Abstract
The aerobic biological oxidation of 2-propanol (isopropyl alcohol, IPA) at extremely high concentrations in air by an enriched solvent-tolerant microbial consortium operating at ambient temperature was evaluated for six months. Solventtolerant microbial cells were immobilised onto porous glass pall rings and fed with either IPA or its metabolic product acetone as sole carbon source. Successful biofiltration of solvent vapour at a concentration of 24 g m-3 was achieved with oxidation of up to 100% total inlet carbon. The maximum IPA mass loading and IPA elimination capacity (EC) was 1700 g m-3 h-1. This performance exceeds all previous values published in the literature for similar processes. A slip feed experiment, using acetone, was also performed in order to assess the substrate specificity performance. The biofilter responded successfully to a switch from acetone to IPA as sole carbon source, displaying little reduction in overall organic carbon removal.
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