RE: DIG-L: community biogas in North America/Europe

[Marty Climenhaga <mclimenhaga@macviro.com>]

Thanks very much for your replies Stuart and Paul. The question of dry 
digestion reminds me of something I heard about a farm practice of sealing 
up hay in plastic, where it digests over the winter, and then the bag is 
cut open and the contents used for sileage (methane released to 
atmosphere). Does anyone know about that or have I got the facts wrong?


>G'day Marty,

>For solid waste I think you should look at dry digestion, which should
>raise a few comments from others in the list more knowlegable than I in
>that area. That avoids the chopping/slurry but you may need to develop
>an inocculum.

-----Original Message-----
From:	Marty Climenhaga [SMTP:mclimenhaga@macviro.com]
Sent:	Tuesday, March 19, 2002 8:47 AM
To:	digestion@crest.org
Subject:	DIG-L: community biogas in North America/Europe

Hello all
I'm working with a community group that has some funding to explore options 
for a very small-scale, low-tech biogas plant. They would like to see
whether it is possible and how expensive it is to digest about a tonne a
week of foodscraps and garden waste, with the biogas being used for
supplemental greenhouse heating.  I know there are lots of examples of this 
kind of scale digestion with manure in developing countries, I have helped
out with one in El Salvador, but I don't know whether it's possible to do
it here in Canada, especially with a feedstock that would have to be
chopped up and slurried. I'm wondering whether anyone knows of any examples 
in North America or Europe or has any ideas to help me (my first reaction
is that regulatory issues and economics would make it very expensive /
close to impossible here, but I can't necessarily prove that it wouldn't
work).
Thanks for any thoughts at all.
Marty

Marty Climenhaga, M.S. (Eng)
MacViro Consultants Inc.
600-90 Allstate Parkway
Markham ON L3R 6H3
tel: 905-475-7270 ext. 289
fax: 905-475-5994





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