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Hi all,<br>
<br>
yes, that's true.<br>
But it seems that Mel already is in knowledge of the
removed/degraded COD. <br>
So in this case the lignocellulosic material would stay as
undegraded COD is not relevant COD-input for this estimation.<br>
<br>
Markus<br>
<br>
Am 14.02.2011 01:29, schrieb Anand Karve:
<blockquote
cite="mid:AANLkTikWE5SEReMNdcLAyFCkduLiF3=+zKpQTMWTVvaY@mail.gmail.com"
type="cite">
<div>Dear All,</div>
<div> The amount of methane produced by a substrate would depend
upon the nature of the organic matter in it. The organic matter
in the dung of herbivores would consist to a large extent of
lignocellulosic material, which cannot be digested in anaerobic
digesters. The organic matter in domestic sewage, on the other
hand, would consist of material that would be more easily
digested by the methanogens. Therefore, with the same quantiy of
organic matter, the two substrates would yield different
quantities of methane. <br>
Yours</div>
<div>A.D.Karve<br>
</div>
<div class="gmail_quote">On Mon, Feb 14, 2011 at 3:24 AM, <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:finstein@envsci.rutgers.edu">finstein@envsci.rutgers.edu</a>></span>
wrote:<br>
<blockquote style="border-left: 1px solid rgb(204, 204, 204);
margin: 0px 0px 0px 0.8ex; padding-left: 1ex;"
class="gmail_quote">Thanks Marcus for your response to my
query:<br>
<br>
<br>
> All,<br>
><br>
> Do you know of (have) a way to "translate" BOD and/or COD
to methane<br>
> potential? It would of course have to be in terms of
BOD/COD removed<br>
> giving rise to so much methane.<br>
><br>
> Mel<br>
<br>
<br>
Hi Mel,<br>
><br>
> if you consider the removed COD is completely transferred
to CH4 in the<br>
> Biogas (CO2=0 COD) you can calculate:<br>
><br>
> 1g COD removed -> 0,25g CH4<br>
> Or 1g COD removed -> 0,35 L CH4 (273K, 1013 mbar).<br>
><br>
> If you want to estimate more exactly you may consider
that some fo the<br>
> removed COD flows into H2 and microbial biomass.<br>
><br>
> Markus<br>
<br>
Your calculation, however, is at odds with the statement in
Grady et al.<br>
1999, page 600 in "Biological Wastewater Treatment 2nd
edition" Marcel<br>
Dekker. The statement is that 4 kg COD removed generates 0.35
m3 of<br>
methane (0.35 L CH4/4 g COD removed). Also that figure or
nearabouts is<br>
found in other documents. Apparently it was derived from
theoretical<br>
calculation (not understood by me) and also from serious
observation of<br>
real systems. If repetition = validity, thhan th figure is
usable.<br>
<br>
Perhaps others can weigh in on the theoretical end, or report
other<br>
"sightings of the translation.<br>
<br>
Mel<br>
<br>
<br>
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</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
***<br>
Dr. A.D. Karve<br>
President, Appropriate Rural Technology Institute (ARTI)<br>
<br>
*Please change my email address in your records to: <a
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<br>
<br>
<pre wrap="">
<fieldset class="mimeAttachmentHeader"></fieldset>
_______________________________________________
Digestion mailing list
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for more information about digestion, see
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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">--
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