Abstract
Biological destruction of toluene vapor from air streams was studied in a laboratory scale biofilter. The packing material (peat) used in the reactor was immobilized with acclimatized bacterial suspension. The original microbial consortium was obtained as an activated sludge suspension from a local waste water treatment plant. The use of porous packing materials in biofilters may lead to considerable mixing of the gas phase. Since the performance of a reactor greatly depends on the mixing characteristics, a detailed analysis of the residence time distribution (RTD) was performed under abiotic conditions. The RTD results show that there is a significant amount of dispersion in the biofilter. An axial dispersion model has been developed and solved numerically using dispersion numbers obtained from RTD studies along with other model parameters. The predicted concentration profiles were in very good agreement with the experimental data.
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