Abstract: The invention relates to a method for separating solids and liquids in suspensions, in particular sewage sludge (K), said method working by adding flocculants (F1) and/or flocculating agents. The suspension, in particular the sewage sludge (K), is observed by means of a sensor (S1). In a first method step, flocculants (F1) and/or flocculating agents are added to a first mixing stage (M1) until the sensor (S1) detects the formation of first flocs. The addition of the flocculant (F1) and/or the flocculating agent is then interrupted so that the suspension, in particular the sewage sludge (K), has a defined, specifically a first, floc-comprising state at that moment. The suspension, in particular the sewage sludge (K), is now fed to a further mixing stage (M2, MM).

Abstract: The invention relates to a method and an arrangement for wastewater treatment, in which at least portions of the sewage sludge contained in the wastewater (0) are subjected to a hydrolysis (8). The hydrolysis (8) is carried out as a thermal hydrolysis. After the hydrolysis step (8), a drying process is (19) carried out. The drying process (19) is a process operating with positive pressure in the steam region. At least parts of the steam resulting from the drying process (19), which operates with positive pressure, are fed (20) to the portions of the sewage sludge in the thermal hydrolysis (8).