[Digestion] gasyield indigenious cowdung

klauspeter Hankel kapehankel at gmx.de
Mon Oct 25 08:21:45 PDT 2010

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
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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 )

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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