Dear Mr Wayne, We did get small quantities of gas from coffee grounds. However, the fact that you are collecting coffee grounds on a weekly basis, excludes a large fraction that would go into making biogas - namely the simpler components.
Subsequently, removal of the simpler components from the material especially by digesting it first in a biogas plant provides a great deal of protection against infection /contamination by a variety of common fungi. They do not attack the feedstock as easily as they would have done if the simple to break down components were not first removed from the material used for mushroom cultivation. Besides, coffee grounds singly would not allow adequate aeration for growing mushrooms and would require an inert or a material like rice straw that could provide sufficient voids for air to pass. If you have only coffee grounds as a coarse powder, you will need a different technique (other than the hanging bag method) to raise oyster mushrooms. After mushroom cultivation, there would be very little left for conversion by anaerobic digestion. I would not have much hopes for this last option. best wishes Chanakya -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Digestion mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org for more information about digestion, see Beginner's Guide to Biogas http://www.adelaide.edu.au/biogas/ and the Biogas Wiki http://biogas.wikispaces.com/
