[Digestion] RES: Fwd: After the Tank - pathogens

[Martins]

Hi David and Rose:

 

David, you went to the point I told nothing about in my last message.

It is "retention time".

In a multi chamber digester, we have a minimum retention time of 60 days,
and that is the reason for pathogens to be eliminated.

In several studies I made many years ago, with a six chamber digester, I
found 60 days to be a sufficient time, but you can add more anaerobic
chambers for insurance.

My goal at that time was to use biofertilizer in the preparation of nutrient
solutions for organic hydroponics.

>From those studies I developed the Geo-hydroponics or Geoponic System that
works extremely well.

Besides that, diluted biofertilizer proved to be an excellent foliar
nutrient, and at the same time  it acts as a very good organic agro toxic.

Concentrated or diluted biofertilizer proved to be extremely good in edible
mushrooms production, using sand as substrate.

We tested other substrates like straws (except rice straws, as it contains
too much Aluminum), vermiculite and expanded clay.

I think that mushroom production based on biofertilizer is something to be
more tested and studied.

But all is based on a biofertilizer got from a multi chamber digester.

Chinese and Indian kinds of biodigesters are not suited, as they don't give
us a complete biodigested biomass.

 

Regards

 

 

Raul Vergueiro Martins

rvm at sti.com.br

www.hydor.eng.br

SKYPE - martins.raul

 

De: digestion-bounces at lists.bioenergylists.org
[mailto:digestion-bounces at lists.bioenergylists.org] Em nome de David
Enviada em: domingo, 19 de fevereiro de 2012 20:28
Para: For Discussion of Anaerobic Digestion
Assunto: Re: [Digestion] Fwd: After the Tank - pathogens

 


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
<http://www.youtube.com/watch?v=zTBnXx-CMSo&feature=player_embedded>
&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

"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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