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Two-step pilot-scale biofilter system for the abatement of food waste composting emission
Galera, Melvin Maaliw,Cho, Eulsaeng,Kim, Yekyung,Farnazo, Danvir,Park, Shin-jung,Oh, Young-Sook,Park, Jae Kyu,Chung, Wook-Jin Taylor Francis 2008 Journal of Environmental Science and Health. Part Vol.43 No.4
<P> A pilot-scale two-step biofilter system was evaluated in treating food waste composting emission for 220 days. Wood chips were packed at the bottom section while mixture of rock wool and earthworm compost (6% w/v) was packed at the top section. Inlet ammonia concentration was found to be dominant and intermittent. The overall ammonia removal of over 98% was achieved, 70% of which was removed in the wood chip section. The highest ammonia elimination capacity was determined to be 39.43 g-NH3/m3/h at 99.5% removal efficiency. From biodegradation kinetic analysis, the maximum removal rate, Vm, of the wood chip section was determined to be 200 g-NH3/m3/h and the saturation constant, Ks, 180 mg/m3. For the rock wool-earthworm cast mixture section, the Vm was 87 g-NH3/m3/h and Ks was 87 mg/m3. Complete removal of hydrogen sulfide and most trace compounds were achieved by the biofilter. Highest hydrogen sulfide elimination rate was 0.22 g-H2S/m3/h. The biofilter was optimized from 24 to 16 s EBRT with resulting low average pressure drops of 16 and 29 mm H2O/m, respectively.</P>
Removal of NH3, H2S and Toluene by Biofilters Packed with Rock Wool-Compost Media
정욱진,Melvin Maaliw Galera,Eulsaeng Cho Enkhdul Tuuguu,Shin-Jung Park,Danvir Mark Farnazo,Chankyu Jee,Nam Jong Yoo 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.6
Biofiltration is carried out in packing materials where attached microorganisms degrade the passing contaminant. In this work, a new packing material was introduced and evaluated for the treatment of malodorous gases-ammonia and hydrogen sulfide and a volatile organic compound-toluene in three biofilters, BF1, BF2, and BF3, respectively. The new composite rock wool-compost media consisted of rock wool and compost in 70:30 weight ratios. Above 95 % removal efficiencies were obtained as the inlet concentrations of ammonia, hydrogen sulfide and toluene were increased up to 155, 150 and 260 ppmv, respectively in the biofilters at an empty bed residence time of ∼65 s. The removal efficiencies in the hydrogen sulfide (BF2) and toluene (BF3) biofilters immediately decreased when the frequency of water irrigation was reduced. However, hydrogen sulfide removal in the BF2 could be improved in some extent by maintaining pH of above 5. Parameters such as pH, microbial count, and pressure drop along the biofilters were also evaluated. The highest elimination capacities obtained from the study were 6.4 g-NH3/m3/h, 12.1 g-H2S/m3/h, and 57.6 g-toluene/m3/h, indicating that the rock wool-compost media can be suitably and effectively applied for biofiltration.