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#2178 Drinking Water Chloramine Chemistry 101 WEBINAR IEPA #8896

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Drinking Water Chloramine Chemistry 101


LIVE DATE: 05/20/15

CEU TYPE: Technical

IEPA#: 8896


Presenter: David Wahman
David is currently an Environmental Engineer in the United States Environmental Protection Agency (USEPA) Office of Research and Development located in Cincinnati, Ohio. He is a registered Professional Engineer and received his B.S. in Civil Engineering from Rose-Hulman Institute of Technology, M.S.E. in Environmental and Water Resources Engineering and Ph.D. in Civil Engineering from The University of Texas at Austin. Following graduation, he conducted a Post-Doctoral fellowship at the USEPA before accepting a permanent position. He has a special interest in the application of molecular based tools, modeling, and biological treatment to address drinking water treatment and distribution system issues, and his research areas include biological removal of disinfection by-products from drinking water, biological drinking water treatment, distribution system nitrification, and chloramine chemistry.

Summary:Many utilities now use chloramines for secondary disinfection to minimize regulated disinfection by-product formation. Chloramine chemistry can be complex. The reactions and rates governing chloramine formation and subsequent "decay” are described by the Unified Model. Although the Unified Model does not consider additional "demand” reactions that occur in actual water systems (e.g., reactions with natural organic matter and nitrite), understanding the underlying chemistry described by the Unified Model provides a fundamental baseline for interpreting actual system operation and proposed operational changes. Using the Unified Model as a conceptual basis, this presentation provides an introduction to chloramine chemistry, explaining chloramine formation and "decay” under drinking water conditions and highlighting the reasons why pH and chlorine to nitrogen ratio are important. In addition, the presentation will tie this fundamental chemistry to practical implications for utilities when using chloramines.


COST & REGISTRATION: Illinois Section AWWA Members: FREE; Nonmembers: $30; IND: $25

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