Granular Activated Carbon (GAC) Columns Can Achieve Load Equalization for Biofilters Treating Gaseous Emissions from Wastewater Treatment Facilities
Abstract:Dynamically-varying contaminant concentrations pose a challenge in applying biofilters as an air pollution control technology. Recent research has demonstrated that for dry air streams, columns packed with granular activated carbon (GAC) can serve as passively-controlled load equalization devices as a pre-treatment step prior to contaminant destruction in a biofilter. Such systems can mitigate many adverse effects of unsteady-state loading. In research presented here, experiments were conducted to evaluate effects of relative humidity on degree of load equalization achieved by columns packed with Calgon BPL GAC. Toluene contaminated air was supplied 8 hr/day and uncontaminated air 16 hr/day to simulate an industrial process with discontinuous contaminant generation. Influent relative humidity ranged from <5% to 90%, and empty bed contact times (EBCTs) ranged from 1.5 to 10 seconds. Results demonstrate that appreciable load equalization can be accomplished at EBCTs as short as a few seconds even in presence of high relative humidity.
Document Type: Research Article
Publication date: January 1, 2008
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