1 / 18

Source Separated Organic Materials Anaerobic Digestion Feasibility Study

Source Separated Organic Materials Anaerobic Digestion Feasibility Study. Prepared for Ramsey/Washington Counties Resource Recovery Project Board And the St Paul Port Authority By Foth Infrastructure & Environment. Scope. Review AD processes & current development

jensen
Download Presentation

Source Separated Organic Materials Anaerobic Digestion Feasibility Study

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Source Separated Organic Materials Anaerobic Digestion Feasibility Study Prepared for Ramsey/Washington Counties Resource Recovery Project Board And the St Paul Port Authority By Foth Infrastructure & Environment

  2. Scope • Review AD processes & current development • Examples of large scale AD plants • Option for biogas generation and use • Energy market status • Availability/composition of SSOM in metro area • Facility Design Considerations • Permitting and Environmental Considerations • Economic Analysis • Schedule

  3. Definitions • Process to degrade organic material in the absence of oxygen. • Microorganisms transforming degradable organics into water, carbon dioxide, and methane • Degradable portion forms biogas • Non-degradable portion forms digestate

  4. State of the Technology • Most facilities used on MSW feedstocks are located in Europe • Anaerobic digestion of MSW sources not yet common in US • Report examined process types, technology suppliers, and selected vendors • Project focused on systems at 100,000 tpy

  5. Biogas Use Options • Direct use – typically provides best economics, requires user proximity • Electric generation – proven technology, scalable, renewable • Combined heat and power – benefits of both direct use and electricity • Fuel cells – unknown with AD of MSW or SSOM • Pipeline quality – treatment required, expensive

  6. SSOM Supply Assessment • Notable current recovery programs: • Backyard composting • Food waste direct to livestock • Food waste manufactured into animal feed • SSOM composting • Significant amount of SSOM still disposed in the mixed MSW waste stream

  7. Estimated SSOM and Yard WasteAs Disposed

  8. Facility Design Considerations • Originally intended to work with experienced system vendors to describe and develop cost estimates • Did not happen • Developed preliminary facility design assumptions and costs via building up components

  9. Facility Design Considerations • Process Flow & Scalability • Mass Balance • Receiving & Preparation • Processing • Site Needs

  10. Facility Design Considerations • Ideal = scalable & redundant (2 lines) • Conveyors, bag breakers, trommels, metal separation, shredder, blending tanks, digesters, gas conditioning, end use, digestate handling • Scalable – # of lines, # of digesters, etc • 21 days in digesters • Biogas yield of 400,000 to 525,000 MMBTUs per year • 165 tons per day of dewatered compost

  11. Site Needs • 8 acres • Digesters require high soil loading support • Utilities – electricity, steam, compressed air, sewer • Site security - typical

  12. Permitting and Environmental Considerations • No current AD facilities operating with MSW as a feedstock • Permit needs anticipated to include: • EAW • EIS • Emissions: air, water, solids • Other Federal, State/MPCA • Local • PUC

  13. Economic Analysis • Capital costs • System vendor response lacking • Published sources • “Plant build up” estimate • O&M costs • Published • Plant build up • Revenues

  14. Economic Analysis • Capital costs – published sources • Adjusting for scope, cost range is $30M to $45M for 100,000 tpy facility • Capital Cost – Plant Build Up • $38,580,000 • O&M Published Sources • Typical $20 to $60 per ton • O&M Plant Build Up • $53/ton for direct use option • $58/ton for electrical generation option

  15. Economic Analysis • Revenues • Electrical generation: >$3M/yr or $30/ton (assuming $0.06/kWh) • Biogas sales: $2.28M to $4.24M/yr or $23 to $42/ton (assuming $6-$8/MMBTU) • Anticipated Tip Fees • Debt Service estimated at $30 per ton • Estimated Net cost per ton $55-$60

  16. Schedule • Siting 3 - 6 mo • Funding 3 - 9 mo • Prelim engineering 3 mo • Permitting 12 -15 mo • Construction 18 - 20 mo • Startup/commissioning 3 - 4 mo • Total 42 – 57 mo

More Related