[Digestion] AD of rabbit manure

[edgar]

You could use a biodegradable oil to reduce the surface tension of the 
bubbles, but be careful not to generate an organic overload e.g. spent 
cooking oil, or biodiesel should do the job, I have sucessfuly done this 
while the feed regime was sorted in a full-scale plant. A very common 
cause of foaming is the feeding regime, if possible try and feed in as 
many batches as possible, rather than on few events of high loading.

Edgar

Peter Allison wrote:

>Hi All,
>I'm at present digesting rabbit manure in a one ton pilot plant to assess
>gas output and the quality of the spent supernatant. I introduced about
>10kgs of calcium hydroxide Ag-lime to increase pH after acidification. The
>plant is producing plenty of methane and biological activity but also plenty
>of foam, similar to what they use for extinguishing liquid fuel fires. Does
>anyone know of an organic based de-bubbling fluid I could use to collapse
>the foam discharge? It's fouling my gas lines and creating havoc.
>Stand back! I think she is ready to blow!
>Help!
>PA
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