Smertrios;
I found this while Googling. It gives the energy equivalency for a variety of stuff that can go into a methane digester.
http://www.mwk-biogas.com/DOCS/Sampl...Substrates.pdf
mactec54;
If you have some links I would like to see them. My understanding is that 'mash', which is obtained by partial digestion of corn starch and other starch containing grains to produce glucose, goes into ethanol fermentation. After the glucose has been used by the yeast to make ethanol a 'high protein mash' is obtained as a by-product and this can be fed to cattle or digested in a methane digester. What comes out of a methane digester has plenty of minerals and forms a good fertilizer for crops, but it has virtually no organic carbon in the form of cellulose or starches.