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J Air Waste Manag Assoc


Title:Evaluation of trickle-bed air biofilter performance under periodic stressed operating conditions as a function of styrene loading
Author(s):Kim D; Cai Z; Sorial GA;
Address:"Department of Civil and Environmental Engineering at the University of Cincinnati, Cincinnati, OH 45221-0071, USA"
Journal Title:J Air Waste Manag Assoc
Year:2005
Volume:55
Issue:2
Page Number:200 - 209
DOI: 10.1080/10473289.2005.10464611
ISSN/ISBN:1096-2247 (Print) 1096-2247 (Linking)
Abstract:"Trickle-bed air biofilters (TBABs) are suitable for treating volatile organic compounds (VOCs) at a significantly high practical loading because of their controlled environmental conditions. The application of TBAB for treating styrene-contaminated air under periodic backwashing and cyclical nonuse periods at a styrene loading of 0.64-3.17 kg chemical oxygen demand (COD)/m3 x day was the main focus of this study. Consistent long-term efficient performance of TBAB strongly depended on biomass control. A periodic in situ upflow with nutrient solution under media fluidization, that is, backwashing, was approached in this study. Two different nonuse periods were employed to simulate a shutdown for equipment repair or during weekends and holidays. The first is a starvation period without styrene loading, and the second is a stagnant period, which reflects no flow passing through the biofilter. For styrene loadings up to 1.9 kg COD/m3 x day, removal efficiencies consistently above 99% were achieved by conducting a coordinated biomass control strategy, that is, backwashing for 1 hr once per week. Under cyclical nonuse periods for styrene loadings up to 1.27 kg COD/m3 x day, stable long-term performance of the biofilter was maintained at more than 99% removal without employing backwashing. No substantial impact of nonuse periods on the biofilter performance was revealed. However, a coordinated biomass control by backwashing subsequently was unavoidable for attaining consistently high removal efficiency at a styrene loading of 3.17 kg COD/m3 x day. As styrene loading was increased, reacclimation of the biofilter to reach the 99% removal efficiency following backwashing or the nonuse periods was delayed. After the non-use periods, the response of the biofilter was a strong function of the biomass in the bed. No significant difference between the effects of the two different nonuse periods on TBAB performance was observed during the study period"
Keywords:"Air Movements Air Pollution/*prevention & control Biodegradation, Environmental Biomass Filtration Kinetics Styrene/*isolation & purification Volatilization;"
Notes:"MedlineKim, Daekeun Cai, Zhangli Sorial, George A eng Evaluation Study Research Support, U.S. Gov't, Non-P.H.S. 2005/03/31 J Air Waste Manag Assoc. 2005 Feb; 55(2):200-9. doi: 10.1080/10473289.2005.10464611"

 
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