[Digestion] Digestion Digest, Vol 6, Issue 4

[Markus Schlattmann]

Hi Mel,


You can calculate the theoretical COD-demand of CH4:
CH_4 + 2 O_2 -> CO_2 + 2 H_2 O

You  can also take a look at this page I set up some years ago:
http://www.schlattmann.de/biogas/6-simulation/biogas6-umrechnung_csb

With values given in the table you can get the idea of the theoretical 
background to the conversion factors.

Markus

Am 13.02.2011 20:24, schrieb finstein at envsci.rutgers.edu:
> 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
> 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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schlattmann sustainables
schlattmann.de

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85416 Langenbach

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