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Design of an Anaerobic Digester and Methane Collection

Design of an Anaerobic Digester and Methane Collection. Presented on Wednesday August 10 th , 2005 By: Nick Delozier, David Goodnack, Ryan Mattern, and Dane Schneider. Group 6. Engineering Design & Graphics 100. Neueva Esperanza. Community 114 Homes 514 residents Animal Life 123 cows

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Design of an Anaerobic Digester and Methane Collection

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  1. Design of an Anaerobic Digester and Methane Collection Presented on Wednesday August 10th, 2005 By: Nick Delozier, David Goodnack, Ryan Mattern, and Dane Schneider Group 6 Engineering Design & Graphics 100

  2. Neueva Esperanza Community • 114 Homes • 514 residents • Animal Life • 123 cows • 22 horses • 45 pigs Climate • Rain Season between May and October • Average temp. Between 79-89 degrees F

  3. How Anaerobic Digestion Works

  4. Table of Contents • Mission Statement • Approach • Concepts • Final Design Concept Development Process Mission Statement Development Plan Identify Customer Needs Establish Target Specifications Generate Product Concepts Select Product Concept(s) Plan Downstream Development Perform Economic Analysis Benchmark Competitive Products

  5. Mission StatementAnaerobic Digester with Methane Collection • Product Description • Self Sustaining, efficient Anaerobic Digester able to collect methane. • Key Business Goals (Objectives) • Convert Manure into Methane • Clean, deodorize, and reduce amount of sludge • End up with better fertilizer or animal feed additive • Primary Market • Nueva Esparenza • Secondary Markets • Farmers • Assumptions • Self Sustainable • Durable • Inexpensive • Collect Methane • Stakeholders • Small community • Farmers

  6. Approach • Recognition of Need - Market Pull & Technology Push • Definition of Problem • Gathering Information • Conceptualization - Brain Storming • Communication of Design

  7. Full Process

  8. Collection • Gathering Human waste • Each house responsible for collection and depositing waste at designated locations • Gathering Animal Waste • Centralized feeding location • Transporting waste to digester location • Use either tractor or some type of cart

  9. Mixing Process • Deposit collected waste in mixing tank • Add water to achieve desired slurry concentration of 12% • Begin mixing using animal powered mixer • Open valve to release mixer contents into desired trench

  10. Mixing Tank

  11. Digester Concepts Plug Flow Digester Lagoon Digester Complete Mix Digester Temperature-Phased Anaerobic Digestion

  12. Digester Screening

  13. Weighted Screening

  14. Design Screening

  15. Weighted Screening

  16. Digester Animation

  17. Dimensions

  18. Hypalon Reservoir Liner

  19. Connecting Tanks and Drainage • Use scheduled 21 PVC pipe to connect mixing tank to digester unless • Fernco adapter to connect pipe and tank • Butterfly valves to control flow • System of french drains to eliminate water build up under liner with 6” pipe directing excess water away from digester trench

  20. Building the Digester System • Trenches will be dug by hand • Jersey barriers will be placed around perimeter to elevate liner during flooding • Either prefabricated or built on site

  21. Jersey Barriers Jersey barriers will be placed around perimeter of digester and storage lagoon to elevate liner during flooding. They will be either prefabricated or built on site.

  22. Temperature Inside Digester • Between 90 and 100 degrees F • Mesophilic (95 to 105 degrees F) • Thermophilic (130 Degrees F) • Pathogens removed during process include E. Coli, Salmonella and Cryptosporidium • Odor reduced

  23. Collecting Methane

  24. Cleaning Methane • Collected methane filtered though iron nails to remove hydrogen sulfide • Ready to use methane will leave filter to be burned

  25. Cost • Operation and Maintenance • 70 watt fan powered by methane (Free) • Nails or iron filings to filter methane

  26. Final Products • Amount of methane produced • Total methane produced = 966.11 cf/day • 467.18 cf/day from human waste • 498.93 cf/day from animal waste • Uses for effluent • Manure • Animal Feed • Sold

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