Appiah Amirtharajah

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The extent to which drinking water turbidity measurements indicate the risk of gastrointestinal illness is not well understood. Despite major advances in drinking water treatment and delivery, infectious disease can still be transmitted through drinking water in the United States, and it is important to have reliable indicators of microbial water quality to(More)
We examined whether the average water residence time, the time it takes water to travel from the treatment plant to the user, for a zip code was related to the proportion of emergency department (ED) visits for gastrointestinal (GI) illness among residents of that zip code. Individual-level ED data were collected from all hospitals located in the(More)
The long-term performance of granular media filters used in drinking water treatment is ultimately limited by the efficiency of the backwash process. This paper demonstrates that it is possible to develop quantitative predictions of backwash efficiency based on filter operating conditions. An experimental investigation into the effect of backwash rate, type(More)
iological treatment is becoming an important tool for drinking water suppliers because of stricter regulation of disinfectants and disinfection by-products (DBPs). Whether designed primarily as a biological process or as an auxiliary unit operation in a conventional process (e.g., a rapid filter or a granular activated carbon [GAC] filter–adsorber),(More)
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