Dewatering theory

There is an additional pressure drop across the cake, developed by electroosmosis, which leads to increased flow rates through the cake and further dewatering at the end of the filtration cycle. The filtration theory proposed for electrofiltration assumes the simple superposition of electroosmotic pressure on the hydraulic pressure drop. 

Z R Comparisons of theory and experimental data for constant pressure filter cycles involving filtration, washing and dewatering of 10% v/v calcite suspensions. 

Hysteresis is found not only in sorption processes but also in the dewatering of porous media and the magnetization of ferromagnetic materials. A fundamental feature of hysteresis is that it is rate independent [24,30]. A traditional treatment of hysteresis by memory integrals [Volterra operators] is thus not possible. An elegant theory for equilibrium hysteresis has been put forward by Everett and coworkers [25-29]. This theory is based on the representation of hysteric phenomena by means of a large number of microdomains. 

The theory of the separation and dewatering behaviour of the decanter is described in Chapter 4. 

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