Dear list members, in the context of hygienic requirements in biogas plants the issue of actual solids retention time and short-circuits seems to play an important role. The German Organic Waste Ordinance ("Bioabfall-Verordnung") requires certain temperature/retention-time combinations to ensure hygienization. One should therefore be able to tell how long pathogens entering a digester are actually subjected to a certain temperature before exiting the reactor. For a batch-fed system this is of course straightforward, but how about quasi-continuously fed digesters? Is anybody aware of publications or ongoing research regarding this topic? Mathias Effenberger Bayerische Landesanstalt fuer Landtechnik Am Staudengarten 3 85350 Freising GERMANY phone: +49 8161 71-5157 fax: +49 8161 71-4363 email: effenberger@tec.agrar.tu-muenchen.de Digestion List Archives: http://www.crest.org/discussion/digestion/current/ 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://solstice.crest.org/renewables/biomass-info/ Beginners Tour of Biogas http://WWW.roseworthy.adelaide.edu.au/~pharris/biogas/beginners
