[Digestion] Solar assisted biogas plant

Mon Dec 6 11:08:11 CST 2010

Ooops.  No digesters on top of Huayna Potosi yet!  Sorry!  Today 4000
meters, tomorrow 6000 meter systems for alpineers!

A

On Mon, Dec 6, 2010 at 9:49 AM, Jaime Marti Herrero <
tallerbiogas at hotmail.com> wrote:

>  Hi all!
> 6000 meter above sea level? no no... :-) we work about 4000 masl...
> temperature during a winter night can reach -13ºC, and frezzing temperatures
> are reached during almost three months per year.
> Our idea has been to use local material. As Alex said, we do a greenhouse
> with sand bricks walls. at the botton of the digester we use local isolating
> material (as straw)... Using the greenhouse with sand walls and straw as
> isolation we keep about 20-25ºC inside the digester. And thi is enough to
> run the anaerobic digestion.
> You can find in this video how we do this kind of digester for cold
> climates:
> http://es.youtube.com/watch?v=3Sl0XEN5Bgo
> In tropical digesters you will find temperatures of the mud about
> 23-28ºC... so, if in cold climates we get 20-25ºC is a good deal.
>
> About active heating systems... for us they are very expensive. To heat
> water and pump it throught pipes inside the digester as a heat exchange
> system means the cost of the pump, the cost to mantein the pump, the cost of
> the pipes.... for us, a simple solution has been the greenhouse with sand
> walls ans isolation.
>
> For bigger digesters one can use better isolation systems, as the comercial
> ones used in buildings.
>
> I hope this helps
> Keep in touch
> Jaime
> -----
> *Jaime Martí Herrero*
>
> *Technical advisor of biogas for the GTZ-Bolivia*
>
> *CIMNE (*www.cimne.com <http://www.cimne.com/beegroup>)
>
> *Building Energy and Environment Group*
>
> *International research cooperation area*
>
> La Paz · Bolivia
>
> Tel. (+591)-73 090 621
>
>
>
>
> *BIOGAS AND BOLIVIA*
> -Taller Biogas Bolivia
> http://tallerbiogas.blogspot.com
> -Video: Biodigester installation in bolivian Altiplano
> http://es.youtube.com/watch?v=3Sl0XEN5Bgo
> http://www.youtube.com/watch?v=Vs0JuV8WD_c
>
> -Manual gratuito-Biodigestores familiares: Guía de diseño y manual de
> instalación
> http://www.upc.edu/grecdh/pdf/2008_JMH_Guia_biodigestores.pdf
>
>
>
>
> ------------------------------
> Date: Mon, 6 Dec 2010 09:17:09 -0700
> From: alex at sistemabiobolsa.com
> To: digestion at lists.bioenergylists.org
> Subject: Re: [Digestion] Solar assisted biogas plant
>
>
> Chanakya,
>
> Jaime Marti has had success with digesters at 6000 meters in Bolivia with
> really cold temperatures.  He uses a very nice design of adobe walls,
> southern aspects, and plastic greenhouse panels to heat the digester.  Our
> temperatures are not as cold, but we often deal will near-freezing
> conditions, and we are using tunnel-type greenhouse structures that have
> been shown to maintain temperatures 15-20 degree above ambient temperature.
> We have considered thermal solar heating of water, with circulation mats
> installed under the digester.  And we have tried this with biogas heated
> water.  Our energy balance was not that great however...
>
> I have experimented with hay water running through pipes inside the
> digester, and I will warn you that the pipes quickly become covered in the
> material and begin to become "insulated" and loose their effectiveness at
> transferring heat (has anyone else dealt with this?).  On a larger scale, I
> have seen good option where sludge pumps pull materials from the bottom of a
> digester, run the material through an external heat exchanger, and then
> return it the system.  These use waste heat from a biogas generator.
>
> Best,
>
> A
>
> On Mon, Dec 6, 2010 at 6:56 AM, Hoysall Chanakya <
> chanakya at astra.iisc.ernet.in> wrote:
>
> I am trying to get a few people to dream of solar assisted biogas plants
> for regions that may have temperatures nearer zero but are not under
> permafrost.  Very long back I was involved with a prototype that used a
> solar water heated biogas plant roof (for Bangalore) and could raise the
> digester temperature from 16 to 28C.  I am requesting list users if there
> is any past experience, current hope or promise for this idea of solar
> heated /assisted biogas plant to work in northern Europe and UK?  or cite
> some examples that I could look up.
> Anaerobically!!  Chanakya
>
> chanakya[ at ]astra.iisc.ernet.in
> --
> 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
>
>
> --
> This message has been scanned for viruses and
> dangerous content by MailScanner, and is
> believed to be clean.
>
>
> _______________________________________________
> 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/
>
>
>
>
> --
> Alexander Eaton
> Sistema Biobolsa
> IRRI-Mexico
> RedBioLAC
>
> Mex cel: (55) 11522786
> US cel: 970 275 4505
>
> alex at irrimexico.org
> alex at sistemabiobolsa.com
>
> sistemabiobolsa.com
> www.irrimexico.org
> www.redbiolac.org
>
>
> _______________________________________________ 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.orgfor more information about digestion, see Beginner's Guide to Biogas
> http://www.adelaide.edu.au/biogas/ and the Biogas Wiki
> http://biogas.wikispaces.com/
>
> _______________________________________________
> 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/
>
>
>

-- 
Alexander Eaton
Sistema Biobolsa
IRRI-Mexico
RedBioLAC

Mex cel: (55) 11522786
US cel: 970 275 4505

alex at irrimexico.org
alex at sistemabiobolsa.com

sistemabiobolsa.com
www.irrimexico.org
www.redbiolac.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/digestion_lists.bioenergylists.org/attachments/20101206/1b54519c/attachment.html>