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HomeMy WebLinkAbout03.b. Receive an overview of the Nutrient Management Planning and Predesign ProjectPage 1 of 17 Item 3.b. F__1_448�411C_S0 September 12, 2024 TO: REAL ESTATE, ENVIRONMENTAL AND PLANNING COMMITTEE FROM: NITIN GOEL, OPERATIONS OPTIMIZATION DIVISION MANAGER MELODY LABELLA, RESOURCE RECOVERY PROGRAM MANAGER REVIEWED BY: GREG NORBY, DEPUTY GM - ENGINEERING & OPERATIONS ROGER S. BAILEY, GENERAL MANAGER SUBJECT: RECEIVE AN OVERVIEW OF THE NUTRIENT MANAGEMENT PLANNING AND PREDESIGN PROJECT Staff will present an overview of the Nutrient Management Planning and Predesign Project. Strateaic Plan re -In GOAL ONE: Customer and Community Strategy 2 - Promote initiatives to advance affordable and equitable access to services GOAL TWO: Environmental Stewardship Strategy 1 - Achieve compliance in all regulations, Strategy 3 - Be a partner in regional development of local water supply, Strategy 4 - Identify and advance sustainability initiatives, including reducing energy usage and emissions GOAL SIX: Infrastructure Reliability Strategy 1 - Manage assets optimally, Strategy 2 - Execute long-term capital renewal and replacement program GOAL SEVEN: Innovation and Agility Strategy 1 - Leverage data analytics to become a more efficient utility, Strategy 2 - Implement organization -wide optimization, Strategy 3 - Be adaptable, resilient, and responsive ATTACHMENTS: 1. Presentation September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 8 of 26 Page 2 of 17 September 12, 2024 0-.* .-- -- Nutrient Management Planning & Predesign Project fiftaffiffij Real Estate, Environmental & Planning Committee Meeting Nitin Gael, P.E. Operations Optimization Division Manager Melody LaBella, P.E. Resource Recovery Program Manager September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 9 of 26 1 Page 3 of 17 Bay Area Nutrients Watershed Permit On July 10, 2024, the San Francisco Regional Water Quality Control Board adopted an Order requiring all Bay Area wastewater agencies to reduce their discharge of total inorganic nitrogen (TIN) by 40%, relative to 2022, by October 2034. Regional Water Board adopts permit requiring critical investments to protect San Francisco Bay Necessary sewage treatment upgrades over next decade will limit Alof •red tides' that endanger —ter quality, aquatic species July 10, 2024 Contact: Blair Robertson —Information Officer OAKLAND - To help protect water quality and aquatic life in San Francisco Bay for generations to come, the San Francisco Bay Regional Water Quality Control Board adopted a permit today that will for the first time require nutrient reductions for all wastewater treatment plants discharging into the bay. The new permit, adopted under the Clean Water Act after years of monitoring and esearch, will go into effect Oct_ 1. It requires that 40 sewage treatment plants must collectively reduce nitrogen discharges by 40% compared to 2022, when a'red tide" harmful aigai bloom (Has) triggered a massive Fish kill in the San Francisco Bay. Nutrients are discharged into the bay from sewage treatment plants' wastewater_ Excessive nutrients are a major contributor to HABs, which cause a dramatic depletion in dissolved oxygen levels, killing aquatic species. Toxins from HABs can cause illnesses through direct contact, inhalation, and f sh and shellfish poisoning. HABs can be particularly devastating to indigenous communities and subsistence fishers. September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 10 of 26 2 Page 4 of 17 TIN Removal in Central San's Treatment Plant Approximately 18-27% of Central San's influent TIN is removed through solids incineration (TIN in the solids is converted nitrogen gas) and by Central San's Recycled Water Program, which facilitates beneficial reuse of nitrogen via landscape irrigation. Capital Improvement Projects are in progress to address aging infrastructure challenges and extend the remaining useful life of high value assets with concrete repairs and seismic upgrades. The existing biological process cannot further remove TIN without expansion to accommodate high mixed liquor concentrations or the addition of process intensification and densification with new technology. Current Secondary Process Wastewater o ° a°° Ultraviolet from Collection4 ° , ° ° Disinfection System Primary Anaerobic Aeration Secondary Then Recycled Water Headworks Clarifiers * Selector Tanks or Outfall to Suisun ( 4) Clarifiers (4) Bay (8) Scrubbed Flue Gas to I Atmosphere Return Activated Sludge Waste Activated Ash to Beneficial Reuse Dewatering Sludge Return Flows to Plant and Incineration 'Anaerobic Selector is mixed but with no aeration or dissolved oxygen. i September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 11 of 26 3 2021 - 2027/2028 � 2018 Aeration Basin Diffuser Replacement and Seismic Upgrades Project Evaluation on pilot testing Membrane MABR included as alternative in predesign Aerated Biofilm Reactor (MABR) vs. Aerobic Granular Sludge 2020 - 2ctrc BloBlo Eleiwer Improvements, District Project (DP) 100015 . 2017 , 2018 , 2019 Comprehensive Wastewater Master Plan (CWMP) identified projects for next 10 years and Modified Ludzack Ettinger (MLE) as best scoring placeholder for TIN Reduction 2021 3� 2022 1� 2023 3� 2024 1� Future 2019 - 2022 Steam Renovations Project: Detailed Condition Assessment, Comprehensive Asset Evaluation and Predesign on Steam, Secondary & Electrical I" Watershed Permit 2014 - 2019 2"d Watershed Permit 2019 - 2024 i 3rd Watershed Permit 2024 - 2029 I : 5W, Future Nutrient Management: 2023 - 2024 Planning, Design & MABR Pilot Construction V CENTRAL SAN omplete Aeration Basin Diffuser Replacement and Complete Project - Seismic Upgrades by Spring 2034 Planning Design Construction 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 41h Watershed Permit: 2029 - 2034 2026 - 2027 Consider 4th Watershed Permit before starting construction Full or Medium Scale Validation Testing (if necessary) of qq innovative technologiAN Compliance by Smaller capital projects can be constructed May - September 2035 earlier as needed d CENTRAL SAN Page 6 of 17 CWMP Placeholder Plan for Nutrient Removal If nutrient removal were required for a recycled water project (i.e., Water Exchange) or regulatory requirement, :=—dlC— MLE* is the placeholder process Benefits f ;roam. i 0 d�.arc Established and proven treatment process • Challenges Significant construction effort for contaminated soil relocation/removal and new secondary clarifiers and aeration - tanks Completing maintenance in dry weather season (May -October) would require - adding new staff or seasonal contractors *MILE process increases the solids retention time to allow bacteria who use nitrogen as a food source to grow. This requires more aeration tank volume and clarifiers to treat the same capacity. - Steam and Aeration Blower System Renovations, DP 7349 Paved the Way for Secondary Process Improvements Vision to Maximize Value of Existing Secondary Process Planning Identified Asset Replacement based on drivers: • Aging Infrastructure • Capacity • Regulatory • Sustainability/Optimization Design Developed plan to maximize the capacity of existing tanks if nutrient removal were needed and avoid stranded assets Membrane Aerated Bioreactors identified as technology that could intensify treatment in existing tankage (i.e., do more Construction Electric Blower Improvements, DP 100015 - Completed Aeration Basin Diffuser Replacement and Seismic Upgrades, DP 100019 - In Construction September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 13 of 26 5 Page 7 of 17 Process Configuration after Current Projects are Completed Electric Blower Improvements Project, DP 100015 Full redundancy for air supply to tanks with new electric blowers t I . _ ITI lr�'j .._Ir; s ❑ Aerobic Zone 1 ` Anaerobic SwingI i Zone `I North Selector l El South Selector Basin fA11B is �� II L ration only own for clarity. Allbasins nfigured in similar pattern r lm m&Jiw rk= k=%O bi= t­ r Aeration Basin Diffuser Replacement and Seismic Upgrades, DP 100019 Replace aged diffusers with state-of-the-art membrane diffusers for improved efficiency and performance Rehabilitate south selector to allow for north selector to be taken offline for rehabilitation and allow for new treatment configuration Recent preliminary cost update to the CWMP alternative estimates the cost of an expansion with conventional MLE configuration at -$665 million Wastewater o 0 0 from ao° o Ultraviolet Collection ° , o ° ° o Disinfection System Primary Anaerobic Then Recycled Water Headworks Clarifiers 4 Aeration Secondary or Outfall to Suisun (4) Anoxic Tanks Clarifiers Bay Scrubbed Flue Gas to 1 Selector* (448) (8 4 10) Atmosphere Return Activated Sludge Ash to Beneficial Reuse Waste Activated Dewatering Sludge *Anaerobic Selector is mixed but with no aeration or dissolved Return Flows to Plant and Incineration oxygen. Anoxic selector would be mixed with no aeration but would have nitrate available that contains oxygen. $z i September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 14 of 26 6 Page 8 of 17 Central San is exploring Process Intensification Technologies Conventional (i.e., MLE) Intensification Conventional + Intensification Intensification of existing infrastructure is preferred. However, being able to reliably meet treatment objectives will depend on regulatory limits and technology performance. MABR Pilot - Influent Water Test Feed Locations MABR Cassette Potential Locations Wastewater from ° o o o l Ultraviolet o 0 0 o ° Disinfection Collection ° o o o° o Q o° o o System Primary Anaerobic Then Recycled Water Headworks Selector Aeration Secondary or Outf Suisun Clarifiers B Bay (4) Tanks Clarifiers Scrubbed Flue Gas to Atmosphere Return Activated Sludge Activated _L�J--Waste Dewatering Sludge MABR Pilot Feed Locations and Incineration Q Phase 1 - Secondary Clarifier Influent N/ © Phase 2 - Anaerobic Selector © Phase 3 - Aeration Tank September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 15 of 26 Page 9 of 17 MABR Results are Promising Initial Pilot Questions: Can nitrogen removing bacteria live on the MABR when being fed with Central San bacteria that do not remove nitrogen? Will nitrogen removal be similar at Central San to treatment plants that already remove nitrogen? Can the nitrogen removing bacteria grow in the presence of cyanide from the incinerator air pollution control equipment? What is the full-scale installation cost? MABR Next Steps The Nutrient Management Planning and Predesign Project will: Refine the final design criteria Estimate costs r■N'q� �,�^_k illy: Consider other potential technologies to use in combination or parallel Complete a business case evaluation I �� Explore if full-scale testing is recommended Full-scale MABR Install example from equipment vendor Veolia September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 16 of 26 8 Page 10 of 17 The new diffusers (in construction) were designed to operate as part of a nutrient removal treatment plant. Additional tanks would be needed if using a conventional treatment configuration like MLE September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 17 of 26 9 Page 11 of 17 Commissioned New Electric Blowers for Full Redundancy and Parallel Operation with Steam Blowers Coordination is needed with final design of a new Substation that will simplify and modernize the overall electrical architecture with flexibility for future demands •• 0• „-- 1 mac- yr: -i✓ /irrn u September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 18 of 26 10 Page 12 of 17 New Ultraviolet (UV) Disinfection System Final Design is Underway The new UV Facility will be built east of the South Clarifiers and designed to increase wet weather capacity by 40 million gallons per day (MGD) to 140 MGD. The existing UV tankage can be repurposed for nitrogen removal. Therefore, this project schedule could become very important. The completion of Solids Handling Facility Improvement (Solids Project) - Phase 1A is critical to make space available for the new UV Facility and potential new tanks for nutrient removal 2r 2 I r i ti� { O • 2r COMPLETED SLUDGE TANK COVER 22 PROJECTS BLENDING/ REPLACEMENT STORAGE 4 5 7 3 p 6 8r 000 08000 MULTIPLE HEARTH AIR POLLUTION CONTROL ASH HANDLING ANDLOADOUT ELECTRICAL NEW ELECTRICAL RENOVATION CENTRIFUGE DEWATERING SCB SEISMIC RETROFIT— Solids Control SCB SEISMIC Building (SCB) RETROFIT - FURNACES CONSTRUCTION SYSTEM SHEAR WALLS BUTTRESSES Redesign (r( September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 19 of 26 11 Page 13 of 17 Solids Project - Phase 2 Developed Central San's long-term solids management strategy for the next 30 years to reserve space for both solids and nutrient future facilities Af flap proaeef—Eer kl ,M m p aqg Nr gh Ne fTeu2 ew1ue llpyerea ditan nileria were IaenUfid hexdpn rrodud pepfatnn eM tmEing prpJepVern A merkel efeesemenr, keepwq whla bwrflc:oi esas in nmb. wm ce�dvc4otl Do iaeruiN tH pelenhN uses. ras¢.s Nd tests }n tla NVJ seeds p-d M1pnrly vnrlpua aellds vpennsnt nnomay. rs. ['epU end 08M pray end h—.fRaMfm wore dwrc -d ro comp ro nI[ nlly lrheeltgrnelh� wM 9�et Vnr .BmeTrtfCostcores are Wing furC.e+ a ur W pn-rg metonpiertn SYprepy wre repommprq tlq path for Ore I replpnrnyrrr craw mylr.pla hpehrt furnx�s . Fudher reRnemen[ 1 it . Started from pl heslscming � r Idecll'led end toes 1rt2 universe alternalive5 BnC tO` of at[Plad11'res consideration • Flow and nudge eIr . FyaluisGed seven or when to start Iwd updO, solids handliltg anemalhres in Ph858 d D"gt -Negulatory treatment moredetall and Cm ULKtion evateallon [i.e. wrrentyas+>) - ln[afporated peer • Ranetvetl feylewcammff - regiorW curls and , Ad—d nest • mdflret trends mwo g alrerat*res to phasing evalualipn 23 Ho Updatw ion9-term r strategy...- ,y September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 20 of 26 12 Page 14 of 17 Develop Central San's Optimal and Adaptable Nutrient Management Strategy Intensification MABR & Densification Water Reuse of Treatment Partnerships Systems Performance D.. 4 M-- 0' Project Objectives Identify viable nutrient mitigation alternatives to assist Central San in selecting an optimal solution Consider various potential recycled water opportunities Maximize the value of existing assets 1 Develop an optimal project phasing, schedule, and delivery plan that has the least impact on Central San's operations and ratepayers Update the Board's Recycled Water Policy Develop a Predesign Report including site layouts of the selected alternative �J September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 21 of 26 13 Page 15 of 17 Consider Recycled Water Opportunities The Nutrient Management Planning and Predesign Project will: Develop a roadmap that is flexible enough to incorporate potential large-scale recycled water opportunities, such as partnering with Contra Costa Water District to serve the Martinez refineries Evaluate all the potential ways Central San's Recycled Water Program can be expanded Irrigation of Central San's overflow basins and properties Economic incentives for increased use and new connections in Zone 1 Expanding the existing program into new areas Draft Task List Develop population and TIN projections, review and summarize existing information, and develop planning basis Evaluate Innovative Nitrogen Removal Technologies Include site tours for full-scale MABR facilities in operation and any other promising innovative technologies Plan for piloting innovative technologies Evaluate Available Treatment Plant Land Use Consider areas of the treatment plant where new facilities could be constructed with and without disturbing the contaminated soil cap Coordinate with on -going analyses by other consultants Existing Facility Evaluation Determine needed improvements to existing facilities to address deficiencies associated with operating at higher solids retention time (i.e., scum and foam trapping, dissolved air flotation thickening capacity/performance, etc.) Complete condition assessments and comprehensive asset evaluations as required September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 22 of 26 14 Page 16 of 17 Draft Task List Continued Evaluate Expanded Use of Recycled Water Consider ways to incentivize new recycled water connections and increase usage by current customers in Zone 1 Consider expansion of the existing distribution system, including irrigation of Central San's wet weather basins and buffer properties 6. Evaluate Potential Synergies with Mt. View Sanitary District 7. Alternatives Analysis and Business Case Evaluation Existing facility upgrades/retrofits New secondary process and ancillary facilities Recycled water and nature -based solutions Project Delivery Method Evaluate and hold workshops on alternative project delivery methods Draft Task List Continued Project Schedule and Phasing Evaluation Develop robust project schedule for nutrient removal facilities to be fully operational by spring 2034 (1 year prior to required compliance) Develop an optimal project phasing schedule to have the least impact on Central San's operations and ratepayers 10. Recommend Updates to the Board's Recycled Water Policy 11. Develop Nutrient Management Strategy Roadmap and Preliminary Design Report including site layouts M_ pt�, Final Design and Engineering Services During Construction (asking consultants not to include a fee for task 12) ` September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 23 of 26 15 Page 17 of 17 Tentative Request for Proposal Schedule and Fee Estimate Request for Proposal Issue Date: September 2024 , Consultant Notice to Proceed: January 2025 Completion Date of Task 1 - 11: February 2027 Estimated Fees for Task 1 - 11: $3,500,000 Peer Review Team Fees: $400,000 September 12, 2024 Special REEP Committee Meeting Agenda Packet - Page 24 of 26 16