[Stoves] Biodigester construction in Bolivia (Video)

[Jaime Marti Herrero]

Hi. i will try to explain some things about these biodigesters (i am from
Spain and my English is not as good as i would like, sorry)

the raw material is fresh cow manure. some times the family mix it with
sheep manure or pig.But The principal material is cow manure.
This biodigesters are design for to be load with 20kg of fresh cow manure
and 60 liters of water. The retention time is about 75 days. And the biogas
production is estimated on 700-750 liters of biogas. this amount of biogas
is enough for 4-5 hour of cooking. Also they can use a gas for light with a
gas lamp.

The biodigesters deley producing goob biogas  about two months since its
installation and first load. 

in some regions, there are two moths with no water. In this case they can
use the liquid fertilizer to mix with new fresh cow manure anda load the
biodigester. so in these months the liquid fertilizer replaced the water.
The biodigester must be inside a greenhouse. the walls of the green house
must be made with pressed sand ('adobe' or 'tapial' in spanish) and this
wall have to be 40cm width. this is to take adventage os the thermal mass of
the walls for the colds nights.

the plastic is black color, but not to gain solar radiation, if not because
we have seen that with black color the durability of the plastic is longer.

I have write design Guide and manual installation about this technology. It
is in Spanish, and i hope some one could translate it to English. It is free
distribution document.

Please, any question about the technology or the experience we are having
for 7 year in Bolivia, don't doubt to ask. As well, in Peru is beginning to
installation this kind of biodigester.

We keep in contact
Jaime Marti Herrero
GTZ-Energía

> From: list at sylva.icuklive.co.uk
> To: digestion at listserv.repp.org
> Date: Wed, 16 Jan 2008 11:39:09 +0000
> Subject: Re: [Digestion] biodigester construction in Bolivia (Video)
> 
> On Mon, 14 Jan 2008 11:08:53 -0400, Jaime Marti Herrero wrote:
> 
> >I just have upload a video to youtube about the construction of a
biodigester for Altiplano region, Bolivia. This means 3500-4500 meter over
the sea level, and minimum temperatures of -15Cº.
> 
> It looks interesting, what is the raw material?
> 
> Also as the gas pipe leaves the digester there is what looks like a
> broken bottle Teed off the line, what is it?
> 
> AJH