Decanter centrifuge are continuous type liquid-liquid and liquid-solid separation centrifuges. Their design includes, A Screw Conveyor and Bowl assembly (eccentric) rotates at high speed generating high centrifugals forces (thus increasing g value), which accelerate sedimentation / settling. The solids settle near the bowl wall and are conveyed to solids discharge by screw rotating at different speed in bowl. The decanter centrifuge is the only sedimentation centrifuge designed from the start to handle significant solid concentration in the feed suspension. At the same time it can achieve quite good degrees of clarification of the liquid concentrate. Although a complicated piece of machinery it embodies a simple principle. They consist basically of a horizontal cylindrical bowl (1) rotating at a high speed, with a helical extraction screw (2) placed coaxially. The screw perfectly fits the internal contour of the bowl, only allowing clearance between the bowl and the scroll. The differential speed between screw and scroll provides the conveying motion to collect and remove the solids, which accumulate at the bowl wall.The screw speed is adjustable and can be changed to achieve specific output like clearer liquid and/or drier solids. This type of centrifuge mostly used in different density liquid-liquid separation. They are also used with low-solid % slurry liquid-solid separation.

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