> As a result some people see AD as "biogas", some as "Carbon", some as > "waste disposal", some as "pathogen reduction" and some as "fertiliser". > What we really need to do is see anaerobic digestion as all of the above > and as part of a larger system. This involves a move away from the typical > Western "linear" approach (of extract, use, discard) to a more cyclic > approach (we have a Reuse, Recycle, Reduce slogan going around, sometimes > with a 4th R that I can't remember). I know some areas have been doing > this for centuries, and even Westerners used to be better at it (before > coal and oil!). > Okay... since we're on a roll here, tell me if you think a scenario similar to the following sounds TOO FAR OUT:
animal manure goes into an in-ground plug/flow digester; spent digestate goes to both sediment pond and aerobic compost pile; sediment pond produces duckweed and nutrient for hydroponic grow beds; duckweed is harvested and dried for animal feed; methane produced runs an engine; engine coolant keeps digester warm (radiator coils wrap around digester); engine runs generator to produce electricity; electricity lights and runs pumps for hydro .... what have I forgotten? _______________________________________________ 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/
