Abstract
The performance of the benzene microbial biofilter conducted under both continuous and transient operations. Mixed culture retrieved from the cow dung compost and inoculated within the biofilter. After the acclimatization period, it was studied continuously for 35 days at different empty bed residence times (EBRT) and up to the benzene concentration of 1.72 g m−3. Elimination capacity (EC) evaluated at different inlet loading rates (ILR) of benzene. The removal efficiency attained ranging from 37 to 84 %. Besides, the pressure drop increased during the biofiltration due to the accumulation of biomass on the packing. The restoration of biological activity observed within a few days of transient operation. The production of carbon dioxide (CO2) increased with the increasing elimination capacity during the degradation in the biofilter. However, the kinetics of biofilter was investigated using the macrokinetic method and application of the Michaelis-Menten model. Theoretical biofilm thickness in the biofilter was calculated to be 1.89 mm. ECmax and ks was found to be 0.2777 g m3 sec-1 and 0.008 g m−3 with R2 of 0.865.
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