[Digestion] Digestion Digest, Vol 6, Issue 4

[Markus Schlattmann]

Hi all,

yes, that's true.
But it seems that Mel already is in knowledge of the removed/degraded COD.
So in this case the lignocellulosic material would stay as undegraded 
COD is not relevant COD-input for this estimation.

Markus

Am 14.02.2011 01:29, schrieb Anand Karve:
> Dear All,
>  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.
> Yours
> A.D.Karve
> On Mon, Feb 14, 2011 at 3:24 AM, <finstein at envsci.rutgers.edu 
> <mailto:finstein at envsci.rutgers.edu>> wrote:
>
>     Thanks Marcus for your response to my query:
>
>
>     > All,
>     >
>     > Do you know of (have) a way to "translate" BOD and/or COD to methane
>     > potential? It would of course have to be in terms of BOD/COD removed
>     > giving rise to so much methane.
>     >
>     > Mel
>
>
>     Hi Mel,
>     >
>     > if you consider the removed COD is completely transferred to CH4
>     in the
>     > Biogas (CO2=0 COD) you can calculate:
>     >
>     > 1g COD removed ->  0,25g CH4
>     > Or 1g COD removed -> 0,35 L CH4 (273K, 1013 mbar).
>     >
>     > If you want to estimate more exactly you may consider that some
>     fo the
>     > removed COD flows into H2 and microbial biomass.
>     >
>     > Markus
>
>     Your calculation, however, is at odds with the statement in Grady
>     et al.
>     1999, page 600 in "Biological Wastewater Treatment 2nd edition" Marcel
>     Dekker. The statement is that 4 kg COD removed generates 0.35 m3 of
>     methane (0.35 L CH4/4 g COD removed). Also that figure or
>     nearabouts is
>     found in other documents. Apparently it was derived from theoretical
>     calculation (not understood by me) and also from serious
>     observation of
>     real systems. If repetition = validity, thhan th figure is usable.
>
>     Perhaps others can weigh in on the theoretical end, or report other
>     "sightings of the translation.
>
>     Mel
>
>
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>     for more information about digestion, see
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>     http://www.adelaide.edu.au/biogas/
>     and the Biogas Wiki http://biogas.wikispaces.com/
>
>
>
>
> -- 
> ***
> Dr. A.D. Karve
> President, Appropriate Rural Technology Institute (ARTI)
>
> *Please change my email address in your records to: adkarve at gmail.com 
> <mailto:adkarve at gmail.com> *
>
>
>
>
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> for more information about digestion, see
> Beginner's Guide to Biogas
> http://www.adelaide.edu.au/biogas/
> and the Biogas Wiki http://biogas.wikispaces.com/
>


-- 

Mit freundlichen Grüßen,
Markus Schlattmann

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