Potable Reuse as an Alternative Water Supply. AWRA Conference Orlando, FL

Transcription

1 Potable Reuse as an Alternative Water Supply AWRA Conference Orlando, FL

2 Who We Are New Port Richey Tampa St. Petersburg

3 100 percent groundwater pumped from 13 wellfields Tampa Bay Water History

4 Integrated, Flexible System 13 wellfields, 176 wells 120 million gallon per day surface water treatment plant 15.5 billion gallon reservoir 25 million gallon per day seawater desalination plant

5 Current Drinking Water Sources Groundwater, 65% Surface Water, 30% Desal Water, 5%

6 The Need for New Supplies Demands and Supply, million gallons per day Aggregate Permitted Capacity Sustainable Water Supply (Normal) Drought Water Supply Year supply needed

7 Un-Ranked Future Supply Options Seawater Desalination Expansion Gulf Coast Desalination Thonotosassa Wells Surface Water Expansion Aquifer Recharge Project Additional Groundwater from Existing Wellfields Potable Reuse

8 Un-Ranked Master Water Plan Project Concepts for Feasibilities Studies Source Water Reclaimed Water Surface Water Groundwater Seawater 1. Aquifer Recharge South Hillsborough County Wellfield SHARP 2.a. Surface Water Expansion Alafia River Reservoir Additional groundwater from existing wellfields Small footprint reverse osmosis Project concepts 2.b. Surface Water Expansion - TBC Purified TAP 3. Thonotosassa wells 4.a.Tampa Bay Desalination Expansion 4.b. Tampa Bay Desal. w/reclaimed water 5. Gulf Coast Desalination

9 South Hillsborough County Wellfield Recharge 25 MGD Injection Well Production Wells Tampa Bay Water System Purified WTP ~ 22 miles Groundwater WTP Reclaimed Water Source Recharge Wellfield ~ 1500 feet

10 Aquifer Recharge and Wellfield with SHARP Influence MIA - Outside MIA/Inside SWUCA - Inside SWUCA 3

11 Aquifer Recharge and Wellfield Project considerations and challenges Water quality of injection wells Additional treatment of groundwater Ability to maximize capture rates Groundwater impact offsets (credits) Southern Water Use Caution Area Salt Water Intrusion Minimum Aquifer Levels Dependence on another entity

12 Supplement Surface Water Supply Increase supply to Surface Water Treatment Plant 20 million gallons per day Purified Reclaimed Water

13 Surface Water System Expansion Project considerations and challenges Seasonality and quantity availability Operational constraints Permitting constraints Additional water quality treatment requirements Cost of raw source Withdrawal constraints

14 City of Tampa Augmentation Project Two alternative delivery methods of reclaimed water to City s system Applying reclaimed water to RIBs Recharge/recovery system to store and recover reclaimed water in the Floridan Aquifer for subsequent delivery to the Hillsborough River Reservoir Coordination ongoing through the pilot feasibility program

15 City of Tampa Augmentation Project Reclaimed Water ASR at Tippin Water Treatment Plant ~40 million gallons per day Reclaimed Water (RIBs/Wetlands)

16 Desalination Expansion: Reclaimed Water Blended with Raw Seawater Chemical Treatment Existing Seawater Intake Screening Settling Sand Filters DE Filters Cartridge Filters Reclaimed Water Source (Option 1) Acid Antiscalant Stabilization Chlorine ~ 10 miles To Tampa Bay Water Transmission System Reverse Osmosis Concentrate Disposal Storage Blend with finished water from Regional Surface Water Treatment Plant

17 Desalination Expansion: Treated Reclaimed Water Blended with Treated Seawater Chemical Treatment Existing Seawater Intake Screening Settling Sand Filters DE Filters Cartridge Filters Acid Antiscalant Stabilization Chlorine ~ 10 miles To Tampa Bay Water Transmission System Reverse Osmosis Concentrate Disposal Reclaimed Water Source with additional treatment (Option 2) Storage Blend with finished water from Regional Surface Water Treatment Plant

18 Blending with Desalinated Seawater Major Considerations (raw water): Source/quality of supply and potential blends Impact on existing pretreatment, pumps, membranes Need for additional barriers Concentrate discharge and permitting impacts Monitoring Direct potable reuse option Major Considerations (post desal): Source/quality of supply Need for additional barriers Site Limitations Permitting Monitoring Distribution

19 Hazard Analysis and Critical Control Point (HACCP) Systematic preventative approach to food safety Focus on barriers not end of pipe treatment

20 What Does the CCP Approach Provide? Focus is on health relevant contaminants.

21 Regulatory Considerations Potential rules conflict Perform gap analysis in the regulations Ensure no prohibition of Direct Potable Reuse Define Indirect and Direct Potable Reuse Determine how to assess risk Determine starting point for effluent quality Define treatment targets

22 Feasibility Evaluation Criteria Environmental Stewardship Permittability Sustainability Carbon Footprint Public Acceptance Project Costs Capital O&M Life Cycle Ability to Phase Reliability Resiliency Emergency Conditions Proven Technology Operational impacts Institutional factors Risk factors Based on the 3 Board-Approved Master Water Plan Goals

23 Public Outreach Member governments coordination Project fact sheets Agency website updates Public involvement meetings Workshops Ad hoc committee of Board of Directors workshops and one-on-one briefings

24 Long-Term Master Water Plan Implementation Schedule Task Description Reclaimed Water Evaluation Coordination with Ongoing Activities Feasibility Study Member Government Projects Master Water Plan Update Public Outreach Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

25 Questions?