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Covered Anaerobic Digester

Covered Anaerobic Digester. Developing an Environmental Management System (EMS) Approach for Agriculture and Agribusiness Dec. 18, 2000. Julian Barham Barham Farms Zebulon, NC. Case Study - Barham Farm. Located - Johnston County, NC modern swine farm populated in 1994

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Covered Anaerobic Digester

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  1. Covered Anaerobic Digester Developing an Environmental Management System (EMS) Approach for Agriculture and Agribusiness Dec. 18, 2000 Julian Barham Barham Farms Zebulon, NC

  2. Case Study - Barham Farm • Located - Johnston County, NC • modern swine farm • populated in 1994 • owned and managed by Julian and Elaine Barham

  3. Background Information • 4000 sow - farrow to wean • 4 gestation barns • 2 farrowing barns • slatted floors (grates) • shallow pit/recharge • flush pit 4/8 day cycle • waste gravity flow

  4. Process Diagram

  5. 1994 - 1996 Effluent from barns to anaerobic lagoon • 40,000 gallons/day (total solids < 1.0%) • lagoon surface = 6 + acres

  6. Traditional Anaerobic Lagoon Design Evaporation Emissions Field Application Freeboard Rainfall/Storms Storage Treatment Sludge

  7. Covered Anaerobic Digester ? • Odor Control • Energy Resource • Ammonia Emissions • Rainfall Exclusion (*)

  8. Anaerobic Digester and Storage pond Biogas Rainfall Digester effluent Treatment Sludge Anaerobic Digester Storage Pond

  9. Lagoon Cover Design lower cost (?) rainwater into lagoon odor reduction high maintenance • partial cover ? • bank to bank ? rain exclusion no emissions (sealed) biogas storage low maintenance

  10. Partial Cover - Practical Application !

  11. Bank to Bank Cover - Practical Application

  12. Things Involved Biogas • Methane + CO2 + H2S • Greenhouse gas Options • Flare • IC Engine • Micro Turbine • Burner/Boiler

  13. Equipment Needed Boiler for hot water - 10,000 gallon hot water storage - hot water for space heating and mats Engine for co-generation - 120 KW for peak shaving - engine heat recovery - hot water

  14. Lagoon Performance

  15. Covered Anaerobic Digester Effluent Organic Carbon - reduced 85% TKN - reduced 30% Total P - reduced 75% K - reduced 20% Ref: ASAE Proceedings 8th InterNatl Symp. Oct 2000 Eval. of Alternat. Waste Sys.

  16. Digester Effluent Use: Apply at agronomic rate to low value hayland!

  17. Digester Effluent Use: Nutrient rich for high value produce in green house environment!

  18. Benefits Seen Biofilter - low energy input process Reduce Ammonia Emissions (NH4 to NO3) Lower pH

  19. Greenhouse

  20. Other Results and Conclusion It’s not “A Sows Ear to a Silk Purse” but Demonstrated Energy Resource Reduced Emissions Marketable Produce Manageable System ?

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