[Digestion] camel dung

Jaime Marti Herrero tallerbiogas at hotmail.com
Thu Oct 28 03:19:08 PDT 2010

in bolivia we have some kind of camels.... the 'llama' http://en.wikipedia.org/wiki/Llama
Rene Alvarez from Public University of La Paz  (UMSA) has publish some paper about the ultimate production of biogas from llama dung on laboratory conditions:

it is a good substrate to obtain biogas. the problem is that have about 75-85% TS, so need to mixed with more water tham use to be with cow or pig manure. and in the places where one can get llama or camel dung use to be places with out much water.

We are doing now an experiment in real altiplano conditions (Cold Climate, 4000 meter over the sea level) to see the ultimate production of biogas from llama dung ... but not numbers yet, sorry.

keep in touch

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

-Taller Biogas Bolivia
-Video: Biodigester installation in bolivian Altiplano
-Manual gratuito-Biodigestores familiares: Guía de diseño y manual de instalación

From: Yvonne.Voegeli at eawag.ch
To: digestion at lists.bioenergylists.org
Date: Thu, 28 Oct 2010 10:53:16 +0200
Subject: [Digestion] Dry fermentation in developing countries

Dear all,


I like to start a new discussion on a different topic,
namely the dry-fermentation process (discontinuous) similar to the digesters
developed by the companies Bekon or Bioferm in Germany. The organic waste is filled
batch-wise into simple garage-like digesters for about 30-40 days.


Experts report that this process has a high potential for
application in developing countries as it has the simplest design and the solid
waste digesters are the least expensive ones. Also, substrates that lead to
operating problems during wet fermentation due to their structure or the
proportion of impurities they contain can still be processed using dry
fermentation methods. However, up to date, there is no experience with this
technology in developing countries. Therefore, our idea is to develop a
dry-fermentation biogas plant adapted to the situation in developing countries
using locally available material.  


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 anybody of you familiar with discontinuous dry-fermentation
systems and has an idea how the security can be assured in a developing country
context? Is it possible to install a simpler venting system?

- Likewise, when removing the drum from a floating-drum
digester for emptying, how is ensured that at no time an explosive
gas-air-mixture occurs?


Thanks for your ideas,



Yvonne Vögeli

Eawag / Sandec

Überlandstrasse 133

P.O. Box 611

8600 Dübendorf


Phone: +41 (0)44 823 54 20

Fax: +41 (0)44 823 53 99

yvonne.voegeli at eawag.ch



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