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

Tue Feb 21 12:54:57 CST 2012

David, Wayne, Raul, Anard - Thank you very much for your knowledgeable responses and resources regarding dog waste digestion.  This information  will be very helpful for us as we pursue our Park Spark demo. 

Rose Seemann 
Aurora, CO USA 
----- Original Message -----
From: "Martins" <rvm at sti.com.br> 
To: david at h4c.org, "For Discussion of Anaerobic Digestion" <digestion at lists.bioenergylists.org> 
Sent: Monday, February 20, 2012 4:40:21 AM 
Subject: [Digestion] RES:  Fwd:  After the Tank - pathogens 

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&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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