Enhanced Removal Efficiency of Malodorous Gases in a Pilot-Scale Peat Biofilter Inoculate with Thiobacillus thioparus DW44

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A newly isolated autotrophic bacterium, Thiobacillus thioparus DW44,which is capable of degrading sulfur-containing gases, was inoculated into a pilot-scale peat biofilter to treat the exhaust gas form a night soil treatment plant. Hydrogen sulfide (H_2S), methanethiol (MT), dimethyl sulfide (DMS) and dimethyl disulfide (DMDS) in the exhaust gas were efficiently removed for six months. Average removal ratios were 99.8% for H_2S, 99.0% for MT, 89.5% for DMS and 98.1% for DMDS at a space velocity of 46h^<-1> during the period of operation. No. acclimation period was needed to reach such a high efficiency in the removal of the gases, indicating that the ability of this bacterium to remove these gases was occurred immediately after its inoculation to the peat. Ammonia (NH_3) in the exhaust gas ws neutralized with SO_4^<2->, which is the final product of the oxidation of H_2S, MT, DMS and DMDS by the bacterium. No remarkable decline of pH, which often causes a deterioraiton in bacterial activity, was observed, mainly because of the reaction of SO_4^<2-> with NH_3. This study is the first report on the application of an isolated microorganism to a practical deodorizing system. The inoculation of T. thioparus DW44 into the pilot-scale peat biofilter could overcome such disadvantages of the conventional peat biofilter as a long acclimation period to reach a constant gas removability and the lowremovability of DMS, and resulted in enhanced removal efficiency of malodorus gases.
社団法人日本生物工学会の論文
1992-01-25

Enhanced Removal Efficiency of Malodorous Gases in a Pilot-Scale Peat Biofilter Inoculate with Thiobacillus thioparus DW44

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