AWWA ACE68646

This powerpoint presentation presents three different project locations where issues with iron and manganese are not solved with traditional oxidation-adsorption or oxidation-precipitation- filtration treatment. The locations include: Arugum Bay Water Supply Project, Sri Lanka, US AID -- Sri Lanka Tsunami Reconstruction Program; Jefferson County, Washington, PUD No. 1 of Jefferson County -- Sparling Well WTP Upgrade; and, Fairbanks, Alaska, Alaska Department of Fish and Game -- Ruth Burnett Sport Fish Hatchery Influent Treatment. Project goals and concerns for each site are provided, along with biological treatment challenges, Pilot Testing Overview for individual sites, and cost savings. Presentation conclusions for biological iron and manganese filtration indicate that: it provides a cost effective alternative to traditional oxidation-adsorption or oxidation-precipitation- filtration treatment in systems with high iron and manganese levels; it greatly reduces the need for chemicals and operating costs; and, it provides a safe alternative in situations where chlorine exposure is not acceptable. Includes figures.