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A design developed in the UK by the WRc (Warden, 1983), for waterworks sludge thickening applications, consists of a cylindrical tank of water depth 2–3.5 m with a shallow sloping floor (1 in 20). Sludge is introduced at a central feed well and the supernatant overflows a peripheral weir.
The main thickening processes for sludge treatment are based on the following: Gravity: The sludge enters in the central area; the thickened sludge collects in the lower part and the supernatant is left in the upper part.
