Qn 2) In a batch sedimentation experiment on a slurry of solid concentration 30 kg/m3, the interface heights are measured at various times and tabulated as: Time(min): 0 5 15 25 35 45 55 70 Height (cm): 100 90 70 50 32 25 22 21 (a) Determine the solid settling velocities at the interface between suspension and clear liquid and the corresponding solid concentrations at t = 15, 25, 35, 45, 55, 70 min.2 (b) A continuous thickener is used to treat the same slurry at a rate of 0.04 m3/s. If the underflow solid concentration is 80 kg/m3, determine i) the rate limiting concentration in the sedimentation tank below the feed point and the corresponding total settling flux. ii) the area required for the sedimentation tank if 10% over design is assumed.