[Digestion] Solar assisted biogas plant

Mon Dec 6 12:21:00 CST 2010

let me told you that the High Camp of the Huayna Potosi (6088 masl) is situated at 5200masl, and they have ask me for a digester to treat the black waters generated by the mountainers whom sleep there to climb on the morning....We are considering the design of this special digester.more news in few months... :-)
keep in touchjaime

-----
Jaime Martí Herrero

Technical advisor of biogas for the GTZ-Bolivia
CIMNE (www.cimne.com)
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 10:08:11 -0700
From: alex at sistemabiobolsa.com
To: digestion at lists.bioenergylists.org
Subject: Re: [Digestion] Solar assisted biogas plant

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 helpsKeep in touchJaime
-----
Jaime Martí Herrero

Technical advisor of biogas for the GTZ-Bolivia
CIMNE (www.cimne.com)

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

--

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for more information about digestion, see

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-- 
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

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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/ 		 	   		  

_______________________________________________

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.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/ 		 	   		  
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