Q.2: A slurry containing 100 kg of whiting, per m of water, and, is filtered in a plate and frame press, which takes 900 s to dismantle, clean, and re-assemble. If the cake is incompressible and has a voidage of 0.4, what is the optimum thickness of cake for a filtration pressure (-AP) of 1000 kN/m? The density of the whiting is 3000 kg/m'. The resistance of the filter medium may be neglected and the viscosity of water is 1 mNs/m. In an experiment, a pressure difference of 165 kN/m- produced a flow of water of 0.02 cm /s through a centimeter cube of filter cake