[Digestion] gasyield indigenious cowdung

Anand Karve adkarve at gmail.com
Mon Oct 25 17:36:54 PDT 2010


Dear Mr. Hankel,
 I had already reported that there was a  firm in India, which constructed
biogas plants of this type.  The figures calculated from the data presented
by the firm showed that it took 2.5 kg dung to generate 1 cubic meter of
biogas. Based on this calculation, one would get about 400 cubic meters of
biogas from 1000 kg dung . This is also an unbelievably high value. The firm
recommends emptying and refilling the digester once every 4 to 5 months and
not 6 months.
I think that the dung used in the biogas plant in Centre of Science for
Villages in Wardha could have been stored outside over a certain period of
time, so that it lost some moisture. Secondly, when the dung is collected
from the stall, it also contains a certain quantity of straw and fodder
residues.  I don't think that it was accurately weighed before filling it
into the biogas plant. The 1000 kg weight of dung reported to us was an
approximation, based on the size of the digester tank.
Yours
A.D.Karve

On Mon, Oct 25, 2010 at 11:21 PM, klauspeter Hankel <kapehankel at gmx.de>wrote:

> I suggest, please calculate based on ...
> indian bovine manure: 18% DS, 83% vDS, 300 l biogas/kgvDS, 60% CH4
>
> and better check the DS and also sometimes the vDS (because of sand and
> soil, if you buy by weight)
>
> warm regards / mit herzlichen Gruessen
>
> Klaus Peter Hankel
>
>
> Message: 1
> Date: Mon, 25 Oct 2010 19:04:35 +0530
> From: Awadhoot Bapat <abjobapat at gmail.com>
> To: For Discussion of Anaerobic Digestion
>    <digestion at lists.bioenergylists.org>
> Subject: Re: [Digestion] Digestion Digest, Vol 2, Issue 40
> Message-ID:
>    <AANLkTi=SQL-3McMa7rnywmCxqLFtubX=geJ8fMaiU09C at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear All ,
>
> 540 M3 from 1000 Kg of cow dung ?
> Is it possible that  there is an error in measurement ? OR an enthusiastic
> overstatement  by the gentleman ?
> ( If cow dung or the flora present in /alongwith it had so much of energy
> value ,,,, it would create so many possibilities )
>
> Regards,
> Avadhut Bapat
>
>
>
> On Mon, Oct 25, 2010 at 2:27 PM, Markus Schlattmann
> <firmen at schlattmann.de>wrote:
>
> > Hi,
> >
> > when you compare the yields based on fresh mass, are you sure you're
> > talking about the same "dung"?
> >
> > Here in Central Europe cattle often are kept in stables leading to liquid
> > (~8%TS) manure.
> > In India perhaps "dung" is "dried dung"?
> > Generally, for comapring gas yields of substrates it's better to compare
> > gas yields based on VS, not fresh matter, since water content may vary a
> > lot.
> >
> > I can't think that there's a production of 18 times more biogas if we are
> > talking about comparable dung. You may calculate/estimate a C-Balance. If
> > there's one loading, you can't get more C in CH4/CO2 out of the system
> than
> > you have put into it with the substrate/inoculum in the beginning.
> >
> > Markus Schlattmann
>
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>
>


-- 
***
Dr. A.D. Karve
President, Appropriate Rural Technology Institute (ARTI)

*Please change my email address in your records to: adkarve at gmail.com *
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