Treatment Of Benzene –Toluene Mixture In A Biofilter Using A Mixed Microbial Culture
Biofiltration of benzene-toluene gas mixtures was investigated in a biofilter operated in an up-flow mode using
mixed microbial cultures immobilized in a novel filter medium. The effect of inlet load of benzene-toluene mixtures on the
biodegradation performance of the biofilter was studied. The maximum elimination capacities of 162.08 g/m3
h for benzene
and 110.09 g/m3
h for toluene were obtained at a total inlet loading of 611.62 g/m3
h.Inhibition of toluene degradation by the
presence of benzene was observed in this study. The relationship between elimination capacity and inlet loading rate was
studied. The carbon dioxide gas production rate was recorded and related to elimination capacity. Temperature variations
during the biofiltration experiments were monitored. Axial variation of pollutant concentration in the biofilter bed was studied
and the lowest part of the biofilter column was found to remove approximately 40 % of the total removal which was due to
enhanced biomass density.
Keywords- Biofiltration, Removal Effeciency, Elimination Capacity, Volatile Organics.