Full Description

This project focused on investigating the impact of various parameters on the formation ofNDMA upon chloramination of organic polymers used in drinking water treatment. Specifically,the project was designed to answer the following questions:do anionic or nonionic polymers used in drinking water treatment also form NDMA;what is the impact of polymer dose on NDMA formation;what is the impact of chloramine contact time on NDMA formation;what is the impact of free chlorine contact time, upstream of ammonia addition, ondownstream NDMA formation;what is the impact of water pH on NDMA formation from polymers; and,do the polymer storage conditions affect its potential to form NDMA? While the testing was conducted in organic-free deionized laboratory water, itsresults should provide specific insights to water agencies on how to manage the chloramine-polymerinteraction and minimize NDMA formation at their plants.All bench-scale activities were conducted by Water Quality water. With the exception of Test 3, thechemical addition sequence was chlorine, followed by ammonia, and then followed by polymer.The chloraminated water was first prepared in bicarbonate-buffered Nanopure water. Thealkalinity of the buffered water was maintained between 95 and 100 mg/L as CaCOsub3/sub. Thechloraminated water was then split into amber glass bottles to which the target polymer doseswere added. All chemical solutions were prepared in Nanopure water. Includes 11 references, tables, figures.

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Edition: Vol. - No. Published: 06/17/2004 Number of Pages: 19File Size: 1 file , 460 KB