Oregon's Methane Venture - Experience and Potential

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Tidal pond fluids blended with water and flooded onto field corn. Solids are sold off the ... Reusing tidal pond fluids through separator when not utilized for digester ...

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Slide 1

Oregon's Methane Project - Experience and Potential Mike Gamroth Oregon State University Dept. of Animal Sciences

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The procedure Anaerobic assimilation – like the rumen Longer maintenance Methane gathering Methane utilize Heat, boiling point water Combustion motor power "Methane digester"

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Basic ideas Decomposition of natural material without oxygen environment Numerous strains of microorganisms Biogas Methane 50-80% CO 2 20-half Other gasses

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Ambient temperature Covered tidal pond Lowest yield Mesophilic Around 100º F More sympathetic Thermophilic Highest yield, bring down maintenance time

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Digester sorts Plug stream Suited to scratched compost Most basic on dairies Long rectangular tanks Heat included, in-ground or protected Retention time (RT) 15 to 20 days

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Digester sorts Complete blend Typically upright round tanks Benefits from standard sustaining Can deal with "wetter" excrement When co-processing, blending vital

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Digester sorts Covered tidal pond Lowest cost, least complex to work Best suited to warm atmospheres, wet fertilizer Lowest gas yield Often will be "occasional"

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Digester sorts Biofilm Can increase any digester A place for bacterial movement Reduces maintenance time

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Economics 101 A thrifty digester framework can payback in 7 to 10 years Initial cost Operation costs Value of vitality, duty credits Other advantages – smell control, solids deals

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Benefits of absorption Generate vitality from biomass Odor decrease More promptly accessible nitrogen Pathogen lessening $65 $68 $80 $83

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Why there aren't more… Poor outline Lack of aptitudes, time Excessive support, operation time Diminishing returns after some time Lack of enthusiasm bankrupt EPA and Meyer, et al

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Keys to achievement Know your fertilizer quality Match the digester innovation with the excrement Select a tried plan and keep it straightforward Take preferred standpoint of impetuses Monitor the framework every day Line up operation and upkeep reinforcement

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Resources http://www.epa.gov/agstar/index.html Our venture: Energy Trust of Oregon Beef Council Oregon Dairy Farmers Association Amanda Green (360) 751-4190

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An organization of Cal-gon Farms and Portland General Electric

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The framework Scraped excrement Piston pump to encourage Digester gushing through a fasten squeeze screen Liquids put away tidal pond Solids in secured shelter

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Uses Lagoon fluids blended with water and inundated onto field corn Solids are sold off the homestead and utilized as bedding Recycling tidal pond fluids through separator when not utilized for digester

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Research extend Questions about the ranch's supplement adjust Questions about the start-up and adjustment of the digester Received cash from an allow program to test the digester amid start-up and for a two month duration amid operation Evaluate solids as a dirt revision

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Ending Svc Date kWh # Days Avg kWh/day 5/30/2002 8527 31 275 7/30/2002 12301 32 384 8/29/2002 14817 30 494 9/28/2002 17886 30 596 10/29/2002 23115 31 746 11/27/2002 19614 29 676 8/3/2003 271677 336 660 Electrical Output Cal-Gon Farms Biogas Project Generation Record (in light of PGE bills)

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Basic results

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Exporting solids to decrease supplement stacking 1 Average of 51 separators, Willamette Valley, 1995

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Solids plots

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DAF detachment 90%+ P evacuation