Dewatering

The objective of dewatering a fiber suspension in stock preparation is to separate the solids in the suspension from the water and dissolved ingredients. The reasons for dewatering the suspension are technological and economic. They are mainly [Pg.186]

Dewatering is a filtration process where a suspension stream of consistency d is divided by a filter into a thickened part with a consistency of Ct and a filtrate stream of consistency Cf. At the start of filtering the retention of the solids on the filter is lowest. With time mat thickness increases, as does retention, which means that the solids content in the filtrate decreases. Dewatering usually aims for zero consistency in the filtrate, which in practice is not reached as retention is never 100%. In contrast, washing takes advantage of this effect for solid/solid separation. [Pg.186]

Various types of machines are used for dewatering in stock preparation Drum filters, belt filters, twin wire presses, disk filters, and screw presses, as well as static filters such as inclined and curved screens. They can differ in several aspects such as [Pg.186]

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