Moving away from chloramines while maintaining water quality

The Lake Murray Water Treatment Plant (LMWTP) in West Columbia, S.C., was dedicated in 1991 with a capacity of 6 million gal per day (mgd). With upgrades completed in 2007, the plant has a current capacity of 22.5 mgd. Most of the water from LMWTP is sold; 19% of the water is distributed to the system for which the LMWTP management and staff is responsible.

In the early 1990s, the water treatment plants in West Columbia began using chloramines as the primary disinfectant to control disinfection byproduct (DBP) concentrations in distribution. Chlorine gas was the source for the chlorine. In 2006, management at LMWTP was asked by the state regulatory agency to maintain a 30-day supply of chlorine on site. As a result, management decided to convert to a MIOX mixedoxidant solution (MOS) onsite generation (OSG) system. The OSG system uses only salt and power to generate a dilute chlorine-based solution, eliminating the storage and handling of hazardous disinfection chemicals.

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