[Digestion] gasyield indigenious cowdung1

[Gasan Osojnik]

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.
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.
 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, Gasan


Dear Gasan,
thanks for the information. Back in 1983, I spent about 6 months
in Freiburg, Germany, conducting my own research in plant physiology, At
that time I was not particularly interested in biogas technology, but I used
to attend a number of the guest lectures which the university offered.
I remember hearing a lecture in which the lecturer said that a biogas plant
was capable of digesting any organic substance, even petroleum. All one had
to do was to give it enough time. He then told us how the system developed
by him was being used by a paper factory in Germany to obtain biogas
from lignin, which remained behind after the cellulose in the wood was
extracted for making paper. I do not remember the name of the lecturer. .
Yours
A.D.Karve

On 27 October 2010 21:00, <digestion-request at lists.bioenergylists.org>wrote:

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>   1. Re: gasyield indigenious cowdung (Anand Karve)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Wed, 27 Oct 2010 12:52:23 +0800
> From: Anand Karve <adkarve at gmail.com>
> To: For Discussion of Anaerobic Digestion
>        <digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] gasyield indigenious cowdung
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>        <AANLkTimrDWUn++LfkZ19XJvxym_rDRT=DXrQxBP-EX9v at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear Gasan,
> thanks for the information. Back in 1983, I spent about 6 months
> in Freiburg, Germany, conducting my own research in plant physiology, At
> that time I was not particularly interested in biogas technology, but I
> used
> to attend a number of the guest lectures which the university offered.
> I remember hearing a lecture in which the lecturer said that a biogas plant
> was capable of digesting any organic substance, even petroleum. All one had
> to do was to give it enough time. He then told us how the system developed
> by him was being used by a paper factory in Germany to obtain biogas
> from lignin, which remained behind after the cellulose in the wood was
> extracted for making paper. I do not remember the name of the lecturer. .
> Yours
> A.D.Karve
>
> On Tue, Oct 26, 2010 at 1:56 PM, Gasan Osojnik <gasan.osojnik at gmail.com
> >wrote:
>
> > The biological degradation of lignin in anaerobic environments occures
> > rarely, and when it occurs it produces substances toxic to methanogenic
> > microbiota, such as phenols and para-cresol. In our experience, the
> lignin
> > decomposition intermediates inhibit the biogas production even in
> reactors
> > operating in continious regimes.
> >
> > BR, Gasan
> >
> >
> >
> > On 26 October 2010 05:25, <digestion-request at lists.bioenergylists.org
> >wrote:
> >
> >> gasyield indigenious cowdung
> >
> >
> >
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> > and the Biogas Wiki http://biogas.wikispaces.com/
> >
> >
> >
>
>
> --
> ***
> Dr. A.D. Karve
> President, Appropriate Rural Technology Institute (ARTI)
>
> *Please change my email address in your records to: adkarve at gmail.com *
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