Implementing Recycled Water at SFIA with a Long-Term Goal of 100% Reuse

Transcription

1 Implementing Recycled Water at SFIA with a Long-Term Goal of 100% Reuse CA-NV AWWA Conference October, 2014 Todd Reynolds, P.E. Dawn Taffler, P.E., LEED AP

2 San Francisco International Airport (SFO)

3 SFO is like a Small City Water Supply comes from SFPUC and Hetch-Hetchy Wastewater Systems 1.7 mgd Industrial WWTP 2.2 mgd Domestic WWTP

4 SFO s Active Water Conservation

5 Existing Small Recycled Water System at WWTP

6 Recycled Water Program Objectives Short-Term Goals ( ): Develop RWMP; design and construct new recycled water plant and facilities; plan for delivery to the terminal and other potential users. Mid-Term Goals ( ): Supply recycled water to the terminal. Implement customer retrofits, design and construct additional recycled water facilities. Long-Term Goal (2018 and beyond): Achieve 100% reuse of generated wastewater.

7 Market Assessment

8 Potential Recycled Water Customers Additional Landscape Irrigation around the entire property

9 Potential Recycled Water Customers Commercial Rental Car Wash

10 Potential Recycled Water Customers Terminal Cooling Towers

11 Potential Recycled Water Customers SFO Terminal 2 is the First U.S. Airport to Achieve LEED Gold Certification

12 Peak Day Demand (MGD) Estimated SFO Recycled Water Demand 1.00 Estimated Peak Day Demands by Phase Phase 4 Phase 3 Phase 2 Phase Irrigation Non Irrigation Total

13 SFIA Tertiary Treatment Plant - Overall Objectives Reliable production to meet Title 22 initial 1 mgd and expansion to 2 mgd Flexible to treat IWP or SWTP effluent Simple operations and automated controls Future addition of RO for TDS reduction Coagulation MF/UF UV Inactivation

14 Pre-Bidding of the MF System based on robust, experienced membrane systems Single Fiber Polymeric Pall, Toray, Koch Multi-bore Polymeric Fiber BASF-inge Ceramic MF element - Metawater

15 Toray UF system was selected and is conducting a 3-month proving pilot test Source Water Parameter Turbidity Total Dissolved Solids Total Organic Carbon Color Average Value ~10 NTU ~990 mg/l ~20 mg/l ~50 CU

16 UF system works well for solids but TTP may need future treatment for TDS, Color and Organics Secondary Effluent Media Filter Filtrate UF Filtrate Potable Water

17 Different uses of recycled water require different levels of treatment Irrigation Irrigation/Industrial/Dual Plumbing IPR Secondary Effluent

18 Potential Water Quality Requirements Issues for SFIA RW Program Future Customers Potential Customer / Water Use Landscape irrigation (ornamental landscape and redwood trees) Dual-plumbed facilities (i.e., toilet flushing, laundry) Cooling towers (SFIA mechanical staff) Car wash (at Rental Car Center) Potable reuse (Groundwater Replenishment) Water Quality Parameter of Concern TDS, chloride, sodium color, odor ammonia, TDS, hardness hardness TDS, TOC,

19 Potential Additional Treatment Required Water Quality Parameter Salinity Potential Use Concern Landscape irrigation Cooling towers Treatment Technology Reverse Osmosis (RO) EDR Color and Odor Dual-plumbed facilities hydrogen peroxide (H 2 O 2 ) Reverse Osmosis (RO) Ammonia Cooling towers Reverse Osmosis (RO)

20 Potential for Groundwater Replenishment near SFO Urban Water Use WW Treatment Water Treatment RO + UV Graphic Credit: David Smith Groundwater

21 The New Frontier

22 Capitla Cost ($mil) RW Delivered [AFY] Capital Costs $35 $30 Capital Costs [$mil] RW Delivered at Buildout [AFY] 1,200 1,000 $ $ $15 $ $5 200 $0 Baseline Add-Alt A.1 Add-Alt A.2 Add-Alt B Add-Alt C Add-Alt D Add-Alt E.1 Add-Alt E.2 Add-Alt E.3 Add-Alt F.1 Add-Alt F.2 Add-Alt G 0 On Airport Build-out + RO + Off-Airport Irrigation Customers + GGNC + MF (No RO) + GGNC + MF + RO + IPR + MF/RO/AOP + Injection Wells + DPR + MF+ RO/AOP

23 Unit Life Cycle Costs Unit cost to irrigate small off-airport customers is high IPR is more costly than Non-Potable Reuse Unit cost of serving GGNC is low b/c minimal additional conveyance/distribution But DPR is less Centralized RO at MLTP On Airport Build-out + RO + Off-Airport Irrigation Customers + GGNC + MF (No RO) + GGNC + MF + RO + IPR + MF/RO/AOP + Injection Wells + DPR + MF+ RO/AOP

24 Questions Todd Reynolds, P.E., Dawn Taffler, P.E., LEED

25 Potential Recycled Water Users Landscape irrigation Toilet and urinal flushing Cooling (commercial and industrial) Boiler feed Industrial process water Commercial car wash Commercial laundry Washdown Street cleaning Firefighting Concrete mixing Decorative fountains Dust control Consolidation of backfill for pipeline construction Soil compaction Environmental use

26 Alternatives Analysis Alternatives On Airport Buildout No Advanced Treatment On Airport Buildout With Advanced Treatment On Airport Buildout + Off Airport Irrigation + GGNC 4 With Advanced Treatment On Airport Buildout + Off Airport Irrigation + GGNC 4 + IPR With Advanced Treatment On Airport Buildout + DPR With Advanced Treatment 1.A 1.B 2.A 2.B 3.A 3.B 4.A 4.B 5

27 Annualized Unit Cost ($/AFY) RW Delivered [AFY] Conceptual Level Life Cycle Cost Summary for RW Facilities $3,500 $3,000 $2,500 $2,000 $1,500 $1,000 $500 2,500 2,000 1,500 1, $0 Scenario 1.A Scenario 1.B Scenario 2.A Scenario 2.B Scenario 3.A Scenario 3.B Scenario 4.A Scenario Scenario 4.B 5 0

28 System Components and Configurations System Component Storage Pumping Distribution Pipelines Advanced Treatment Configurations Assessed Centralized: all storage located at MLTP Decentralized: storage split between MLTP and existing diesel tanks near Lot CC Centralized: all pumping located at MLTP Decentralized: pumping co-located with storage sites Sized to deliver recycled water to meet SFIA demands Sized to deliver recycled water to meet zero discharge goal Evaluate specific pipeline costs & benefits by phase Centralized advanced treatment Site-Specific advanced treatment/polishing

29 Direct Potable Reuse Home WW Treatment Water Treatment Nature RO + UV Graphic Credit: David Smith