Hi Alll,
Thanks for the last post, but you left me with a question. Our data has shown pig manure is generally (roughly) between 20-25% TS, but the VS is often 70-80% of the TS, so between 10-20% of the total mass of the wet manure. This corresponds with other data I have seen (right in front of me House uses 20% TS and VS of 70% of TS for cow manure)
Comparing substrates defined with the term "manure" is not easy. It often depends on how the stables are managed. (e.g. more litter may lead to higher TS, if the manure is analysed including the litter).
Another point is: pigs are monogastrians (like humans are). Cows are not. So it's quite obvious that pigs (and humans) absorb lower parts of degradable VS. Or vice versa: the "food-utilisation-ratio" (sorry, I don't know the english language word) for monogastrians is lower than for ruminants. So the resulting pigs' manure VS content is higher than cows' manure VS content. This is also what your data show (70-80% vs 70%). This also leads to a higher gas yield of pigs manure in comparison to cow manure (L/kg VS).
Kind regards 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 ------------------------------------- _______________________________________________ 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/
