The Initial Step for Metropolitan’s Regional Recycled Water Program August 13, 2019
OUTLINE • Program Overview • AWT Demonstration Plant • Direct Potable Reuse (DPR) Considerations • Demonstration Testing 2
PROGRAM OVERVIEW
PROGRAM BACKGROUND • Pilot Scale Studies (2010-12) • Progress Report (Sept. 2015) • Board approval and appropriation for Demonstration Plant (Nov. 2015) • Feasibility Study Report (Nov. 2016) • Demonstration Plant – Completion of Final Design (Feb. 2017) – Construction Completion & Start-up (Sept. 2019) • Conceptual Planning Studies Report (Feb. 2019) • White Papers (July & Fall 2019) 4
PROGRAM APPROACH • Primary objective indirect potable reuse for groundwater recharge • Two-phase approach (100 mgd followed by 50 mgd or more) • Built around backbone conveyance system • Preserving flexibility for the future – DPR utilizing raw water augmentation – Additional effluent from JWPCP – Integration with City of Los Angeles and other purified water systems 5
AWT LOCATION AT JWPCP
PROGRAM ELEMENTS 7
IMPLEMENTATION OPTIONS Traditional Programmatic EIR (PEIR) Option Everything above plus: Accelerated • Tiered project-level document for Construction 3.5-mile pipeline Accelerated Everything above plus: Water • Initial AWT plant (approx. 20 mgd) • Conveyance to West Coast Basin Delivery 8
ADVANCED WATER TREATMENT DEMONSTRATION PLANT
DEMONSTRATION PROCESS 0.5-MGD Capacity 0.25 MGD Membrane 0.50 MGD System for 0.50 MGD 20 GPM Aerobic MBR and Reverse UV/ 0.25 MGD Anoxic Osmosis AOP JWPCP Return Tanks Membrane Non-nitrified to System for Secondary JWPCP MBR Effluent Waste Activated Sludge RO Brine and to JWPCP Return to JWPCP
UV/Advanced Chemical Feed Systems Reverse Oxidation Process Osmosis MBR – Aerobic and Anoxic Tanks MBR – Membrane Modules
MBR AT DEMONSTRATION PLANT Fine Screening Aeration Basin Nitrification Anoxic Basin Denitrification Membrane Modules Filtration 12
MBR FOR WATER REUSE • Commonly used in non-potable reuse applications • Limited use in potable reuse projects due to lack of pathogen removal regulatory credit to date • Ongoing industry efforts to quantify pathogen removal through MBR • Effective technology for treating JWPCP effluent – Removes pathogens – Manages nitrogen – Minimizes RO fouling – Removes biodegradable CECs 13
MBR System Membrane Modules Anoxic Basin Aeration Basin Drum Screen Membrane Scour Blower Aeration Blowers
MBR Membrane Modules MBR-1 (Suez) MBR-2 (Evoqua)
FACILITY UNDER CONSTRUCTION (BEFORE CANOPY) RO & UV/AOP Equipment MBR Aeration Chemical & Storage & Anoxic Unloading Basins Electrical Building
CONSTRUCTION COMPLETE
SYSTEM COMMISSIONING
DIRECT POTABLE REUSE CONSIDERATIONS
CALIFORNIA RECYCLED WATER REGULATIONS Non-Potable Indirect Indirect Direct Direct Reuse Potable Reuse Potable Reuse Potable Reuse Potable Reuse Reservoir Treated Irrigation Groundwater Raw Water Water Drinking Water Industrial Uses Augmentation Augmentation Augmentation Augmentation 2000 2014 2018 2023 TBD Increasing requirements for public health protection
RAW WATER AUGMENTATION • Direct potable reuse (DPR) through raw water augmentation (RWA) is the placement of advanced treated water into a raw water conveyance system upstream of a drinking water treatment plant • State Water Resources Control Board (State Board) is required to adopt uniform water recycling criteria for RWA by the end of 2023 – Regulatory adoption could be delayed to mid-2025 depending on state of science at that time 21
RAW WATER AUGMENTATION OPTIONS Weymouth Water Initial Backbone System Treatment Plant Santa Fe Additional Basin Options Pump Station(s) Spreading Future RWA Options Grounds Yorba Linda Montebello Forebay Pump Station Feeder Injection Wells Rio Hondo Spreading Grounds Diemer Water Treatment Plant Long Beach Harbor Junction West Coast Injection Wells Industrial East Orange Structure Basin Users County Feeder #1 Injection 60-mgd Pipeline Wells Orange County Spreading Grounds JWPCP 150-mgd AWT & Pump Station 22
RWA CONSIDERATIONS AND ANTICIPATED REQUIREMENTS • Enhanced source control and wastewater treatment optimization • Higher levels of advanced treatment and treatment redundancy through multiple independent barriers • More rigorous monitoring and enhanced tools to respond to “off-spec” events • System integration that minimizes impacts on blended water quality 23
TREATMENT FACILITY OPTIONS • Additional RWA treatment processes could be: – Part of the AWT facility planned at JWPCP, or – At a potential satellite facility downstream; only flow to be used for RWA would be treated to more stringent requirements • Further discussion with State Board is needed to determine potential acceptance of a satellite facility concept 24
BLENDING SUPPLIES AT WEYMOUTH From Live Oak Reservoir (La Verne Pipeline) State Project Water (SPW) From Lake Junction Mathews Weymouth Structure (Upper Feeder) Plant Influent Colorado River Water (CRW) Blend of SPW and CRW N To Diemer Plant (Yorba Linda Feeder) Weymouth Aerial Location Map 25
DEMONSTRATION TESTING
DEMONSTRATION TESTING OBJECTIVES • Demonstrate efficacy of additional treatment processes for pathogen and chemical control • Demonstrate appropriate treatment train (for onsite or satellite facility) to meet anticipated RWA regulatory requirements • Develop and evaluate water quality criteria and blending strategies for advanced treated water upstream of drinking water treatment plants • Develop, evaluate, and optimize analytical methods for detecting microbial and chemical contaminants 27
DEMONSTRATION FACILITY TESTING OPTIONS FOR RWA Back to JWPCP Secondary NdN + Reverse UV/AOP Effluent Tertiary MBR Osmosis (non-nitrified) Example of additional processes for onsite treatment option Ozone BAC MF • Additional processes could be applied at pilot or demonstration scale in various treatment train configurations 28
DEMONSTRATION FACILITY PRELIMINARY TESTING SCHEDULE 2019 2020 2021 2022 2023 2024 2025 Phases 1 & 2 MBR Testing Raw Water Augmentation Test Plan Development ISAP/Regulator Review Design Construction Testing RWA Regulatory Adoption With Extension Operations/Testing Construction Design Completion 29
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