AWWA WQTC65954

This powerpoint presentation begins by listing the benefits of Multiple-microorganism Studies, and the Benefits of Single-site Studies. The Benefits of Multiple Coagulation Scheme Studies are listed, along with materials and methods that include: Microorganisms and surrogate; Assays performed; Experimental conditions; Operating conditions; and, Pilot-scale treatment plant details. Conclusions were that: "conventional" coagulation can produce orders of magnitude greater levels of removals for microorganisms than "direct filtration" coagulation; direct filtration is typically practiced on pristine source waters, which may not necessitate extremely high levels of microorganism removal; coagulant dose is a very important variable in determining particle removal in water treatment; microorganism removals can vary over 5 orders of magnitude depending on the coagulation conditions; virus and bacteria appeared to be more difficult than Cryptosporidium to remove in the present study; and, similar studies (multi-organism/multicoagulation scheme at a single site) could significantly improve our understanding of pathogen removal during water treatment. Includes figures.