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Source Separated Organic Materials Anaerobic Digestion Feasibility Study Prepared for Ramsey/Washington Counties Resource Recovery Project Board And the.

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Presentation on theme: "Source Separated Organic Materials Anaerobic Digestion Feasibility Study Prepared for Ramsey/Washington Counties Resource Recovery Project Board And the."— 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 v Review AD processes & current development v Examples of large scale AD plants v Option for biogas generation and use v Energy market status v Availability/composition of SSOM in metro area v Facility Design Considerations v Permitting and Environmental Considerations v Economic Analysis v Schedule

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

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

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

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

7 Estimated SSOM and Yard Waste As Disposed Material TypeResidential (tons) Commercial (tons) TOTAL (tons) Source Separated Organic Material 189,000200,000389,000 Yard Waste (+Smaller Wood Waste) 47,00013,00060,000 TOTAL236,000213,000449,000

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

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

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

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

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

14 Economic Analysis v Capital costs System vendor response lacking Published sources Plant build up estimate v O&M costs Published Plant build up v Revenues

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

16 Economic Analysis v 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) v Anticipated Tip Fees Debt Service estimated at $30 per ton Estimated Net cost per ton $55-$60

17 Schedule v Siting3 - 6 mo v Funding mo v Prelim engineering3 mo v Permitting mo v Construction mo v Startup/commissioning3 - 4 mo v Total42 – 57 mo

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