[Digestion] Information about subscriber

[Helge Böhnel]

Frank,

just to comment your reply: We found in aerobic digested compost anaerobic
pathogens (Clostridium botulinum). The may survive and multiply in
microenvironments even in a macroscopic excellent aerobic environment.
Contrary to text books C. botulinum may multiply and produce toxins even
under aerobic conditions. The only chance I see actually would be to use
hydrothermal carbonization of the complete effluent. Apparently it is
exothermic, and could create additional heat. This would mean that
practically all material could be incorporated in the input of a biogas
plant. However, my  main concern is what would happen if there is a leakage
or an accident (burst) of the main digester, or the storage tanks, as it
happened several times in Germany, and what is the health hazard for those
workers in the plant?

Although the question of health hazard was neglected up to now, I believe
that pathogens do not bother.

Helge

 

Von: digestion-bounces at lists.bioenergylists.org
[mailto:digestion-bounces at lists.bioenergylists.org] Im Auftrag von Frank
Shields
Gesendet: Mittwoch, 13. Juli 2011 21:32
An: 'For Discussion of Anaerobic Digestion'
Betreff: Re: [Digestion] Information about subscriber

 

 

Dear Johan,

I agree with Helge and suggest a plan that would aerobically digest the AD
digestate (formulated along with other feedstock) in a compost operation
before application. 

 

Frank Shields

Control Laboratories, Inc.

42 Hangar Way

Watsonville, CA  95076

(831) 724-5422 tel

(831) 724-3188 fax

frank at compostlab.com

www.compostlab.com

 

 

  _____  

From: digestion-bounces at lists.bioenergylists.org
[mailto:digestion-bounces at lists.bioenergylists.org] On Behalf Of Helge
Böhnel
Sent: Wednesday, July 13, 2011 12:02 PM
To: 'For Discussion of Anaerobic Digestion'
Subject: Re: [Digestion] Information about subscriber

 

Dear Johan,

there is a general concern for using biogas digestate: Does it contain
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.

Be careful.

Best regards and good luck

Helge

 

Prof. Dr. Dr. Helge Böhnel

Miprolab

Marie-Curie-Str. 7

37079 Göttingen

Germany

 

Von: digestion-bounces at lists.bioenergylists.org
[mailto:digestion-bounces at lists.bioenergylists.org] Im Auftrag von Johan
Ellingsen
Gesendet: Mittwoch, 13. Juli 2011 09:41
An: 'digestion at lists.bioenergylists.org'
Betreff: [Digestion] Information about subscriber

 

I am a 62 years old Norwegian senior adviser in a Norwegian NGO called
Norges Vel (The Royal Norwegian Society for Development). I am working with
environmental projects within organic farming and climate change. I am an
engineer in chemistry and have been working with agriculture for 30 years,
also on my own organic farm 30 km outside of Oslo. The farm was organic in
1989. We had animals for 10 years, but today we only have cereals and green
manure.  I hope that a new biogas plant for the city  of Oslo can provide
the farm with digestate. I see an unique option to recycle organic food
waste through digesting in a biogas plant, if the quality is acceptable for
organic farming.. 

 

JOHAN G. ELLINGSEN

Seniorrådgiver

Dir. tlf: + 47 64832035

Mobil: + 47 90921568

Johan.ellingsen at norgesvel.no

Postboks 115, N-2026 Skjetten

Telefaks: +47 64 83 20 01

 <http://www.norgesvel.no/> www.norgesvel.no

Beskrivelse: cid:image001.jpg at 01CA8EB4.9173BFE0

 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/digestion_lists.bioenergylists.org/attachments/20110713/1037f794/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 4178 bytes
Desc: not available
URL: <http://lists.bioenergylists.org/pipermail/digestion_lists.bioenergylists.org/attachments/20110713/1037f794/attachment.jpg>