After steady-state has been reached,
the samples from the feed, centrate and cake were taken
at least in duplicate (for averaging purposes). The samples were
dried in an oven overnight at which the solids concentration for
the sample was determined by gravimetric analysis. Based on the
solids concentration (by dry weight basis) in the feed Wf, centrate
We, and cake Ws, respectively, the solids recovery Rs can be calculated
from material balance [4]