California and other states are developing direct potable reuse (DPR) regulations and/or guidelines with high pathogen log removal value (LRV) requirements and in California reverse osmosis is required as one of the advanced treatment processes. Results from two full scale facilities that were part of the Water Research Foundation (WRF) 4958 project, testing native molecular markers and surrogates in RO membrane systems, will be presented. Results will be presented in the context of regulatory requirements, demonstrating both the test method “sensitivity” and “resolution” as defined by the membrane filtration guidance manual (MFGM). Integrity testing methods evaluated in this project included conductivity profiling (both manual and automated sampling), a fluorescent marker (uranine), and native ionic species (sulfate, phosphate, magnesium, and strontium). Male-specific bacteriophage (MS2) challenge testing was also performed. The testing results from the Water Corporation of Western Australia (WCWA) and the Yucaipa Valley Water District (YVWD). The testing at was conducted under a variety of membrane conditions (old, oxidized, and breached membranes, or leaking connectors) to establish the range of LRVs and determine worst case conditions.
This presentation is available to AMTA Members only.
- Jason Assouline
- Carollo Engineers, Inc.
- AMTA/AWWA Membrane Technology Conference, Las Vegas
- AMTA/AWWA Membrane Technology Conference
- Nanofiltration, Reverse Osmosis, Potable Reuse