Feasibility testing of biofiltration technology for remediating air contaminated by a boat manufacturing facility

This research investigated and compared the use of both bench- and pilot-scale biofilters to determine the effectiveness of controlling styrene, methyl ethyl ketone (MEK), and acetone emissions from an industrial gas waste stream. Critical operating parameters, including contaminant loading rate, temperature, and empty bed contact time, were manipulated in both the laboratory and field. At steady-state conditions, the bench and pilot-scale biofilters showed a 99% removal efficiency for styrene when the contaminant loading rate was less than 50 g m(-3)hr(-1) and 40 g m(-3)hr(-1), respectively. Although few data points were collected in the pilot-scale reactor where the styrene load was greater than 40 g m(-3)hr(-1), the total organic contaminant load including both MEK and acetone typically ranged between 50 g m(-3)hr(-1) and 80 g m(-3)hr(-1). Greater than 99% removal efficiencies were observed for acetone and MEK in the pilot-scale biofilter at all evaluated loading rates. Also studied were biofilter acclimation and re-acclimation periods. In inoculated bench and pilot biofilter systems, microbial acclimation to styrene was achieved in less than five days. In comparison, no MEK degrading microbial inoculum was added, so during the first months of pilot-scale biofilter operation, MEK removal efficiencies lagged behind those noted with styrene.