Wastewater Master Plan Status Update. City of Portsmouth, New Hampshire

Transcription

1 Wastewater Master Plan Status Update City of Portsmouth, New Hampshire November 21, 2011

2 Topics for Discussion Review of Master Plan Effort Regulatory Status Pilot Effort to Verify Technology Selection Regional Cooperation

3 Wastewater Master Plan Components Wastewater Treatment Facilities Collection System CSO LTCP

4 Combined Sewer Overflow Long Term Control Plan

5 Combined Sewer Overflow Long Term Control Plan - Contract 3B

6 Combined Sewer Overflow Long Term Control Plan - Cass Street Area

7 Secondary Treatment on Peirce Island Within Fence Line

8 Phased Compliance Strategy Peirce Island/Pease Secondary treatment at Peirce Island within existing fence line by late 2016 WMP team identified innovative technologies with potential to reduce footprint of upgrade requirements Preliminary engineering, including on-site testing of potential technologies will be completed to assist with final technology selection Expanding Pease over time as regulatory and economic conditions permit

9 Regulatory Status Current EPA Consent Decree - Wastewater Master Plan - Completed - Upgrade Peirce Island According to Schedule in Wastewater Master Plan - Complete Targeted Long Term Control Plan Sewer Separation Project - EPA Requires a Modification to the Existing Consent Decree to Incorporate Wastewater Master Plan Schedule Peirce Island NPDES Permit Renewal Application Due December 31, Anticipating Secondary only however pressure is building to add Nutrient Removal to the Permit Pease Wastewater Treatment Facility NPDES Permit is pending. Anticipating Secondary only however pressure is building to add Nutrient Removal to the Permit

10 Regulatory Status (cont.) Modified EPA Consent Decree Schedule CSO- LTCP Completion by Contract 3A Lincoln, Spring, Willow, Miller, Broad - Contract 3B Richards, Rockland, Highland, Miller, Merrimac - Contract 3C Streets off of Lincoln, Union, Wibird, Park - Cass Street Area Upgrade Peirce Island Completion Pilot Potential Technologies - Preliminary Design Vender Selection - Final Design - Construction

11 Pilot Study

12 Pilot Program Flow Chart WWMP Piloting Effort Potential Secondary Treatment Technologies Wastewater Characterization Needs Review/Evaluate Potential Treatment Technologies Wastewater Characterization Data Collection Pilot Technology Selection Workshop Initial Piloting Phase Initial Piloting Review Preliminary Design Demonstration Phase Data Review (and Vendor Selection if Needed) Vendor Demonstration/ Verification Phase

13 List of technologies 1. Biological Aerated Filter (BAF) 2. Sequencing Batch Reactor (SBR) with BioMag 3. Conventional Activated Sludge (CAS) with BioMag 4. Moving Bed Bioreactor (MBBR) & ActiFlo 5. Moving Bed Bioreactor (MBBR) & CoMag 6. Moving Bed Bioreactor (MBBR) & DAF 7. Membrane Bioreactor (MBR) 8. Conventional Activated Sludge (CAS)

14 Non-Monetary Evaluation Criteria Operational Track Record/Established Process Operability (No. of Processes/Complexity of Processes) Ability to Retrofit Conv. Secondary Treatment to Meet Future Nitrogen Limits of 8 mg/l Ability to Retrofit TN 8 to Meet Future Nitrogen Limits of 5/3 mg/l Constructability Site Layout Hydraulic Complexity Ability to Stay Within Fence Line for Secondary Treatment Ability to Stay Within Fence Line for Future TN Treatment Ability to Treat High FOG Levels

15 Table 11 Option Evaluation Matrix Option 1 - BAF Option 2 - SBR w/ BioMag (Not Feasible) Option 3 - CAS w/ BioMag Option 4 - MBBR & ActiFlo Option 5 - MBBR & CoMag Option 6 - MBBR & DAF Option 7 - MBR Option 8 - Conventional Activated Sludge Evaluation Criteria Weight Rating Score Rating Score Rating Score Rating Score Rating Score Rating Score Rating Score Rating Score Operational Track Record/Established Process Operability (No. of Processes/Complexity of Processes) Ability to Retrofit Conv. Secondary Treatment Meet Future Nitrogen Limits of 8 mg/l Ability to Retrofit TN 8 to Meet Future Nitrogen Limits of 5/3 mg/l Constructability Site Layout Hydraulic Complexity Ability to Stay Within Fence Line for Secondary Treatment Ability to Stay Within Fence Line for Future TN Treatment Ability to Treat High FOG Levels Total Weighted Criteria Capital Cost (estimated - in millions) $33.0 $37.0 $32.0 $34.0 $32.0 $42.0 $39.0 Value Ratio (criteria/capital cost) Life Cycle Cost (in millions) $40.8 $46.7 $41.2 $47.4 $39.7 $53.3 $46.8 Value Ratio (criteria/ life cycle cost)

16 Technologies Selected For Piloting Biological Aerated Filter (BAF) Conventional Activated Sludge (CAS) with BioMag Moving Bed Bioreactor (MBBR) & DAF

17 Physical Pilot Construct/Assemble Side by Side Pilot Units Treat Primary Effluent in Dry Weather, CEPT Effluent in Wet Weather Initial Focus on Secondary Treatment testing, then modify to achieve Total Nitrogen Removal Initial Pilot 6 Month Period

18 Pilot Unit Construction Photos

19 Pilot Unit Construction Photos

20 Pilot Unit Construction Photos

21 Pilot Unit Construction Photos

22 Comparison of Consent Decree Estimated Costs Cost Item Option 1 - BAF Option 2 - SBR w/biomag Option 3 CAS w/biomag Option 4 - MBBR & ActiFlo Option 5 - MBBR & CoMag Option 6 - MBBR & DAF Option 7 - MBR Option 8 - CAS Capital $33.00 $37.00 $32.00 $34.00 $32.00 $42.00 $ Year Present Worth O&M Not Feasible $7.77 $9.71 $9.19 $13.37 $7.67 $11.32 $ Year Life Cycle Note: All Costs in $ millions $40.77 $46.71 $41.19 $47.37 $39.67 $53.32 $46.81

23 Projected Sewer Rate ($ per Unit) Sewer Rate ($/Unit) $40M 2017 $60M 2017 $80M WWTF Adder Future Rate w/o WWTF Current Rate One Unit = 748 gallons * Imposition of nutrient limits will require additional capital investment

24 Regional Cooperation Why Participate in Regional Cooperation Pending City Permits will be impacted by the decisions the Regulators make relative to the Great Bay and the Piscataqua River Recognition that complex environmental challenges are regional in nature As a Coalition we leverage resources and are more likely to have input in regulatory decision process Southeast Watershed Alliance Great Bay Municipal Coalition Memorandum of Agreement with DES to improve scientific understanding and ensure scientifically based, cost effective, community minded solutions are selected Adaptive Management Plan Allows for an alternative approach to meeting water quality

25 Proposed Adaptive Management Plan The Proposed adaptive management plan allows new information to be incorporated into a watershed management plan. Allows for scientific research, monitoring, and implementation that provides an opportunity to build and measure. Specifically: Commits the communities of Exeter, Dover, Newmarket to a Total Nitrogen limit of 8 mg/l which will reduce DIN to pre-1990 levels Commits communities to participate in water quality monitoring program to improve scientific understanding of the issues Commits communities to participate in eelgrass and shellfish restoration efforts. Commits communities to participate in non-point pollutions reduction Proposed Adaptive Management Plan is Currently being Reviewed by the Regulators

26 Plan of Action Complete Targeted Sewer Separation Underway Continue Regional Cooperation On-going Pilot Emerging Technology - Underway Preliminary Design & Vender Selection- Completion 2013 Final Design Completion Construction Completion - Aug 2016

27 Questions & Answers