Design of scalable biogas digester for the developing world
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Design of Scalable Biogas Digester for the Developing World. By: Tiffany Cheng, Thomas Davis Dawn Schmidt, Kyle Schroeder, Andrew Wu BME 272 1/21/10 Advisors: Dr. Dave Owens – Owen Graduate School of Management Dr. Paul King – Vanderbilt University School of Engineering. Meet the Rezas.

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Design of Scalable Biogas Digester for the Developing World

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Design of Scalable Biogas Digester for the Developing World

By: Tiffany Cheng, Thomas Davis

Dawn Schmidt, Kyle Schroeder, Andrew Wu

BME 272

1/21/10

Advisors:

Dr. Dave Owens – Owen Graduate School of Management

Dr. Paul King – Vanderbilt University School of Engineering


Meet the Rezas

  • 6 members

    • Two parents, four children

  • 1 cow

  • Make $60 per month

  • Spend $10 on petroleum fuel per month

  • Spend 2 weeks per year collecting additional fuel

  • Interested in neighbor’s biogas digester

  • To improve their standard of living


What is a BioGas Digester?

1kg manure  360L of biogas

(~enough to cook for 1 person for 1 day)

(Saubolle & Bachmann, 1983)


Neighbor’s Digester

  • Cost $200

  • Expensive materials

  • Hard to install

  • Requires specialist


Design Criteria:

  • Costs $80 or less

  • Produces 2800 liters of biogas/day

    • 15,000 Kcal

    • Cooks for 6 people

  • Lasts at least 5 years

  • Easy to install


Design Method


Design Method


Biogas Digesters Worldwide

  • Floating Drum

  • Egg Shaped

  • http://www.water-technology.net/projects/reading_sewage/images/Island-Road-2.jpg

  • http://www.snisd.org.cn/images/05126b.JPG

  • Fixed Dome

  • Plastic Bag

http://www.saintsfarm.org/photos/biogas_digester_2_large.jpg

http://www.inforse.dk/asia/images/M_III_biogas3.jpg


Our Full-Scale Designs

Brick Design

  • Masonry and cement

  • Readily available materials

  • Requires sealant

Plastic Design

  • Polyethylene

  • Easier to install

  • Mass producible

http://www.journeytoforever.org/biofuel_library/methane_nepal.html


Selection Matrix:

Material for Digester


Testing Prototypes

Testing the effects of:

  • Stirring

  • Heating by compost

  • Changing material type

    • Brick

    • Plastic


Brick Prototype

3.5u

Dome

V = 151.37u3

10.1u (add 0.1u)

V = 825u3

Wall

Floor

10.2u (add 0.1u)


Plastic Prototype (Bucket)

4.2u

V = 151.64u3

1.5u

V = 825u3

10.1u (add 0.1u)

10.2u (add 0.1u)


Future Work Timeline

  • Talk to technicians and receive feedback from Bangladesh (Pricing)

    • Jan 21-Jan 28

  • Determine thickness of plastic

    • Jan 29-Feb 4

  • Obtain materials and site location

    • Jan 29- Feb 4

  • Detail design of prototypes

    • Feb 5-Feb 11


Cont.

  • Build prototypes for testing

    • Feb 12-Feb 18

  • Begin digestion

    • Feb 19- March 4

  • Detail the design of full scale digester

    • Feb 19-March 4

  • Obtain experimental data

    • Feb 19-March 4


Additional Citations

  • Saubolle, B., & Bachmann, A. (1983). Fuel Gas from Cowdung. Kathmandu: Sahayogi Press.


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