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HI David,<br>
<br>
<blockquote cite="mid:4CC9A353.4000307@h4c.org" type="cite"> I would
venture a guess that where the inlet air is being forced in by
bubbling through water, and the outlet air likewise is allowed to
escape by bubbling through water, then the only place in the
system where there would be both a potentially explosive gas
mixture and the potential of a spark would be at the evacuation
point of the exiting gas mixture. Where sufficient air is blown
over the water through which the evacuating air is exiting, then
the risk of any explosion would, I would think, be very close to
zero.<br>
<br>
</blockquote>
Just for some additional explaintation: Those garage systems have
just one door whichs seperates the digesting room from the
atmosphere. So you need to open the door to get the old material out
of the system and put in the new material. Existing methane from the
last digestion process may get in mixture of air oxygen during this
process. I think this is the problem Yvonne is wondering about.<br>
<br>
For getting a better idea of such garage systems you may look at
this report (2003, an independent, scientific report about one of
the first BioFerm systems, german language, but there are also a lot
of pictures to look at).<br>
See page 24, upper image:<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.lfl.bayern.de/ilt/umwelttechnik/13390/linkurl_0_3.pdf">http://www.lfl.bayern.de/ilt/umwelttechnik/13390/linkurl_0_3.pdf</a><br>
<br>
Best regards<br>
Markus Schlattmann<br>
<br>
<br>
<br>
<blockquote cite="mid:4CC9A353.4000307@h4c.org" type="cite"> <br>
d.<br>
<div>-- <br>
<div><span>David William House<br>
</span>
<div>"The Complete Biogas Handbook" <code><a
moz-do-not-send="true" href="www.completebiogas.com">www.completebiogas.com</a></code><br>
<em>Vahid Biogas</em>, an alternative energy consultancy <code><a
moz-do-not-send="true" href="www.vahidbiogas.com">www.vahidbiogas.com</a><br>
<br>
</code></div>
<div>"Make no search for water. But find thirst,<br>
And water from the very ground will burst."
<div>(Rumi, a Persian mystic poet, quoted in <em>Delight of
Hearts</em>, p. 77) <br>
<br>
<a moz-do-not-send="true" href="http://bahai.us/">http://bahai.us/</a></div>
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<pre wrap="">
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for more information about digestion, see
Beginner's Guide to Biogas
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and the Biogas Wiki <a class="moz-txt-link-freetext" href="http://biogas.wikispaces.com/">http://biogas.wikispaces.com/</a>
</pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Mit freundlichen Grüßen,
Markus Schlattmann
--------------------------------------
schlattmann sustainables
schlattmann.de
Dipl.-Ing. agr. Markus Schlattmann
Grünseiboldsdorfer Weg 5
85416 Langenbach
Tel.: +49 (0)8761 72162-60
Fax.: +49 (0)8761 72162-61
E-Mail: firmen@schlattmann de
Web:www.schlattmann.de
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