[Digestion] The biology of biogas production

Tue Mar 22 01:23:54 CDT 2011

 Hi Mohamed,

The general (though I am sure there will be other interpretations) mechanism
of biogas formation is 4-step and involves:
1. Hydrolysis (degradation of polymers)
2. Acidogenesis (the formation of volatile fatty acids - low molecular
carboxylic acids)
3. Acetogenesis (the formation of acetate, CO2 and H2)
4. Methanogenesis (from acetete -> CO2 and CH4 is formed, from CO2 and H2 ->
CH4 is formed, methanogenesis from acetate and CO2+H2 has to run
simultaneously for the proces to be stable)

The last step is the reason why there will be always some CO2 in biogas.
Each of this steps is carried out by different groups of microorganisms.

So the initial biochemical sources of biogas are carbohydrates, proteins,
fats etc. In the long run, any substance that can be converted
intermediately either to dissolved CO2 and H2 or to acetate is appropriate
for biogas production.

BR from Slovenia, Gasan

*Ilja Gasan OSOJNIK ČRNIVEC, *L05 - Laboratory for Environmental Sciences
and Engineering

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P Think before you print.

On 21 March 2011 20:00, <digestion-request at lists.bioenergylists.org> wrote:

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>   1. introduction (elamin afilal)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Mon, 21 Mar 2011 16:45:22 +0000 (GMT)
> From: elamin afilal <afilalamin at yahoo.fr>
> To: digestion at lists.bioenergylists.org
> Subject: [Digestion] introduction
> Message-ID: <38511.70590.qm at web26307.mail.ukl.yahoo.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> ?Hi
> I am interested by the anaerobic digestion, I hope?producing sufisament of
> biogas from the organic wast in Morocco
> But I would previously like to be able to answer many questions as: what
> chemical constituent(component) bacteria attack in the first ? The biogas
> results initially from carbohydrates in the first?or all the constituents
> are
> attacked at the same?time??
>
> Thanks
> Sory for this bad englich
>
> ?---------------------------------------------------
> AFILAL Mohamed Elamin
>
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> for more information about digestion, see
> Beginner's Guide to Biogas
> http://www.adelaide.edu.au/biogas/
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