Abstract Interest is growing in direct potable reuse where advanced‐treated water and raw water are blended and fed directly to a water treatment plant (WTP). However, the impacts of raw water augmentation on treatability at drinking water treatment plants have not been studied extensively. A pilot‐scale treatment system, consisting of coagulation, flocculation, sedimentation, and filtration, was set up at a WTP to treat potential future blends of advanced‐treated water and current raw water. The pilot plant was run with blends from 20% to 100% advanced‐treated water at a range of filtration rates (2–9 gpm/sf) and coagulant doses. Under all conditions, filterable water was produced, achieving acceptable turbidity removal. Turbidity removal by sedimentation was variable (30%–90%). Filtration performance was more consistent, exceeding 90% turbidity reduction under all conditions and achieving lower headloss accumulation rates at higher advanced‐treated water share. These results are optimistic for potable reuse schemes featuring raw water augmentation.

Hari Seshan

Michael J. Adelman

Paige J. Russell

Joseph Quicho

A pilot‐scale study of potable reuse impacts on surface water treatment

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