[Digestion] Digestion Digest, Vol 44, Issue 7 filtering digestate

Frans Somebody franshenn238 at gmail.com
Sun Apr 13 02:32:20 MDT 2014


Hi Peter.
thanks for your input, I had thought of a centrifuge, (being an ex dairy
farmer used them to separate the cream!) but having done some reading, size
(to hold the solds) is an issue.
What of screw expellers? The Far east sell a lot, (call them de-waterers)
all of which they say will work, but can not tell me where one is working.
1 Co in South Africa also makes, & guarantees it will work with droppings,
but can not show me one that does, & when asked to put that in writing &
take it back if it does not...guess what!
At this stage cost is not an issue, at least it is a place to start & if I
have to travell 1/2 way round the globe to see one working I will do so.
Thanks again, and anyone else out there with any ideas.
Thanks, Frans
 On Apr 13, 2014 9:12 AM, "PETER ALLISON" <pm.allison at bigpond.com> wrote:

> Hi Frans Somebody, I spent ages developing means to filter digestate until
> I discovered I was wasting my time. It is not filterable, it will always
> clog any static screen. The digestate is full of very fine fiber and will
> bridge any hole, pore or oriface. Do not go there. Have had success with
> vibro-filtration of slurry thru a 3mm screen to remove extraneous debris
> then centrifuge the liquid/digestate as a spill-over process. The
> centrifuge needs to be able to hold a reasonable quantity of mud before
> having to be emptied. The refined liquid still holds some very fine fluffy
> matter. I change the pH to enable a complete separation of colloids from
> particulates. The liquid is able to be sprayed normally and the remainder
> is formulated and pelletized for broadcast.
> Peter.
>
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