Evaluation of filter cake properties

While specific cake resistance and filter medium resistances are determined as shown in Section 4.1.4, several other useful values can also be obtained from a filtration test provided sufficient data are recorded. 

As already noted, where values are correctly measured at the end of a filtration 

The volume fraction of solids (solidosity) in a filter cake as defined by 

Where cake compression or deliquoring occurs towards the end of a test equation (4.15) must be modified by substituting (mAtr for av No similar correction can easily be applied to equation (4.14) to account for cake deliquoring as neither the cake thickness nor the mass of solids deposited is usually known as a function of the filtration time. 

The mass of dry cake produced per filter area is a measure of filter capacity and defined by 

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