DIG-L: post-treatement of digestates

["Jan Bruneel" <bruneelj.pih@hogeschool-wvl.be>]

Hello,

In Belgium there is a lot of chance that digestates will not be 
allowed to use on land because of the fact that they are considered 
by autorities as products rich in nutrients.  The reason is that also 
the excess of manure in Flanders, which is considered as 
nutrientrich, has to be exported out of Flanders.  In Flanders, 
normally only humusrich-nutrientpoor products wil be allowed to 
use.  Conclusion is that a digestate will have to be treated 
afterwards towards a compost or a pellet. (which is considered as 
humusrich, can be used in Flanders)

Does anyone have good data on the post-treatement of digestates? 
Things that would be of big value are:

Cost of solid-liquid separation, which separation equipment is 
used, which polymers and quantities are used for separation, does 
the type of inputmaterial (manure digestate or biowaste digestate 
for example) used for the biogas process influence the ease of 
separation, is digestate from slaughterhouse waste as easy to 
separate as digestate from biowaste,...

Is the solid fraction easy to compost, is a lot extra structure and N-
rich material needed to abtain good composting,...

what can be done with the liquid fraction, can it be easily stripped 
from nitrogen knowing that it will contain some floating material 
which has not been removed during separation,...

what is the opinion on techniques like inverse osmosis and 
ultrafiltration to treat the liquid fraction, what will the price be for
this kind of treatments,...

To resumate, every information (internetlink, report, cost 
analyse,...) that handels about post-treatement in general would be 
valuable for me.

Best regards, Jan 
-------------------------------------------------------------------------
Jan Bruneel                         | bruneelj.pih@hogeschool-wvl.be     
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Belgium                             | 
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