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A biotrickling filter packed with 2.0″ polypropylene Tri-packs was used for testing the removal of isopropyl alcohol (IPA) in an air stream with relatively shorter empty bed residence time (EBRT) for the gas flowing through the packed section. Most of the influent IPA concentrations were controlled in the range of 6–333mg/m3 and EBRTs in 12.8–2.4s. Results indicate that with the operation conditions...