Particles of 20 um diameter settle at a velocity (vs) of 0.5 m/hr in a sedimentation basin of 10 m width (W), 3 m depth (H), and 60 m length (L). The water flow rate (Q) is 450 m/hr. w Vs L a) Model the basin with no horizontal or vertical mixing and calculate the removal efficiency (n) for these particles. First write mass balance equation. mass balance eq: . % b) Model the basin as a plug flow reactor (PFR), mixed vertically but not horizontally and calculate 9. First write mass balance equation. mass balance eq: % c) Model the basin as a continuously mixed flow reactor (CMFR) and calculate n. First write mass balance equation. mass balance eq: : %