Abstract

Abstract The City of Miramar, located in South Florida, has two water treatment plants which utilize two different water treatment processes. The East Water Treatment Plant (EWTP) uses lime softening, while the West Water Treatment Plant (WWTP) uses reverse osmosis treatment. Biscayne aquifer is used as the source water for both plants. Effectiveness of lime softening and reverse osmosis processes were evaluated in terms of trihalomethane (THM) levels in the distribution system with distance and at cul de sacs (dead end streets). The water treated by lime softening had significantly higher levels of THMs in comparison to the water treated by reverse osmosis. With the aging of reverse osmosis membranes (after 5 years), the THM levels exhibited similar levels in both distribution systems. The THM concentrations at the cul de sacs receiving water treated by lime softening were significantly higher in comparison to the system wide water quality. At the cul de sacs receiving water treated by reverse osmosis, T...

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