To: digestion@crest.org We have run anaerobic digesters and naturally the sludge goes to the bottom and slows down the reaction. A simple solution is to lay a network of ½" plastic pipe on the bottom of the tank, pick up the gas or liquid at the top and pump it back through the sludge. This will keep the sludge stirred up so digestion is fast. If you want to hold 90-95F just pump the gas-liquid through an above ground network of plastic pipe. In cool weather the sun will warm it, in warm weather you do the same thing at night and the gas-liquid will cool off. It is easy and a low cost way of holding the proper temperature as well as keeping the sludge stirred up. I can provide more details, feel free to spread the idea around. Stuart A. Hoenig hoenig@ece.arizona.edu Digestion List Archives: http://www.crest.org/discussion/digestion/200202/ Digestion List Moderator: Paul Harris, paul.harris@adelaide.edu.au http://www.roseworthy.adelaide.edu.au/~pharris List-Post: <mailto:digestion@crest.org> List-Help: <mailto:digestion-help@crest.org> List-Unsubscribe: <mailto:digestion-unsubscribe@crest.org> List-Subscribe: <mailto:digestion-subscribe@crest.org> Other Digestion Events and Information: http://www.bioenergy2002.org http://crest.org/discussiongroups/resources/biomass/biogas/BIOGASMK.pdf http://www.crest.org/articles/static/1/1010424940_7.html Beginners Tour of Biogas http://WWW.roseworthy.adelaide.edu.au/~pharris/biogas/beginners
