2. BIODIGESTER Conceptual Design Review December 7 th, 2009 EGGN 491

3. Team Members Keano DashkowitzFaculty Advisor: Lynlee GerkDr. David Munoz Alima Kopbayeva Elliot Makuh Jennifer Stevens Daniel Stewart

4. Clients Contact: Maria Camp Mission: “Into Your Hands improves rural communities of Uganda by developing financially sustainable solutions for affordable education.” Contact: Bob Miller Mission: “To improve the life and environment of orphans of any race, religion or gender throughout the world.”

7. Design biodigester system to provide Gas for cooking fuel Fertilizer for crops Look at community and residential size units Increase sustainability and use of green energy Project Objectives

8. Design Considerations Solid Retention Time Temperature pH Dilution – Reduce Ammonia toxicity Maintaining anaerobic state Production of Toxins

9. Anaerobic Digestion

10. Schematic Ground Level Gas Pipe

11. Concept Variants Design Variables – Tank dimensioning and geometry Hydraulic residence time is needed to be long enough for methane formers to grow – Cover material and type Anaerobic is necessary – Mixer use and type 10%-15% increase of gas – Grinder use and placement – Storage unit possibilities Effluent of gas and fertilizer – Gas burn-off mechanism Safety reasons

12. Design Criteria Amount of biogas produced Cost Safety Sustainability Cultural Acceptance

13. Storage

14. Mixers Paddle Mixer

15. Mixers Spiral Mixer

16. Top

17. Grinders Placement Before influent pipe Inside influent pipe

18. Shape

19. Patent Research Earliest Related US Patent: 1920 Interesting Patents – US Patent #3,981,803 (September 21, 1976) Basic Bio-digester – US Patent #4,100,023 (July 11, 1978) Four-chambered Bio-digester – US Patent #4,374,199 (February 15, 1983) Bio-digester with Magnetic Field – US Patent #6,361,694 (March 26, 2002) Improved Efficiency with Propane Injections

20. Decision mechanisms Pugh Chart Decision Matrix Brain Ball 6-3-5

21. Questions & Comments