Processes Controlling the Development of Effective Lead Corrosion Control with Orthophosphate
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Associated Project
Lead in drinking water is a topic of interest for many water utilities. The addition of orthophosphate for corrosion control is one strategy that has the potential to reduce lead release to the tap. This webcast presented findings from WRF’s recent project, Processes Controlling the Development of Effective Lead Corrosion Control with Orthophosphate (4686). The researchers performed laboratory-scale experiments for two scenarios to further investigate the impact of orthophosphate addition on lead release. One was the addition of orthophosphate to water in pipes that have scales containing lead(IV) oxides (PbO2) before and after the residual disinfectant is switched from free chlorine to chloramine. The other was the addition of orthophosphate to water in pipes at a higher pH (~10.3) than that for which orthophosphate is typically used (i.e. pH 7.2-7.8). The results, conclusions, and recommendations from this study were discussed on this webcast.