[Digestion] Biogas plant at Zoo

[Jörgen Held]

Dear all,

 

Perhaps this is a little bit off-topic but there are good reasons for making
biogas out of human waste.

The fecal matter has to be treated anyway and by anaerobic digestion the
amount of waste is heavily reduced.

In Sweden approx. 600 GWh/year biogas is produced in 135 waste water
treatment plants.

 

The thing with biogas is the multitude of benefits, not only the energy
content in the produced biogas.

-          Waste management (reduce the amount of waste)

-          Nutrient recovery (in fact the digestate is a better fertilizer
than manure)

-          Soil enhancement (the digestate is an excellent soil enhancer in
comparison to combustion of the feedstock)

-          Eliminate the spontaneous methane emissions to atmosphere
associated with traditional manure handling

-          Reducing smell

-          Biogas is a high quality fuel that can be used much more
efficient and with lower emissions than burning the original feedstock.

-          Upgraded biogas are for instance used as vehicle fuel. Quite a
big improvement if one consider the original feedstock


 

The point is that the biogas path offers many advantages of interest for the
future sustainable and environmentally friendly human society. 

 

Best regards,

 

___________________________________

Dr. Jörgen Held

CEO Renewable Energy Technology International AB

Web:  <http://www.renewtec.se/> www.renewtec.se

 

 <http://www.regatec.org/> 440px_Logotype

 

 

 

Från: Digestion [mailto:digestion-bounces at lists.bioenergylists.org] För paul
perrin
Skickat: den 27 juni 2013 22:51
Till: For Discussion of Anaerobic Digestion
Ämne: Re: [Digestion] Biogas plant at Zoo

 

What I have read does say that human waste is pretty useless for biogas (I
saw a figure of 1 cubic foot per day from one humans waste) - but I
understand that animal like elephants have massively inefficient digestion
systems (much food passing through almost entirely undigested) so their dung
will be entirely different and contain much more raw ingredients for biogas
generation (would dried elephant dung even burn?). There is a calculation to
be done, and it can't be based on 'averages' across species.

 

On 27 June 2013 20:28, 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)


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to UNSUBSCRIBE or Change your List Settings use the web page
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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/



 

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