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Test Methodologies for Assessing the Impact of Water Quality Changes on Corrosion and Corrosion Control Treatment Strategies
Citation:
LaDue, R., D. Williams, C. Devine, C. White, AND D. Lytle. Test Methodologies for Assessing the Impact of Water Quality Changes on Corrosion and Corrosion Control Treatment Strategies. 20th Annual EPA Drinking Water Workshop: Small System Challenges and Solutions, Covington, KY, September 11 - 14, 2023.
Impact/Purpose:
This poster proposes a new method for corrosion control treatment assessment which involves a recirculating batch flow through pipe loop with continuous input/output of the reservoir. This process eliminates the step of refilling the reservoir manually that is typically required for pipe loop studies and could smooth out/normalize spikes in lead/copper concentrations in the water.
Description:
Pipe loops or pipe rigs are a general term for a piece of pipe (which may be excavated after use in the water system or newly manufactured) connected to a rig, such that water is able to flow through the pipe and be sampled, in an effort to evaluate corrosion control measures before implementing them in the water system. Any type of pipe may be used, including lead pipe, copper pipe, galvanized iron pipe, and others. Previous experience has suggested that pipe rigs built with exhumed lead pipes containing realistic scales of the relevant water system can be helpful in providing insight into pipe scale transitioning and predicting the impact of water chemistry adjustments on lead(II) levels at the tap. This poster presents a new proposed method for corrosion control evaluation.