[Digestion] Biogas plant at Zoo

[Alexander Eaton]

Dr. Karve,

You have held this stance in many past posts, comparing starch to waste,
and arguing waste as not an ideal feedstock for AD.  I have always thought
that your point is valid, but a bit academic and missing the fact that AD
systems can be seen as an extension of the animal digestive system,
treating waste further and extracting energy that has not been used.
 Clearly starch creates more gas, but the questions posed here is not about
choosing starch or animal dung for a digester, it is about whether a zoo
would be wise to consider a digester to treat animal waste and recover
energy.  Is dedicating space and time at a zoo to dehydrating animal dung
and then developing a system to burn it and recover the energy really a
better alternative than an AD system?  From an energy and process balance,
can you explain a system that would perform better than a digester in this
context?

Best,

A




On Thu, Jun 27, 2013 at 2:28 PM, Anand Karve <adkarve at gmail.com> wrote:

> Dear Rabin,
> all animals, including humans, function as live biogas plants. The fecal
> matter represents slurry coming out of a biogas plant. Using animal dung as
> feedstock in a biogas plant is a highly inefficient way of producing
> biogas. You get about 800 litres biogas from just 1 kg starch. To get the
> same amount of biogas from cattle dung, you need 40 kg of it. One gets much
> more energy from dung if it can be dehydrated and burned directly
> Yours
> A.D.Karve
> On Wed, Jun 26, 2013 at 11:35 AM, Rabin Shrestha <rshrestha at winrock.org.np
> > wrote:
>
>>  Hello,****
>>
>> ** **
>>
>> Will it be a good idea to install biogas plant at zoo to manage and
>> generate energy from the animal waste in the zoo???****
>>
>> ** **
>>
>> Regards,****
>>
>> Rabin****
>>
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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/
>>
>>
>>
>
>
> --
> ***
> Dr. A.D. Karve
> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
>
>
> _______________________________________________
> Digestion mailing list
>
> to Send a Message to the list, use the email address
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>
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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/
>
>
>


-- 
Alexander Eaton
Sistema Biobolsa
IRRI-Mexico
RedBioLAC

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