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FURTHER EVALUATION OF TRICKLE BED BIOFILTER PERFORMANCE AS A FUNCTION OF LADING, RESIDENCE TIME, AND BIOMASS CONTROL
Citation:
Smith, F., G. Sorial, M. Suidan, A. Pandit, P. Biswas, AND R. Brenner. FURTHER EVALUATION OF TRICKLE BED BIOFILTER PERFORMANCE AS A FUNCTION OF LADING, RESIDENCE TIME, AND BIOMASS CONTROL. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-95/134 (NTIS PB96116926), 1995.
Description:
The 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. rickle bed air biofilters (TBABS) are especially applicable for treating VOCs at high loadings. or long term, stable operation of highly loaded TBABS, removal of excess accumulated biomass is essential. ur previous research demonstrated that suitable biomass control for TBABs was achievable by backwashing. ackwashing was performed by fluidizing the pelletized biological attachment media to about a 40% bed expansion. his paper presents an evaluation made of the impact of backwashing on the performance of four such highly loaded TBABS. he 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. or a toluene loading of 4.1 kg COD/m3 day it was demonstrated that the longterm performance of biofilters with either inlet concentration could be maintained at over 99.9'Yo by employing a strategy of backwashing for a duration of 1 hour every other day.
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FURTHER EVALUATION OF TRICKLE BED BIOFILTER PERFORMANCE AS A FUNCTION OF LADING, RESIDENCE TIME, AND BIOMASS CONTROL