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Dewatering Methods

2013/7/23 11:14:24      view:

There are many different dewatering methods. These include centrifuges, filter presses, drying beds, sludge lagoons, and gravity and low pressure devices. Each method is described in detail below.


Centrifuges separate solids from liquids through sedimentation and centrifugal force. Solids are fed through a stationary feed tube, accelerated through ports in the conveyor shaft, and distributed to the periphery of the bowl. The bowl, spinning at high speeds, separates the water from the solids which are compacted against the bowl walls. Solids can then be conveyed to additional centrifuge drying stages while the separated liquid is discharged continuously over adjustable weirs at the other side of the bowl.

Figure 1 – Diagram of a typical dewatering centrifuge. Image Credit: Global Environment Centre
Parameter and Performance Correlations for Centrifuges
Performance & Parameters Pool Volume Bowl Speed Conveyor Speed Feed Rate Feed Consistency Temperature Flocculent Usage
Cake Dryness Inverse Direct Inverse Direct Inverse Direct Inverse
Solids Recovery Direct Direct Inverse Inverse Direct Direct Direct
Table 2 – Chart showing the correlation of various centrifuge parameters with key performance outputs of cake dryness and solids recovery. For example, an increase in feed rate will increase cake dryness but decrease solids recovery.