dec 14, 2015 the difference between a clarifier and a thickener is subtle as they will visually look the same. fundamentally, thickeners and clarifiers are both used to settle solids which results in the separation of liquids and solids. thickeners are used to concentrate solids, while clarifiers are used to purify liquids.,plc control gravity sludge thickener no clog high,high efficiencyrotary slurry thickener automatic sludge dewatering screw press sewage treatment machine. application activated sludge dewatering, especially for oily sludge. capacity 1-300 ds-kg/hr. weight 110 kg. power 0.2 kw. stable performance gravity belt thickener for etp/ sewage treatment plant.