The invention relates to a device for thickening or dewatering sludge, watery sediments or the like, especially surplus sludge in sewage treatment plants. Said device is characterised in that it comprises a double-threaded or multi-threaded eccentric screw pump (10) having a shaft (14) on one end and a suction connection for fluid sludge (28) at the other end, a drive device which is coupled to the drive shaft (14, 18), and a transporting means which is arranged between the eccentric screw pump and the drive device, is driven by the drive device and is arranged in a longitudinal housing (16) through which the shaft (14) extends. A separating device in the form of a perforated cylinder (22) is arranged in said housing and is used to separate the sludge and the liquid. The inventive device also comprises a filtrate outlet (26) which is situated on the upstream side of the perforated cylinder, a thick sludge outlet (26a) which is situated on the downstream side of the perforated cylinder, and a supply device for a flocculent, said supply device being connected to the suction connection (28) of the eccentric screw pump and/or to the connecting region between the eccentric screw pump (10) and the perforated cylinder (22). The perforated cylinder (22) is rotatably positioned about its axis and can be rotatably driven by the drive device. The perforated cylinder comprises transporting elements on the inner wall, for transporting the sludge to the thick sludge outlet.
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