[Digestion] Dry fermentation in developing countries

Michael Köttner m.koettner at biogas-zentrum.de
Thu Oct 28 12:43:59 PDT 2010


Dear Chanakya,

could you send me the article or the link where I could download the research 
papers.

Thank you very much.

Michael Köttner IBBK

Am Donnerstag 28 Oktober 2010 18:28:35 schrieb Hoysall Chanakya:
> Dear All,
> At IISc Bangalore there has been sustained work on small scale dry
> digestion carried out over the last 20 years (termed as solid state
> stratified bed reactor) in principle very similar to Bekon.  There is
> quite some data on how the process works and how much gas can be obtained
> from various feedstocks.
>
> I could send 4 research papers bearing this information to whoever is
> interested.  Please send me a mail directly.  Tommorrow I will make a
> small gist of this work and post it to the server.
> with best wishes
> chanakya
>
> > In a developing world context, it would also make sense to utilize the as
> > much of the gas production as possible, meaning that maybe a two-chamber
> > system would make the most sense so that you could allow the HRT to be
> > 100+
> > days in each chamber.  Then, if there was a flexible portion of each
> > chamber
> > that could be compressed while venting you would be able to essentially
> > eliminate any risk of an explosive mixture inside the system.  My point
> > it that it would make sense to push the gas through to the end-use, then
> > open the chamber while it was empty.  Under that scenario I see very
> > little risk.  I may also be talking at a small scale, as I am imagining
> > chamber of
> > maybe 50 m3 and smaller.  Dry digestion for us would be a huge step, as
> > we have a water limitation that keeps us from installing digesters in
> > many areas of Mexico and Latin America.
> >
> > I am returning from the UN Genus waste to energy meeting in Costa Rica,
> > where I did have a really interesting discussion about a multi-chambered
> > dry
> > digester system for food waste and solid waste collected at a larger
> > level and installed at landfills.  In that scenario, I also envision some
> > sort of
> > flexible cover that could be vacuum pumped empty before the cover was
> > opened.  We were also talking about cells with 2+ year HRTs.
> >
> > Does anyone have some good info on dry digestion, appropriate substrates,
> > HRTs and gas production rates?
> >
> > A
> >
> > On Thu, Oct 28, 2010 at 10:22 AM, David <david at h4c.org> wrote:
> >> Yvonne,
> >>
> >> On 10/28/2010 1:53 AM, Voegeli, Yvonne wrote:
> >>
> >> After visiting a Bekon biogas plant in Switzerland, I’m especially
> >> concerned regarding the opening of the digester for emptying and
> >> refilling.
> >> Before opening the door, the digester has to be vented in order to avoid
> >> a
> >> gas-air-mixture which is explosive. This installation seems to me rather
> >> complicated....
> >>
> >>  ...Is it possible to install a simpler venting system?
> >>
> >>
> >> I would venture a guess that where the inlet air is being forced in by
> >> bubbling through water, and the outlet air likewise is allowed to escape
> >> by
> >> bubbling through water, then the only place in the system where there
> >> would
> >> be both a potentially explosive gas mixture and the potential of a spark
> >> would be at the evacuation point of the exiting gas mixture. Where
> >> sufficient air is blown over the water through which the evacuating air
> >> is
> >> exiting, then the risk of any explosion would, I would think, be very
> >> close
> >> to zero.
> >>
> >>
> >>
> >> d.
> >> --
> >> David William House
> >>  "The Complete Biogas Handbook" www.completebiogas.com
> >> *Vahid Biogas*, an alternative energy consultancy www.vahidbiogas.com
> >>
> >>  "Make no search for water.       But find thirst,
> >> And water from the very ground will burst."
> >> (Rumi, a Persian mystic poet, quoted in *Delight of Hearts*, p. 77)
> >>
> >> http://bahai.us/
> >>
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> >> http://www.adelaide.edu.au/biogas/
> >> and the Biogas Wiki http://biogas.wikispaces.com/
> >
> > --
> > Alexander Eaton
> > Sistema Biobolsa
> > IRRI-Mexico
> >
> > Mex cel: (55) 11522786
> > US cel: 970 275 4505
> >
> > alex at sistemabiobolsa.com
> > alexanderb.eaton at gmail.com
> > sistemabiobolsa.com
> > www.irrimexico.org
> >
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> > http://www.adelaide.edu.au/biogas/
> > and the Biogas Wiki http://biogas.wikispaces.com/
>
> --
> Dr. Hoysall Chanakya
> Centre for Sustainable Technologies
> (Assoc. Faculty at Centre for Infrastructure, Sustainable Transport and
> Urban Planning (CiSTUP) and Centre for Contemporary Studies)
> Indian Institute of Science, Bangalore 560 012
> ph 91-80-2293 3046; fax-91 80 2360 0683

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