger size BAC (column 3 and 4) and operated for 90 days in order to study the effect of media size. Hydrogen sulfide is a highly odorous and toxic gas produced in wastewater collection and treatment facilities and in other industrial systems. Its release to the atmosphere brings odor complaints, and if it collects in confined spaces, it can be deadly. Under aerobic conditions, there are many species of organisms that can oxidize it to produce sulfuric acid. Conversion of the hydrogen sulfide to sulfuric acid removes it from the air, solving the odor problem. The solubility of hydrogen sulfide is high, and conversion rates are rapid. So biofilteration is an effective treatment process. We used a member of the autotrophic species, Thiobacillus thioparus, which was inoculated with activated carbon for biofilter system that controls hydrogen sulfide emission. The effect of operating parameters, including retention time, temperature, inlet gas concentration, on the removal efficiency and capacity was evaluated. Criteria necessary for a scale-up design of the biofilter are established by model. Four laboratory scale biofilters were continuously operated, which were packed with activated carbon, compost, polyurethane foam, and mixture of compost and polyurethane foam as the filter material. References 1) Treatment of volatile organic compounds using biolosical method Jae Hong Lim, Thesis of Master (1999), POSTECH, KOREA 2) Treatment of hydrogen sulfide using biofilter systems Jeong-Jin Park, Thesis of Master (2001), POSTECH, KOREA |
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