AWWA Best Paper Award: Perchlorate, Bromate, and Chlorate in Hypochlorite Solutions
(NEW YORK, NY – August 14, 2012) – The paper, Perchlorate, Bromate, and Chlorate in Hypochlorite Solutions: Guidelines for Utilities, based on Water Research Foundation project #4147, won the American Water Works Association’s (AWWA) 2012 Water Quality & Technology Division Best Paper Award earlier this year. In addition, it also received the AWWA Publications Award at ACE, a distinction given to the best overall paper, as selected from all the division winners. The paper was authored by Benjamin D. Stanford, Hazen and Sawyer; Aleksey N. Pisarenko, Southern Nevada Water Authority; Shane A. Snyder, University of Arizona; and Gilbert Gordon, Miami University.
Every year, AWWA recognizes the most notable contribution, scientific or practical, to the public water supply profession.
This paper outlines how utility purchasing decisions and hypochlorite storage and handling methods can potentially affect perchlorate, chlorate, and bromate levels in finished drinking water. The research project for which the paper was based on, was undertaken in response to pending perchlorate regulation by the U.S. Environmental Protection Agency and was a collaboration between the Foundation and AWWA.
The paper describes recent work to develop a predictive model for quantifying the formation of perchlorate and chlorate in hypochlorite solutions during storage. It also provides recommendations to minimize the introduction of perchlorate, chlorate, and bromate during the treatment process. These include:
Bulk hypochlorite solutions should be purchased as a filtered product with low metals concentrations and should be stored diluted and/or in a cooled container to minimize decomposition and contaminant formation. For hypochlorite generated onsite, high-purity, low-bromide salts should be purchased to minimize bromate formation.
By following these and other recommendations, utilities can make informed decisions about hypochlorite storage and handling to help maximize the free available chlorine in solution while minimizing formation of unwanted contaminants such as chlorate, perchlorate, and bromate.
Since our founding in 1951, Hazen and Sawyer has focused on two things: providing safe drinking water and controlling water pollution. Our range of services encompasses the planning, design, and construction management of water and wastewater-related projects – from clean water treatment, storage, and distribution to wastewater and stormwater collection, treatment, and reuse.