A laboratory scale biofilter system was used to eliminate toluene and ethanol, the main solvents employed in lacquering, from waste air. A specific micro-flora (mixture of Bacillus for ethanol and two pseudomonas species for toluene) able to degrade ethanol and toluene, was jimed on a packed bed of particles of commercial peat intermittently humidified by a nutrient solution necessary for the suroival of the micro-organisms.In the experiments, polluted gas was fed upwara3 through the bed and pbysical parameten: moisture content ofpat; humidity of aic temperature; pressure drop; inlevoutlet concentration of gas and microbialpopulation were measured regularly in order to check the performance of the biodegradation process.These experiments showed good pe~ormance and good stability of the biofilter over time.
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