Resource Recovery at Post Point: Turning Waste into Valuable Resources
Post Point WWTP is undergoing improvements to address the aging solids stream train incinerator and explore opportunities for resource recovery through anaerobic digestion. The project aims to recover resources, minimize social impacts, and meet climate action goals by utilizing biosolids and biogas production processes. By transitioning from incineration to anaerobic digestion, the project hopes to create a reliable, safe, and environmentally friendly waste management system while complying with regulations and fostering innovation.
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Resource Recovery at Post Point Turning our waste into valuable resources
Post Point WWTP Improvements Required To Address The Aging Solids Stream Train Solids Stream Train Solids Stream Train incinerator (#1) built in 1972 Liquids Stream Liquids Stream Train Train recently upgraded (2014) Opportunity for resource recovery resource recovery 3
Solids Stream Train Project Drivers The incinerators The incinerators Are both past their design life Are expensive to repair and maintain Burn residual solids (resources) rather than recover them Do not recover heat Have limited capacity for long- term growth Are subject to increasingly stringent air quality regulations Brown and Caldwell 4
POST POINT RESOURCES AND ALTERNATIVES Brown and Caldwell 5
A Prime Opportunity Recover Resources at Post Point Brown and Caldwell 6
Pass/Fail Criteria Resulted in Anaerobic Digestion Based Alternatives Meets regulations Proven process and allows for innovation Reliable Safe working environment Meets Climate Action Plan (resource recovery) Minimizes social impacts Solids Stabilization Solids Stabilization Process: Process: Anaerobic digestion Anaerobic digestion
How Are Biosolids and Biogas Produced? Schematic from Northwest Biosolids website at www.nwbiosolids.org Brown and Caldwell 8
What Are Biosolids? Made mostly of water, organic matter, and microorganisms Treatment of biosolids determines end use Class A Extremely low pathogen levels. Approved for home gardens, parks, etc. Class B 95% removal of pathogens. Approved for use on agronomic crops (i.e., wheat) Schematic from Northwest Biosolids website at www.nwbiosolids.org Brown and Caldwell 9
Beneficial Use of Biosolids Is a Well Established Practice That Has Numerous Benefits Nutrients Crop yields Organic matter Soil structure (tilth) Water retention Brown and Caldwell 10
Anaerobic Digestion Based Alternatives Align Well With City s Selection Criteria Brown and Caldwell 11
Anaerobic Digestion Based Alternatives Align Well With City s Selection Criteria Brown and Caldwell 12
Beneficial End Use Biosolids Biosolids Land Application Land Application Anaerobic Digester Anaerobic Digester (King County Brightwater) Soil Amendment Soil Amendment Brown and Caldwell 13
Biogas Use Biogas Biogas Cogeneration Cogeneration Anaerobic Digester Anaerobic Digester (King County Brightwater) Vehicle Fueling Station Vehicle Fueling Station Brown and Caldwell 14
Proposed Location Of On-Site Improvements At Post Point Brown and Caldwell 15
We Will Look For Opportunities to Integrate Project With Other City Needs Synergy with Natural Resources office space improvements Consolidation of staff and functions at a new facility Environmental education services The Natural Resources Department office space is not adequate to serve needs Brown and Caldwell 16
EVALUATION PROCESS Brown and Caldwell 17
A Preferred Alternative Will Be Selected Using a 2-Step Process That Directly Links To City Values High level screening of potential alternatives (pass/fail) 1 TBL+ evaluation of most feasible alternatives 2 Brown and Caldwell 18
The Resource Recovery Project Will Be Guided By City s Legacies and Strategic Commitments TBL+ Criteria TBL+ Criteria Environmental Environmental Social Social Financial Financial Technical Technical Brown and Caldwell 19
TBL+ Criteria Measure Desired Outcomes Environmental Environmental (Healthy Environment) (Healthy Environment) E1 Minimize Carbon Footprint E2 Protect Air Quality E3 Maximize Resource Recovery E4 Minimize Energy Usage E5 Protect Local Habitat Financial Financial (Quality, Responsive Services, (Quality, Responsive Services, Vibrant Sustainable Economy) Vibrant Sustainable Economy) F1 Optimize System Value F2 Maintain Affordability F3 Minimize Market Sensitivity Social Social (Sense of place, (Sense of place, Safe and Prepared Community) Safe and Prepared Community) S1 Minimize Noise S2 Minimize Odor S3 Minimize Truck Traffic S4 Minimize Visual Impacts S5 Minimize Toxin Exposure Technical Technical (Quality, Responsive City Services) (Quality, Responsive City Services) T1 Proven Reliability T2 Minimize Post Point Impacts T3 Maintain Flexibility T4 Minimize Complexity 20
OUTREACH GOALS AND WRAP UP Brown and Caldwell 21
Public Outreach Will Inform the Process Outreach Program Goals Outreach Program Goals Inform residents and stakeholders Engage stakeholders to validate alignment with values Link decisions to Legacies and Strategic Commitments Create project ambassadors Avoid surprises frequent communication Identify a community-supported project 22
Expected Project Schedule 2017 2017 2018 2018- -2020: 2021 2021- -2023 2020: Permitting and Design 2023: Construction Brown and Caldwell 23
How You Can Stay Involved Share your feedback by Friday, June 2 Complete tonight or mail back Complete online Community meeting: early summer TBL+ screening results Emerging preferred alternative(s) Your feedback needed! Join the project listserv Visit the website Friday, June 2: Brown and Caldwell 24
