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| -Design Various designs exist, some more complicated than others. Essentially is comprised of a sealed digesting vessel in which compost, manure and/or vegetable scraps combined with water and a microbial innoculation produce methane as a by product of microbial metabolism. The gas is then drawn off and burned. Difference in designs mainly revolve around how to accomplish this second step. Some employ a separate gas storage vessel, more simple designs collect the gas above the digesting slurry. Youtube video of a design that I find is sofisticated enough without being difficult for a preliminary effort: http://www.youtube.com/watch?v=l5e_2W71jMM |
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| Other examples: http://www.youtube.com/watch?v=TTdreS_HN2Y -Materials Based on the above design and others two to three 50 gallon plastic tanks; PVC Tubing, connectors, etc.; manure/vegetable scraps and microbes; and the tools necessary to assemble the system seem like the basic requirements. Refinements to the basic system seem not to require too many extra materials. -Assembly Seems simple enough if done carefully, also potentially fun. -Testing Initial objective here to get combustible gas with a later focus on filtration and clean burning methane. |
__'''Design '''__ Various designs exist, some more complicated than others. Essentially is comprised of a sealed digesting vessel in which compost, manure and/or vegetable scraps combined with water and a microbial inoculation produce methane as a by product of microbial metabolism. The gas is then drawn off and burned. Difference in designs mainly revolve around how to accomplish this second step. Some employ a separate gas storage vessel, more simple designs collect the gas above the digesting slurry. Youtube video of a design that I think is sophisticated enough without being difficult for a preliminary effort: http://www.youtube.com/watch?v=l5e_2W71jMM Commercial example: http://www.youtube.com/watch?v=TTdreS_HN2Y __'''Materials'''__ Based on the above design and others - two to three 50 gallon plastic tanks; PVC Tubing, connectors, etc.; manure/vegetable scraps and microbes; and the tools necessary to assemble the system seem like the basic requirements. Refinements to the basic system seem not to require too many extra materials. __'''Assembly'''__ Seems simple enough if done carefully, also potentially fun. The time frame to get usable gas from what I understand is about two weeks after set up. __'''Testing'''__ Initial objective here to get combustible gas with a later focus on filtration and clean burning methane. Safety important here. |
Methane Digester
Construction and testing of small-scale microbial digester that produces usable methane gas.
Design
Various designs exist, some more complicated than others. Essentially is comprised of a sealed digesting vessel in which compost, manure and/or vegetable scraps combined with water and a microbial inoculation produce methane as a by product of microbial metabolism. The gas is then drawn off and burned. Difference in designs mainly revolve around how to accomplish this second step. Some employ a separate gas storage vessel, more simple designs collect the gas above the digesting slurry. Youtube video of a design that I think is sophisticated enough without being difficult for a preliminary effort: http://www.youtube.com/watch?v=l5e_2W71jMM
Commercial example: http://www.youtube.com/watch?v=TTdreS_HN2Y
Materials
Based on the above design and others - two to three 50 gallon plastic tanks; PVC Tubing, connectors, etc.; manure/vegetable scraps and microbes; and the tools necessary to assemble the system seem like the basic requirements. Refinements to the basic system seem not to require too many extra materials.
Assembly
Seems simple enough if done carefully, also potentially fun. The time frame to get usable gas from what I understand is about two weeks after set up.
Testing
Initial objective here to get combustible gas with a later focus on filtration and clean burning methane. Safety important here.