$6-12$ The following data were collected in the laboratory on the filtration of

a $CaC{O}_3$ sludge through a washing plate$-$and$-$frame filter press. After

assembling the press, the data were taken by noting the time required for

the collection of succeeding $2\mathrm{.}27kg$ batches of filtrate.

Area of filter surface: $,0\mathrm{.}174m^2$

Feed concentration: $5$ percent CaCO$3$ in water

Pressure at filter inlet: $,4\mathrm{.}14{10}^{6}Pa$

Determine $$ and $V_e$ for the filtration of this slurry in this filter press.