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AWWA ACE94158
- Effects of Enhanced Coagulation on Halogenated Disinfection Byproduct Formation Potentials
- Conference Proceeding by American Water Works Association, 01/01/1994
- Publisher: AWWA
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The aim of this study was to investigate the ability of enhanced coagulation to remove organic precursors of halogenated disinfection byproducts (DBPs). The Environmental Protection Agency (EPA) currently regulates one type of DBP, trihalomethanes (chloroform, dichlorobromomethane, dibromochloromethane, and bromoform). The maximum contaminant level (MCL) for total trihalomethanes (TTHMs) is currently 0.10 mg/L. Stage 1 of the proposed Disinfectant and Disinfection Byproducts (D-DBP) Rule aims to lower the MCL for TTHMs to 0.080 mg/L and establish a MCL of 0.060 mg/L for total haloacetic acids (THAAs). The proposed Information Collection Rule will require utilities to collect and provide to the EPA information on concentrations of haloacetonitriles (HANs) (trichloroacetonitrile, dichloroacetonitrile, bromochloroacetonitrile, and dibromoacetonitrile), haloketones (Hks) (1,1-dichloropropanone and 1,1,1-trichloropropanone), and chloral hydrate (CH) precursive to discussions of regulations for these compounds. Enhanced coagulation, which is a modification to an already widely used treatment process, offers a potential solution to meeting DBP regulations. The EPA definition of enhanced coagulation is that coagulant dose at which an increase in 10 mg/L of coagulant does not reduce the TOC more than 0.3 mg/L.
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