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

m.koettner m.koettner at biogas-zentrum.de
Mon Apr 14 13:23:57 MDT 2014

Hi Frans,

Here in Germany with our 8000 Biogas Plants you can see such a liquid solid seperator at almost every modern biogas plant. They usually deliver quite good results with a 30% DM solid fraction and a 5% DM liquid fraction. These plants can be visited and the farmers can be asked about their experiences. 

Mit freundlichen Grüßen/Kind Regards

Michael Köttner Geschäftsführer/CEO

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IBBK Fachgruppe Biogas GmbH
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-------- Ursprüngliche Nachricht --------
Von: Frans Somebody <franshenn238 at gmail.com> 
An: For Discussion of Anaerobic Digestion <digestion at lists.bioenergylists.org> 
Betreff: Re: [Digestion] Digestion Digest, Vol 44,	Issue 7 filtering digestate 
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.

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