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Digestate treatment at industrial biogas plant is a challenge. Biogas process releases nutrients and lots of solid organic matter is present in the stream after the digestion. Separation of solid fraction and water is extremely challenging.  Reject water after the dewatering tends to be very concentrated. Compounds in reject cause severe problems when treating the waste water at municipal waste water treatment plant. In the worst case it can reduce the efficiency of nitrogen removal causing nutrient releases into the recipients.

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