Particle Technology

Filtration

Problems 4.10

Question 2.v
The water retained in the cake was 200 ml, solids present was 200 ml, filtrate volume was 4600 ml.


Five litres of a 10% w/w slurry of chalk (density of 2670 kg m-3) in water (viscosity of 0.001 Pa s) was filtered under constant pressure on a filter leaf of 0.0314 m2 area. The specific surface of the chalk is 3x106 m-1 and the cake can be assumed to have had a porosity of 50%.


The dry mass solids in the cake per unit volume of filtrate (i.e. the same as 'c' in the filtration equations) was (kg m-3):

a) 112
b) 100
c) 116
d) 2670

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