Hi,
It is well known that batch digestion does not produce the same amount
of biogas every day. Obviously it takes some time for the ecology of
the digester to get established (during which time, of course, gas
production is low), and it is surely something approaching a law of
biology that the more digestible components of the substrate will be
used up first, and then some of the more recalcitrant materials will--
eventually-- be digested. The succession of these stages offers a
well-known curve, which is either bell-shaped, if it plots daily
production, or a long S (ogee) curve if we are plotting cumulative
production.
--
David William House
"The Complete Biogas Handbook" |www.completebiogas.com|
/Vahid Biogas/, an alternative energy consultancy |www.vahidbiogas.com
|
Yes, this is also my experience. And if you have already an active
microbial population in the beginning (e.g. taking digestate of an
active digester as an inoculum), the gas production starts quickly.
For having a look at some data, I just added 2 old plots to my webpage,
one showing the "bell shape" (upper image), the other the "S curve"
(lower image).:
http://www.schlattmann.de/biogas/3-substrate/biogas3-batch-test.php
Most of the gas in batch operation is produced in the first 2 weeks,
after that it keeps long at a low level.
--
Mit freundlichen Grüßen
Markus Schlattmann
--------------------------------------
schlattmann sustainables
schlattmann.de
Dipl.-Ing. agr. Markus Schlattmann
Grünseiboldsdorfer Weg 5
85416 Langenbach
Tel.: +49 (0)8761 72162-60
Fax.: +49 (0)8761 72162-61
E-Mail: fir...@schlattmann de
Web: www.schlattmann.de
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