[Digestion] pathogens which might create a health hazard

['Mark Wells']

As far as I know, in the EU and especially Nordic countries where digestate
is used as a biofertilizer, regulations only require pasteurization of
abattoir waste?  

In South Africa where we are operating, sludge management guidelines require
pasteurization of sewage sludge.

Pasteurization is generally considered not necessary if you use a
thermophilic high temperature AD process.

Regards

Mark 

  _____  

From: digestion-bounces at lists.bioenergylists.org
[mailto:digestion-bounces at lists.bioenergylists.org] On Behalf Of Alexander
Eaton
Sent: 13 July 2011 10:54 PM
To: For Discussion of Anaerobic Digestion
Subject: Re: [Digestion] pathogens which might create a health hazard

 

Just to add a dimension to this conversation, are the true risks of
pathogens in the digester effluent so high as to justify pasteurization?  I
understand that the majority of the microbiotic activity in effluent to be a
positive addition to the soil.  I ask because so many government officials
seem to fixate on this point, when I have not really seen data that shows
high enough probability of dangerous pathogens to justify extreme measures.
The smallish risk seems reasonable for the benefits of a more living organic
fertilizers.  Obviously the input material has a lot to do with this aspect,
but generally I am interested to hear responses.  

Cheers

A 

On Wed, Jul 13, 2011 at 1:55 PM, Johan Carels <carelsjohan at telenet.be>
wrote:

Dear Johan,

Regarding  “pathogens which might create a health hazard. There are reports
on pathogens for man, animal, and plant, which might survive the biogas
process. As  the input material of any biogas plant which is not operated on
a farm level may contain many different types of pathogens you may
accumulate these germs even if they are in a low number in the digestate.”

 

Suggest to pasturise  ( heating at 70°C during 60 minutes)  all the
digestate since you hav e this heat available from the cogenerater [cooling
water, turbocooling, exhaust gase-heat]. This will kill all pathogens.

 

K rgds

Johan Carels

www.jcarels.be

 


_______________________________________________
Digestion mailing list

to Send a Message to the list, use the email address
Digestion at bioenergylists.org

to UNSUBSCRIBE or Change your List Settings use the web page
http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergyli
sts.org

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

Mex cel: (55) 11522786
US cel: 970 275 4505

alex at irrimexico.org
alex at sistemabiobolsa.com

sistemabiobolsa.com
www.irrimexico.org
www.redbiolac.org

No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.901 / Virus Database: 271.1.1/3762 - Release Date: 07/13/11
08:34:00

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/digestion_lists.bioenergylists.org/attachments/20110714/3e78e860/attachment.html>