[Digestion] dry digestion

[Michael Köttner]

Hi Wayne,

if you are interested in commercial dry fermentation we would be a good 
address as we have 12 years of experience with this technology, design and 
planning batch and continous operation technology. You could learn more about 
it on our study tour and training course taking place in Stuttgart at the end 
of March. 

More see under www.biogas-zentrum.de

20-25 m3 size digesters are however possible but only recommended as 
experimental operation as the gas production will be too low to earn good 
revenue to pay back the investment for the plant. With lower investment using 
used parts and existing vessels etc. the safety and emission issue is too 
great to overcome as such a plant is no easy to be approved by the 
authorities. 

Regards

Michael Köttner

---


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Am Sonntag, 12. Februar 2012, 21:15:13 schrieb Wayne Zschech:
> G'day all!
> 
> Greetings from very frozen Ukraine!
> 
> Does anyone have any experience in using dry digestion?  I am planning on
> using food waste and grass, leaves etc. I am hoping to avoid adding water
> which creates a very diluted fertilizer and I presume that there would be
> an increases in energy consumption of trying to keep (or reheat) all that
> liquid in a low solid system.
> I really like the OWS Dranco type of configuration. I have been told that
> the thermophilic reaction is more unstable in general but maybe someone
> still has a working model that is simple enough to run on small scale or
> around 20-25m3.  I am happy to do a multistage process if I can get a more
> concentrated NPK product.
> 
> Please share any info that may be beneficial.
> Blessings,
> Wayne