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

Frans Somebody franshenn238 at gmail.com
Wed Apr 23 01:12:38 MDT 2014


M. Koettner, thank you for your information on solid separators in Germany.
Do you know of any that work on pure chicken droppings, (egg layers in
cages, tho this might be difficult in Europe with the trend away from
cages!)
I ask this because I think, (but don't know), that pure chicken droppings
is much finer & has fewer solids for the separator to form a 'plug' in the
machine.
Thanks, Frans Henn
On Apr 14, 2014 9:25 PM, "m.koettner" <m.koettner at biogas-zentrum.de> wrote:

> 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
>
> Von Samsung Mobile gesendet
>
> IBBK Fachgruppe Biogas GmbH
> Am Feuersee 6
> 74592 Kirchberg/Jagst
> Mob.: +49-(0)171-1257059
>
>
>
> -------- Ursprüngliche Nachricht --------
> Von: Frans Somebody <franshenn238 at gmail.com>
> Datum:
> 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.
>> Peter.
>>
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