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AWWA WQTC71523

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AWWA WQTC71523 Chloramines Dosing Kinetics in the Absence of a Prechlorination Step: Impact on Disinfectant Stability and DBP Formation

Conference Proceeding by American Water Works Association, 11/01/2009

Russell, Caroline; Wang, Yong; Karnik, Bhavana; Kommineni, Sunil

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This powerpoint presentation begins by providing a brief overview of nitrification and a chloramines dosing strategy to control nitrification. The problem statement asks, "Can excess Clsub2/sub be added to achieve the targetresidual at a 5:1 Clsub2/sub:NHsub3/sub-N ratio?" A case study of Trinity River water is presented that included previous dosing at a 5:1 applied ratio that resulted in freeammonia in the delivery pipe, and a reduction in NHsub3/sub could save money, but breakpoint rxnsare a concern. The experimental methodology included: bench-scale experiment;Clsub2/sub and NHsub3/sub added to Trinity River water in chlorinedemand-free amber glass bottles (250 mL); duplicates conducted for experiments zero (0) and 4; total and free chlorine measurements by DPDmethod (Hach 8167 and 8021); and,total ammonia by Salicylate Method (Hach 8155). Raw water characteristics are presented, along with chlorine demand in Trinity River water, minimal breakpoint reactions, and disinfection byproducts results. Includes tables, figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 20File Size: 1 file , 960 KB