[Digestion] Fwd: After the Tank - pathogens

[David]

Rose,

On 2/19/2012 2:23 PM, envirowagg at comcast.net wrote:
> Has anyone digested carnivore manure and tested the remaining 
> material for canine pathogens (Coccidia, Biardia, Hookworms, Parvo 
> Virus, Roundworms and Whipworms)?  Would the microbes take care of 
> these critters?  We are interested in developing and installing a 
> small module to accommodate waste at dog parks 
> http://www.youtube.com/watch?v=zTBnXx-CMSo&feature=player_embedded 
> <http://www.youtube.com/watch?v=zTBnXx-CMSo&feature=player_embedded>.  
> Pick-up bags would be made of paper or anaerobically digestible film.

There is a lot of literature on the safety of effluent. Basically, at 
ordinary mesophilic temps, destruction of most pathogens requires very 
long retention times-- months. (Parasites are more susceptible to 
mesophilic digestion.) At thermophilic temps-- comparable to the 
temperature inside an active compost pile-- anaerobic digestion can 
destroy pathogens at more ordinary retention times.

Of course, as well, rather than use a word like "destroy", which 
implies a complete absence of the offending organisms, a more 
scientific parlance would be to speak of reduction by factors of ten, 
to levels that are considered safe, even if some members of the 
species in question are still present.

Regardless, at least in my view, the effluent should not be used on 
land where food is grown, and it would be safest if the liquid 
effluent is buried and the de-watered effluent is composted.

There is, to my knowledge, only one paper extant on using dog manure 
to produce biogas: Comparatiw Study of the Potential of Dog Waste for 
Biogas Production, by Okomigwe et al, out of Nigeria.



d.
-- 
David William House
"The Complete Biogas Handbook" |www.completebiogas.com|
/Vahid Biogas/, an alternative energy consultancy |www.vahidbiogas.com

|
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"Make no search for water.       But find thirst,
And water from the very ground will burst."
(Rumi, a Persian mystic poet, quoted in /Delight of Hearts/, p. 77)

http://bahai.us/
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