Thurston County Biodigester Study September 16, 2015
AD Tech Assist Group (AD-TAG) • Thurston Solid Waste • Thurston Water Resources • LOTT Clean Water Alliance • Puget Sound Energy • The Evergreen State College Plus All Stakeholders
What is Biogas? Biogas is a natural substance produced by the anaerobic decomposition of organic waste
Biogas is Natural Biogas is Renewable
Basic Anaerobic Digester System Flow Diagram
Digester Revenue Streams 1 Methane energy: electricity or fuel 2 Surplus thermal heat 3 Tipping fees and/or avoided costs (landfill diversion) 4 Digester solids (fiber) = bedding, compost, RePeat 5 Liquid effluent = crop fertilizer and water 6 Liquid effluent = surplus nutrients = fertilizers 7 Renewable energy and/or fuel credits and carbon credits 8 Ecosystem services: water quality/quantity 9 Carbon dioxide? 10 Bioplastics?
Benefits of Digesters Revenue Cost-Reduction Stakeholders Risk Mitigation Other Enhancement or Avoidance • Excess electricity • Reduced or • Pathogen reduction • Odor control • Scrubbed biogas • Diversified revenue • Nutrient avoided: • Cow bedding Energy costs streams management • Compost Bedding fees • Contracted price • Expertise and Dairy • Food waste Fertilizer costs rates knowledge-building • Tipping fees • Public Producers • Carbon credits relation/Price premiums • Expansion opportunities • Digester sales • Reduced sales and • Broader client base • Consulting/education marketing costs Digester • Service and support Industry • Expansion opportunities • Rate payer programs • Reduced capital • Supporting (e.g., PSE’s “Green investment distributed, base Utilities Power” program) accessing new load energy energy inputs development • Supporting clean • Reduced disposal • Supporting waste Substrate energy development costs reduction Providers • Tax revenue from new • Avoided cost of • Greenhouse gas • Job creation Government businesses created environmental reductions cleanup
Washington Case Studies Edaleen Van Dyke Qualco Promus (development)
WSU Research on Biorefineries
Thurston Particulars Inputs-Feedstocks Outputs-Products • Limited dairy • Scale • Poultry • Green power or green • Food scraps fuel • Bedding or compost • FOG or other products • Food processing, • Natural fertilizers brewing • Environmental offsets • Seafood and credits • Institutional
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