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Disinfection Addition and Disinfection Changes: What It Means to the LCR
Citation:
SCHOCK, M. R. Disinfection Addition and Disinfection Changes: What It Means to the LCR. Presented at EPA Workshop on Small Drinking Water Systems: Challenges and Solutions, Cincinnati, OH, August 04 - 06, 2009.
Impact/Purpose:
To inform the public.
Description:
This slide presentation’s general points are: Many protective pipe scales are vey dependent on ORP, and hence, state of disinfection. Adding disinfection to anoxic systems will likely cause big chemistry changes in DS and corrosion. Changing disinfectants could cause major lead or copper problems, depending on: What the change is and what the redox/disinfection history was. Only a certain fraction of surficial material may be mobile in response to give water chemistry change. The health risk is generated a complex function of physical and background chemistry interactions, nature of disinfection change and identity of element(s) in changed scales. Only some water systems may have particular noxious constituents in their raw or finished water. Some changes could be beneficial to LCR compliance, i.e. Pb02 formation, but can constrain long-term treatment choices.