Dear Yvonne,
For Dry Fermentation for developing country, I suppose the substrates needs
to be treated with composting process before disposing or use it as soil
conditioner( to get rid of the smell and to dry it further to reduce the
weight and save transportation cost ).
One can actually install an air blower and install some pipes under the
floor to carry out aeration process after completion of the anaerobic
process, that will also solve the problem about when you open the door of
the digester.
Hopes it will answer your question.
William Tan
SP MULTITECH
Malaysia
[email protected]
Today's Topics:
1. Dry fermentation in developing countries (Voegeli, Yvonne)
2. camel dung (Jaime Marti Herrero)
3. Re: Dry fermentation in developing countries (David)
4. Re: Dry fermentation in developing countries (Alexander Eaton)
5. Re: Dry fermentation in developing countries (Joshua Bogart)
6. Re: Dry fermentation in developing countries (Hoysall Chanakya)
7. Re: Digestion Digest, Vol 2, Issue 46 (Bj?rn Dahlroth)
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Message: 1
Date: Thu, 28 Oct 2010 10:53:16 +0200
From: "Voegeli, Yvonne" <[email protected]>
To: "[email protected]"
<[email protected]>
Subject: [Digestion] Dry fermentation in developing countries
Message-ID:
<1aa2b5df4e6b214a875a9d353997adea022047d6f...@eaw-exc-mail.eawag.wroot.emp-eaw.ch>
Content-Type: text/plain; charset="iso-8859-1"
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
???
Yvonne V?geli
Eawag / Sandec
?berlandstrasse 133
P.O. Box 611
8600 D?bendorf
Switzerland
Phone: +41 (0)44 823 54 20
Fax: +41 (0)44 823 53 99
[email protected]
http://www.sandec.ch
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