Resource Recovery at Post Point. Turning our waste into valuable resources

Transcription

1 Resource Recovery at Post Point Turning our waste into valuable resources July 31, 2017

2 AGENDA Project Overview Drivers Resource Recovery Summary of Community Feedback Preliminary Evaluation (TBL+) Results Outreach Goals and Wrap-up 2

3 PROJECT OVERVIEW 3

4 Post Point WWTP Improvements Required To Address The Aging Solids Stream Process Solids Stream Process incinerator (#1) built in 1972 Liquids Stream Process recently upgraded (2014) Opportunity for resource recovery 4

5 Solids Stream Project Drivers 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 longterm growth Are subject to increasingly stringent air quality regulations Brown and Caldwell 5

6 Resource Recovery 6

7 A Prime Opportunity Recover Resources at Post Point Brown and Caldwell 7

8 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 Process: Anaerobic digestion

9 How Are Biosolids and Biogas Produced? Schematic from Northwest Biosolids website at Brown and Caldwell 9

10 What Are Biosolids? Soil like - contains water, nutrients, 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 Brown and Caldwell 10

11 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 11

12 Beneficial End Use Biosolids Land Application Anaerobic Digester (King County Brightwater) Soil Amendment Brown and Caldwell 12

13 Biogas Use Biogas Cogeneration Anaerobic Digester (King County Brightwater) Pipeline Vehicle Fueling Station Brown and Caldwell 13

14 Proposed Location Of On-Site Improvements At Post Point Brown and Caldwell 14

15 Summary of Public Feedback Brown and Caldwell 15

16 May 2017 Community Workshop Feedback General support for moving away from incineration Interest in Class A, including local use All TBL+ categories important Numerous questions posed Brown and Caldwell 16

17 How Community s Feedback Was Used Feedback Move away from incineration (move toward resource recovery) Class A, including local use How Feedback Was Used Step 1 screening process validated continue with digestion based alternatives Focus on developing a Class A program All TBL+ categories important Step 2 TBL+ process validated Numerous questions posed Developed a FAQ Spring_BellinghamBiosolids_FAQs_Final_v2.pdf Brown and Caldwell 17

18 Preliminary TBL+ Results Brown and Caldwell 18

19 Post Point Biosolids Alternatives Were Evaluated Using the TBL+ Framework 2-Step Process 1 2 High level screening of potential alternatives TBL+ evaluation of most feasible alternatives Brown and Caldwell 19

20 1 Screening Resulted in Four Conceptual Alternatives that are Digestion-Based

21 The Resource Recovery Project Will Be Guided By City s Legacies and Strategic Commitments TBL+ Criteria Environmental Social Financial Technical Brown and Caldwell 21

22 2 TBL+ Criteria Measure Desired Outcomes 22

23 2 Comparison of Preliminary TBL+ Results

24 Highest Scoring Alternative 3 Aligns with City Values and Offers Significant Benefits Benefits Best Environmental Competitive in Social, Financial, and Technical/ Functional Class A product available for local use Diversified end use options with Class A Brown and Caldwell 24

25 Phase 2 Of Study Will Refine Alternative 3 Type of anaerobic digestion system Assess potential off-site locations Biogas use Local market use Refine facility layouts Further assess impacts and phasing Use TBL+ framework Brown and Caldwell 25

26 OUTREACH GOALS AND WRAP UP Brown and Caldwell 26

27 Public Outreach Will Inform the Process 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 27

28 Expected Project Schedule : Permitting and Design : Construction Brown and Caldwell 28

29 How You Can Stay Involved Share your feedback by Friday, August 11 - Complete tonight or mail back - Complete online Join the project listserv Visit the website Brown and Caldwell 29

30 Questions? Brown and Caldwell 30