[Digestion] The biology of biogas production

Anand Karve adkarve at gmail.com
Tue Mar 22 11:18:39 CDT 2011


Dear Mr. Afilal,
if you used any substance that is digested by humans,(sugar, starch,
digestible protein or fat), it gets completely converted into biogas by
the methanogens. 1 kg of any of these substances would yield about 1 kg
biogas, containing the theoretically calculated proportion of roughly 25 to
30% methane and 70 to 75% carbon dioxide. The presence of a chain of
micro-organisms, with each one producing a product that serves as food for
the next one in the chain is not believable. If it were really so, one would
get a much higher concentration of carbon dioxide in the resultant biogas,
because the intermediate organisms produce only carbon dioxide and not
methane.
Yours
A.D.Karve

2011/3/22 Randy Mott <randymott at ceeres.eu>

>  Gasan,
>
>
>
> You interested in teaming on some projects there? I have to check the
> support system, but we will be expanding in 2012. We do investment, design,
> build and operate. Danish technology....
>
>
>
> Randy Mott
>
> CEERES
>
> Warsaw
>
>
>
> *From:* digestion-bounces at lists.bioenergylists.org [mailto:
> digestion-bounces at lists.bioenergylists.org] *On Behalf Of *Gasan Osojnik
> *Sent:* Tuesday, March 22, 2011 7:24 AM
> *To:* digestion at lists.bioenergylists.org
> *Cc:* digestion-request at lists.bioenergylists.org
> *Subject:* [Digestion] The biology of biogas production
>
>
>
> 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
>
>
>
> www.ki.si/en
>
>
>
> The National Institute of Chemistry is a public research institution
> engaged in public service, science, research and development activities. The
> Public Information Catalog is available online at
> http://www.ki.si/en/about-the-institute/katalog-ijz/.
>
>
>
> This message and any attached documents are confidential and intended
> solely for the addressee. If this message was not intended for you, no
> disclosure, further transmission or other use of the recieved information is
> allowed. In this case, please notify the sender and delete the message.
> National Institute of Chemistry assumes no responsibility for errors in
> transmission.
>
> iku. Če vam sporočilo ni bilo namenjeno, ni dovoljeno razkrivanje,
> nadaljnje pošiljanje ali drugačna uporaba oziroma predelava posredovanih
> informacij. V tem primeru vas prosimo, da obvestite pošiljatelja in
> sporočilo izbrišete. Kemijski inštitut ne prevzema odgovornosti za napake v
> prenosu.
>
>
>
> P Think before you print.
>
>
>
>
>  On 21 March 2011 20:00, <digestion-request at lists.bioenergylists.org>
> wrote:
>
> Send Digestion mailing list submissions to
>        digestion at lists.bioenergylists.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
>
> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
>
> or, via email, send a message with subject or body 'help' to
>        digestion-request at lists.bioenergylists.org
>
> You can reach the person managing the list at
>        digestion-owner at lists.bioenergylists.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Digestion digest..."
>
>
> Today's Topics:
>
>   1. introduction (elamin afilal)
>
>
> ----------------------------------------------------------------------
>
> 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
>
>
>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> http://lists.bioenergylists.org/pipermail/digestion_lists.bioenergylists.org/attachments/20110321/7a7aac1c/attachment-0001.html
> >
>
> ------------------------------
>
> _______________________________________________
> Digestion mailing list
>
> to Send a Message to the list, use the email address
> Digestion at bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
>
> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
>
> for more information about digestion, see
> Beginner's Guide to Biogas
> http://www.adelaide.edu.au/biogas/
> and the Biogas Wiki http://biogas.wikispaces.com/
>
>
>
> End of Digestion Digest, Vol 7, Issue 10
> ****************************************
>
>
>
> _______________________________________________
> Digestion mailing list
>
> to Send a Message to the list, use the email address
> Digestion at bioenergylists.org
>
> to UNSUBSCRIBE or Change your List Settings use the web page
>
> http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org
>
> for more information about digestion, see
> Beginner's Guide to Biogas
> http://www.adelaide.edu.au/biogas/
> 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 *
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/digestion_lists.bioenergylists.org/attachments/20110323/21f09301/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 5295 bytes
Desc: not available
URL: <http://lists.bioenergylists.org/pipermail/digestion_lists.bioenergylists.org/attachments/20110323/21f09301/attachment.jpg>


More information about the Digestion mailing list