A process for the sludge treatment with the step of anaerobic treatment (26) of sludge, characterized by removing a portion (3) of digester sludge from the anaerobic treatment (26), hydrolysis (2) of organic sludge (1) and supplying the from the anaerobic treatment (26) removed portion (3) of digester sludge in the organic sludge (1), into the process of the hydrolysis (2) and / or in the hydrolyzed organic sludge (4) as well as subsequent deposition (7) of nitrogen compounds from the hydrolyzed organic sludge (4) mixed subset (3) of the digested sludge is removed from the anaerobic treatment, and returning the the nitrogen content reduced portion (3) of the digested sludge is removed in the anaerobic treatment (26).
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