Once again, we turn to a chart from David House's Biogas Handbook:
"The chart asumes two critical things: first, that you are digesting food waste, and second, that the digester is at body temp. Given just those two assumptions, it shows you how many 1-gallon buckets of food waste you need to be able to get the outcome you want— and what size of digester you’ll need too. Simple. Clear. Ready? Here it is:
Food waste power!
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Read more: http://www.motherearthnews.com/editorial/blogs/renewable%20energy/food%…
We also make use of the advice found in the Chinese Biogas Manual (I purchased it from Knowledge Publications)
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How much biogas do I need to make my life better?