<div><div>Hi Mohamed,<br><br>The general (though I am sure there will be other interpretations) mechanism of biogas formation is 4-step and involves:<br>1. Hydrolysis (degradation of polymers)<br>2. Acidogenesis (the formation of volatile fatty acids - low molecular carboxylic acids)<br>
3. Acetogenesis (the formation of acetate, CO2 and H2)<br>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) <br>
<br>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.<br><br>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><br>BR from Slovenia, Gasan<br><br></div>
<div> </div>
<div><b><span style="font-size: 10pt; font-family: Arial; color: rgb(153, 0, 51);">Ilja Gasan OSOJNIK ČRNIVEC, </span></b><span style="font-size: 10pt; font-family: Arial;">L05 - Laboratory for Environmental Sciences and Engineering</span>
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<br><br><br><br><div class="gmail_quote">On 21 March 2011 20:00, <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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Today's Topics:<br>
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1. introduction (elamin afilal)<br>
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----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Mon, 21 Mar 2011 16:45:22 +0000 (GMT)<br>
From: elamin afilal <<a href="mailto:afilalamin@yahoo.fr">afilalamin@yahoo.fr</a>><br>
To: <a href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</a><br>
Subject: [Digestion] introduction<br>
Message-ID: <<a href="mailto:38511.70590.qm@web26307.mail.ukl.yahoo.com">38511.70590.qm@web26307.mail.ukl.yahoo.com</a>><br>
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<br>
?Hi<br>
I am interested by the anaerobic digestion, I hope?producing sufisament of<br>
biogas from the organic wast in Morocco<br>
But I would previously like to be able to answer many questions as: what<br>
chemical constituent(component) bacteria attack in the first ? The biogas<br>
results initially from carbohydrates in the first?or all the constituents are<br>
attacked at the same?time??<br>
<br>
Thanks<br>
Sory for this bad englich<br>
<br>
?---------------------------------------------------<br>
AFILAL Mohamed Elamin<br>
<br>
<br>
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End of Digestion Digest, Vol 7, Issue 10<br>
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