Home\Webcasts\Demonstrating Redundancy and Monitoring to Achieve Reliable Potable Reuse

Demonstrating Redundancy and Monitoring to Achieve Reliable Potable Reuse

November 10, 2016 @ 2:00 pm – 3:30 pm


2:00 p.m. – 3:30 p.m. EST
11:00 a.m. – 12:30 p.m. PST
PDHs: 1.5
Fee: Free for WateReuse Members and WE&RF Subscribers; $49 for Nonmembers

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Direct potable reuse (DPR) has the potential to greatly expand the scope of reuse worldwide, though questions remain about its ability to continuously protect public health. This uncertainty stems from the lack of full-scale performance data from actual DPR systems. Under legislative mandate, California is currently evaluating the feasibility of moving forward with DPR regulations.

To address this data gap, a Water Environment & Reuse Foundation study (WRRF 14-12) evaluated a 1.0-mgd demonstration facility at the City of San Diego’s North City Water Reclamation Plant to assess the benefits of redundancy and monitoring to achieve reliable potable reuse. Yearlong continuous monitoring of the treatment train—consisting of ozone, biologically active carbon, membrane filtration, reverse osmosis, and UV with advanced oxidation—provided an extensive dataset to assess process performance.

Routine testing was complemented with multiple challenge tests that assessed the benefits of the enhanced treatment. The performance data were used in a quantitative microbial risk assessment to demonstrate that a full-scale DPR treatment train can reliably meet performance goals and produce a water that provides public health protection equivalent to, or greater than, our conventional drinking water supplies.

This webcast will present the results of the reliability analysis and challenge tests, and shows how a combination of redundancy, robustness, and resilience can ensure DPR safety. Data from this project were utilized by the State of California in its feasibility analysis, and were key factors leading to the conclusion that DPR can be safely pursued.


  • Shane Trussell the President of Trussell Technologies, Inc. and has been working on potable reuse since 1996.
  • Brian Pecson is a supervising engineering with Trussell Technologies who is working on multiple issues in potable reuse, from public health goals and treatment to risk assessment.
  • Aleks Pisarenko received his Ph.D. in Chemistry from Miami University, and now works with Trussell Technologies on a number of potable reuse projects.
  • Rodrigo Tackaert is an Associate Engineer at Trussell Technologies involved with the operation and testing of the 1 MGD potable reuse demo facility.

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