[Digestion] Fwd: The biology of biogas production

[Anand Karve]

---------- Forwarded message ----------
From: Anand Karve <adkarve at gmail.com>
Date: 2011/6/2
Subject: Re: [Digestion] The biology of biogas production
To: Gasan Osojnik <gasan.osojnik at gmail.com>


Dear List,
 Irrespective of the substrate, design of the system or the temperature of
the reaction, the proportion of methane to carbon dioxide in the
biogas seems to be constant all over the world. Is there an
equilibrium between these two gases that keeps this proportion constant?
Because in that case, one might introduce carbon dioxide from outside into
the biogas plant and see if the organisms in the digester produce more
methane to reach the euilibrium constant. I shall be grateful to get your
reaction on this.
Yours
A.D.Karve

2011/3/22 Gasan Osojnik <gasan.osojnik at gmail.com>

>  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
>
>
>
> [image: KI+letokemije.jpg]
>
>
>
> National Institute of Chemistry
>
> Hajdrihova 19
>
> SI-1001 Ljubljana
>
>
>
> Tel.: (01) 47 60 239
>
>        (01) 47 60 200
>
> Fax: (01) 47 60 300
>
>
>
>
>
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