Further evaluation of trickle bed biofilter performance as a function of loading, residence time, and biomass control
- Univ. of Cincinnati, OH (United States)
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. 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/m{sup 3} day it was demonstrated that the longterm performance of biofilters with either inlet concentration could be maintained at over 99.9% by employing a strategy of backwashing, for a duration of 1 hour every other day.
- OSTI ID:
- 416857
- Report Number(s):
- CONF-951023-; TRN: 96:005001-0014
- Resource Relation:
- Conference: 68. annual conference and exposition of the Water Environment Federation, Miami Beach, FL (United States), 21-25 Oct 1995; Other Information: PBD: 1996; Related Information: Is Part Of WEFTEC `95: 68th annual conference & exposition; PB: 498 p.
- Country of Publication:
- United States
- Language:
- English
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