Yes, I agree with the statement that with time everything turns to biogas, as time is of course the main engineering variable. With lignin, anaerobic digestion is possible in two ways.<br>Firstly, very low concentration of lignin can be degraded in such a way, that the decomposition intermediates of lignin are do not exceed the concentrations, when they become toxic to the microbiota. Such a sistem is hard to manage, as the kinetics of the decomoposition cascade has to be very closelly monitored.<br>
The second obvious option is pretreatment of lignin (mechanical, chemical, ...) that degrade the lignin beyond the toxic intermediates. The latter is more likely to be involved in the procedure you have mentioned. <br><br>
BR, Gasan<br><br><br>Dear Gasan,<br>
thanks for the information. Back in 1983, I spent about 6 months<br>
in Freiburg, Germany, conducting my own research in plant physiology, At<br>
that time I was not particularly interested in biogas technology, but I used<br>
to attend a number of the guest lectures which the university offered.<br>
I remember hearing a lecture in which the lecturer said that a biogas plant<br>
was capable of digesting any organic substance, even petroleum. All one had<br>
to do was to give it enough time. He then told us how the system developed<br>
by him was being used by a paper factory in Germany to obtain biogas<br>
from lignin, which remained behind after the cellulose in the wood was<br>
extracted for making paper. I do not remember the name of the lecturer. .<br>
Yours<br>
A.D.Karve<br><br><div class="gmail_quote">On 27 October 2010 21:00, <span dir="ltr"><<a href="mailto:digestion-request@lists.bioenergylists.org">digestion-request@lists.bioenergylists.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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1. Re: gasyield indigenious cowdung (Anand Karve)<br>
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Message: 1<br>
Date: Wed, 27 Oct 2010 12:52:23 +0800<br>
From: Anand Karve <<a href="mailto:adkarve@gmail.com">adkarve@gmail.com</a>><br>
To: For Discussion of Anaerobic Digestion<br>
<<a href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</a>><br>
Subject: Re: [Digestion] gasyield indigenious cowdung<br>
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Dear Gasan,<br>
thanks for the information. Back in 1983, I spent about 6 months<br>
in Freiburg, Germany, conducting my own research in plant physiology, At<br>
that time I was not particularly interested in biogas technology, but I used<br>
to attend a number of the guest lectures which the university offered.<br>
I remember hearing a lecture in which the lecturer said that a biogas plant<br>
was capable of digesting any organic substance, even petroleum. All one had<br>
to do was to give it enough time. He then told us how the system developed<br>
by him was being used by a paper factory in Germany to obtain biogas<br>
from lignin, which remained behind after the cellulose in the wood was<br>
extracted for making paper. I do not remember the name of the lecturer. .<br>
Yours<br>
A.D.Karve<br>
<br>
On Tue, Oct 26, 2010 at 1:56 PM, Gasan Osojnik <<a href="mailto:gasan.osojnik@gmail.com">gasan.osojnik@gmail.com</a>>wrote:<br>
<br>
> The biological degradation of lignin in anaerobic environments occures<br>
> rarely, and when it occurs it produces substances toxic to methanogenic<br>
> microbiota, such as phenols and para-cresol. In our experience, the lignin<br>
> decomposition intermediates inhibit the biogas production even in reactors<br>
> operating in continious regimes.<br>
><br>
> BR, Gasan<br>
><br>
><br>
><br>
> On 26 October 2010 05:25, <<a href="mailto:digestion-request@lists.bioenergylists.org">digestion-request@lists.bioenergylists.org</a>>wrote:<br>
><br>
>> gasyield indigenious cowdung<br>
><br>
><br>
><br>
> _______________________________________________<br>
> Digestion mailing list<br>
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> for more information about digestion, see<br>
> Beginner's Guide to Biogas<br>
> <a href="http://www.adelaide.edu.au/biogas/" target="_blank">http://www.adelaide.edu.au/biogas/</a><br>
> and the Biogas Wiki <a href="http://biogas.wikispaces.com/" target="_blank">http://biogas.wikispaces.com/</a><br>
><br>
><br>
><br>
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--<br>
***<br>
Dr. A.D. Karve<br>
President, Appropriate Rural Technology Institute (ARTI)<br>
<br>
*Please change my email address in your records to: <a href="mailto:adkarve@gmail.com">adkarve@gmail.com</a> *<br>
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for more information about digestion, see<br>
Beginner's Guide to Biogas<br>
<a href="http://www.adelaide.edu.au/biogas/" target="_blank">http://www.adelaide.edu.au/biogas/</a><br>
and the Biogas Wiki <a href="http://biogas.wikispaces.com/" target="_blank">http://biogas.wikispaces.com/</a><br>
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End of Digestion Digest, Vol 2, Issue 51<br>
****************************************<br>
</blockquote></div><br>