Removal of Waterborne Bacteria Using an Antimicrobial Filter Media

Results of laboratory challenges and field demonstrations using an antimicrobial filtration technology are described. The innovative antimicrobial filtration media utilizes an EPAregistered antimicrobial agent that is permanently bound to a silica-based substrate. Waterborne bacteria are destroyed instantly on contact with the media without relying on physical trapping, chemical reaction, or the addition of waterborne chemical disinfectants. The media is neither consumed nor dispersed and leaves no in situ or downstream residue. Acute 48-hour toxicity tests, combined with NSF/ANSI 61 certification, show that potentially toxic chemicals do not leach from the filter media into the filtered waters. Laboratory efficacy challenges performed against E. coli, Legionella total aerobic bacteria, sulfate reducing bacteria, and iron fixing bacteria demonstrate efficacies of 92 to >99%. Case studies are described in association with cooling towers, stormwater treatment, and groundwater recovery to support the effective control and long-term suppression of harmful bacteria by the antimicrobial filter media.