January 2017 Vol. 72 No. 1


WRF Releases Results From Direct Potable Reuse Study

The Water Research Foundation (WRF), a leading sponsor of potable reuse research, has released interim results from the ongoing study, “Blending Requirements for Water from Direct Potable Reuse Treatment Facilities” (#4536). The objective of this project is to provide guidance for the appropriate use of blending as part of a direct potable reuse (DPR) project. The study is examining the impact of four blending variables: source water type, blending location, recycled water ratio, and type of advanced treatment train.

Bench-scale treatment/distribution system simulations were based on the participating utilities’ (Santa Clara Valley Water District, City of Ventura, Clark County Water Reclamation District, and Los Angeles Department of Water & Power) full-scale processes. The parameters tested include pathogens, emerging contaminants, regulated contaminants, corrosion-related issues, and general parameters such as pH and turbidity.

Preliminary findings are as follows:

  • Blending with DPR waters may help lower trihalomethanes.
  • Blended water quality and bacterial activity appear to be predominant factors for corrosion products in premise plumbing testing.
  • Antibiotic resistance gene composition in DPR blends appears similar or better than in potable water tests.

The final project results should be published in early 2018.

For more information, contact Katie Henderson, WRF Research Manager, at (303) 347-6108 or khenderson@waterrf.org, or visit waterrf.org.

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