Anaerobic Digestion


a. Goal
b. Benefits of the specific technology to the community
c. Local Availability
d. Regulatory or Industry Standards for Implementation of Technology
i. International Standards
ii. Local code enforcement

e. Description of Product (s) or Process (es) and its Functionality (Succinct but Detailed Enough)
f. Design parameters
i. Sizing
ii. Materials needed for Fabrication/ Construction of Technology
1. Various Options

iii.Other resources Needed for Implementation/ Use
  1. Construction Equipment
  2. Labor
  3. Technical Consultation
  4. Transportation Requirements
  5. Energy Requirements
  6. Space
  7. Spare Parts
  8. Time for Construction
iv. Technical Skills Required to Operate or Utilize
  1. Training Requirements
g. Associated Costs
i. Capital
ii. Operations & Maintenance
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Typically, biogas plants have a 50day capacity. To reduce space, some have begun to use a 10day capacity tank. The smaller tank requires a more delicate mix of materials and requires a basic knowledge of biochemistry.

For the 10day tank, for 50 cows' waste, the plant was about 100 m^3 and circular. Fewer cows, smaller tank.

The tank would be "fed" waste daily. This requires keeping animals in barns in order to collect waste.

Digester would be built roughly the same way a farmer builds a silo. Half the circle is fed manure every day and mixed with water and heated to about body temperature. This mix seeps through the barrier to the other half where it is stored. At the end of the process (10 days or 50) this mix can be used to fertilize fields. The methane produced would be run through a heat exchanger to produce electricity.

About 25% of the energy that the digester produces would be used to power the digestor. The rest can make heat or electricity.

Grad student from Kenya: OLUSEGUN OLUJIMI OGUNKUA environmental pollution control

USDA cost estimates,
US Fed gov't, UN, UK, "factsheets" anaerobic digesters

Tom- do you have drawings of the digesters in Jamaica? Ray said you do...

PSU dept of Ag/Bio engineering- extension programs, factsheets/programs, biogas

industrial waste treatment

food waste/ composting

"pollution prevention pays"