Selecting a Dechlorinating Chemical for a Wastewater Treatment Plant in Georgia
Kelley, Roy Thomas Jr.
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Wastewater treatment plants (WWTPs) that employ chlorine or chlorine dioxide for disinfection maintain a small total residual chlorine (TRC) in the plant effluent prior to discharging into receiving bodies of water. A TRC as low as 0.02 milligram per liter (mg/L) is toxic to aquatic life. The NPDES permits for WWTPs in Georgia are now being issued with a very low TRC limit, making it necessary to add a dechlorination step in such plants. The paper outlines an evaluation and comparison of available dechlorinating chemicals, demonstrates the cost analysis procedure and describes the influence of non-cost related aspects in the final selection of a chemical.