Feasibility of Installation of Anaerobic Digesters at Cattle Operations and Demonstration of a...
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Transcript of Feasibility of Installation of Anaerobic Digesters at Cattle Operations and Demonstration of a...
FEASIBILITY OF INSTALLATION OF ANAEROBIC DIGESTERS AT CATTLE OPERATIONS AND DEMONSTRATION OF A DECISION SUPPORT TOOL April 4, 2013
Sybil SharvelleJeff Lasker
Catherine KeskeLucas Loetsher
Presentation Overview
Introduction to anaerobic digestion Feasibility problems in Colorado and arid West
region Online Decision Tool Developed by CSU
Anaerobic Digestion
High CarbonWaste
Organics Acids
Acids CH4
High NutrientLow OdorProduct
Anaerobic Environment
Cogeneration
Hot Water
CH4
Green Power
Near Complete Pathogen Removoal
Uses for Methane Biogas
Methane Gas
Cogeneration
Electricity Hot WaterPurification to Supply
Natural Gas Lines BoilerPurification
and Liquifaction
Benefits
Reduce greenhouse gas emissions Methane released from animal waste is captured Displacement of fossil fuels
Improved waste treatment Pathogen reduction Carbon removal
Odor control Renewable source of energy
Classic Lagoon Waste Management
Simple – Covered Lagoon
High Tech – Above Ground, Stainless Steel
AD Throughout US
Site Suitability
Digester temperature ideal at 35oC (98oF) Locations with cold winters are not ideal
Waste Quality Low solids content, < 17% solids Low inorganic content
Soil Rocks
Higher organic content, more energy content
Colorado – Cold Climate
Average Annual Minimum Temperature
Recommended Solids Content
Technology Recommended Waste
Solids Content
Covered Lagoon < 3%
Plug Flow 11 - 17%
Complete Mix 5 - 10%
Upflow Sludge Blanket 3 - 7%
Fixed Film
Dry Digestion
<3%
> 40%
Solids Content
Waste management practice impacts solids content Collection by flushing Concrete scrape Dry lot
Flush Collection
3-5% Solids
Scrape Collection on Concrete
Source: EPA AgSTAR
8-17% Solids
Dry Lot
Solids 20-90%
Colorado – Dry Climate
Average Annual Precipitation In Colorado
Need to Find Nearby Source of Wastewater or Add Groundwater to Waste
Problems with Dry Lot Collection
Dry scrape manure Contains rocks and sand Up to 80% TS in arid climate
Plug Flow
Slow, requires high retention time Typically loaded in batches on farm
Rocks and sand will Settle and Build Up
Complete Mix
Well mixed environment Slightly faster rate
of digestion than plug flow
High solids material can not be mixedSand/Rocks detrimental to moving parts
Technical Feasibility for AD
Technical Feasibility
Good
Technical Feasibility
Poor
Flush Dairy
Concrete Scrape Dry Lot
ADM Soybean Processing
Biodiesel Plant
Anaerobic Digester
Frito Lay
Hot Soybean Oil
Cold Soybean Oil
Hog Waste
Food Waste
BiodieselGreen Power
Codigestion: Planned Project in Indiana
Online Decision Tool Developed by CSU
http://www.erams.info/AD_feasibility/
Learn About AD
Determine Technical Feasibility
Determine Economic Feasibility
Select Appropriate Technology
Maintain AD System
1 2 3 4 5
Summary
AD can be a great waste management tool Care must be taken to ensure technical and
economic feasibility Online tool available for decision support
Acknowledgements
Colorado NRCS Colorado Agriculture Experiment Station Colorado Governors Energy Office
Questions???