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TRICKLE-BED BIOFILTERS FOR THE TREATMENT OF GAS PHASE POLLUTANTS
Makram T. Suidan 嶺南大學校 環境問題硏究所 1997 環境硏究 Vol.16 No.2
ABSTRACTThe 1990 Amendments to the Clean Air Act have stimulated strong interest in the use of biofiltration for the economical engineered control of VOCs in effluent air streams. Trickle bed air biofilters(TBABs) are especially applicable for treating VOCs at high loadings. For long term, stable operation of highly loaded TBABs, removal of excess accumulated biomass is essential. Our previous research demonstrated that suitable biomass control for TBABs was achievable by backwashing. Backwashing was performed by fluidizing the pelletized biological attachment media to about a 40% bed expansion. This paper presents an evaluation made of the impact of backwashing on the performance of four such highly loaded TBABs. The inlet VOC concentrations studied were 250 and 500 ppmv toluene, and the empty bed residence times (EBRTs) ranged from 0.67 to 2.0 minutes. For a toluene loading of 4.1 kg COD/m³day it was demonstrated that the longterm performance of biofilters with either inlet concentration coule be maintained at over 99.9% by employing a strategy of backwashing for a duration of 1 hour every other day.