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Seperating sand from dry chicken manure for AD

Seperating sand from dry chicken manure for AD

(OP)
Hello all,

I'm principally interested in possibilities to seperate sand from (esp. chicken) manure.
The desanded fraction will be used for anaerobic digestion, so we have the following requirements:
as little organics/VS in the sand as possible
a TS content in the de-sanded fraction in a range of 10-20% (ideally)

The state of the art seem to be cyclones, centrifugues and gavity settling. While I found no numbers, all seem to require the feedstock to be diluted to ~1% TS - violating my condition 2. Is this dilution correct?

As of now, I'm not sure there's a satisfactory answer - what have I missed?

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