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Assessing Project Feasibility System Stability using AQUASIM

Assessing Project Feasibility System Stability using AQUASIM. Claire Allen March 10, 2009. Canadian Farm and Food Biogas Conference and Exhibition. Outline . Project Feasibility (substrates) AQUASIM Why use a computer model? Matching program to lab data Case Studies Manure & FOG

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Assessing Project Feasibility System Stability using AQUASIM

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  1. Assessing Project FeasibilitySystem Stability using AQUASIM Claire Allen March 10, 2009 Canadian Farm and Food Biogas Conference and Exhibition

  2. Outline • Project Feasibility (substrates) • AQUASIM • Why use a computer model? • Matching program to lab data • Case Studies • Manure & FOG • Stillage only • Manure & Potatoes • Conclusion • Biogas isn’t just for farms! • AQUASIM is a useful tool to reduce costs

  3. Project Feasibility The following factors are considered when analyzing project feasibility: • Farm Profile • Grid Connection • Economic Factors • System Stability

  4. System Stability: Co-digestion • Co-digestion refers to the use of off-farm materials in a biogas system • Co-digestion can increase: • biogas production and energy yields • economic yields • Co-digestion can potentially decrease overall system stability • A wide variety of organic wastes are suitable for digestion

  5. System Stability: Energy Yields • Cow manure yields ~ 40 m3 biogas/ton • Typical co-substrates • Fats, Oil, Grease (FOG) yields 200-400 m3 biogas/ton • Source Separated Organics yields 100-300 m3 biogas/ton • Anaerobic digestion as waste management in more than just the farming industry

  6. Addition of Co-Substrates How do you know the co-substrates will function in a digester? • Build a digester and cross your fingers • Lab tests • Literature Research • Computer Modelling

  7. AQUASIM • A computer program designed to identify and simulate aquatic systems • IWA Task Group for Mathematical Modeling of Anaerobic Digestion Processes • Anaerobic Digestion Model (ADM) • Activated Sludge Model (ASM) • Model has been calibrated with field and lab data

  8. Cow Manure & FOG • Typical digester set-up • Experimental data from a client • 15 m3/day manure • 3 m3/day FOG • Our model matches initial data but we still have some analysis to do

  9. Manure & FOG pH 500 m3 digester 15 m3 manure/day 3 m3 FOG/day pH 7.4

  10. Manure & FOG Biogas 1100 m3 biogas/day manure only: 460 m3 biogas/day

  11. Manure & FOG COD 45 kgCOD/m3 6 kgCOD/m3

  12. Manure & FOG Acid 260 mg/L

  13. Manure & FOG Overload pH 7

  14. Stillage

  15. Stillage - pH pH was adjusted after 60 days

  16. Stillage Biogas

  17. Stillage - TCOD and SCOD

  18. Manure & Potatoes • This case study includes: • Dairy Manure: 3000 m3/day • Potatoes: 5500 m3/day • Starch: 1000 m3/day • Secondary Cake: 8000 m3/day • Grease: 150 m3/day • System that is high in carbohydrates, must be careful with pH

  19. Manure & Potato pH pH 7.4

  20. Manure & Potato Biogas 3250 m3 biogas/day

  21. Manure & Potato Biogas

  22. Manure & Potato Acid 70 mg/L

  23. Conclusion • System stability is a vital part of overall project feasibility • The use of a computer model allows us to analyze possible system digester configurations

  24. QUESTIONS? CH-Four Biogas Inc. 107-1390 Prince of Wales Dr. Ottawa, ON K2C 3N6 T: 613 224 8308 F: 613 224 1642 info@chfour.ca www.chfour.ca

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