The Impact of Desalinated Water on Blended Supplies: A Comprehensive Analysis (WRF 5061)

Title – 30pt Arial Bold Subtitle 24pt Arial Names, Dates, and Other Things – 16pt Arial (Box can be resized for longer titles) The Impact of Desalinated Water on Blended Supplies: A Comprehensive Analysis Brent Alspach, PE, BCEE Arcadis WED08, 10:30 am Acknowledgements Brent Alspach, Principal Investigator VP & Director of Applied Research Research Team Arcadis Greg Imamura, Lead Engineer / PM Principal Engineer Arcadis Francesca DePrima, Research Support Project Engineer Arcadis Acknowledgements Water Research Foundation Harry Zhang Research Program Manager Pam Prott Project Coordinator PPrroojjeecctt AAddvviissoorryy CCoommmmiitttteeee MMaallyynnddaa CCaappppeellllee UUSS BBuurreeaauu ooff RReeccllaammaattiioonn NNaatthhaann FFaabbeerr SSaann DDiieeggoo CCoouunnttyy WWaatteerr AAuutthhoorriittyy CChhrriissttiinnee OOwweenn HHaazzeenn aanndd SSaawwyyeerr WWaarrrreenn TTeeiittzz Southern California Salinity Coalition GGrreegg WWooooddssiiddee Southern California Salinity Coalition Acknowledgements Partner Agencies Carlsbad Municipal Water District City of Escondido City of San Diego Administrator of the Helix Water District Carlsbad Desalination Olivenhain Municipal Water District Plant (CDP) Otay Water District Poseidon Water / Channelside San Diego County Water Authority Sweetwater Authority Vallecitos Water District Project Overview: Background Research Focus: Flow and hydraulics Water quality  General physical/chemical Previous  Salinity and chloride Research  Disinfectant residual  Nitrification  Disinfection by-products  Corrosion  Boron and SAR  Qualitative findings Generate a reference for the U.S. water treatment industry for better anticipating the potential water quality impacts that may occur in similar seawater or other desalination applications. Provide San Diego area utilities receiving desalinated seawater with an understanding of water quality influences, along with a database “Phase 1” to support associated strategic operational decisions. 2. Phase 1 (4773): What You Need to Know SDCWA Treated Water Supplies High-Level Project Synopsis Imported treated water, from MWD’s Collect data over a 3-year window Skinner WTP – Two pre-CDP baseline years: 2014-15 – First year of CDP operation: 2016 Imported raw water, treated locally at Focus on water quality data collected the Twin Oaks Valley WTP during routine system operation CDP desalinated seawater Utilize existing monitoring locations Combined sources of Colorado River Water (CRW) & SDCWA Imported Water Blends State Project Water (SPW) 2014-2019 Year Avg. % SPW 2016 7.2% 2017 58.9% Omitting January and December 2017 Post-WRF 4773… 100% 90% 80% 70% CRW and SPW 60% are known to exhibit 50% broad differences 40% in water quality 30% 20% 10% Total organic carbon (TOC) 0% Total dissolved solids (TDS) SDCWA Imported Water Blends 2014-2019 notiisopmoC retaW detropmI % SPW % CRW.