A wastewater stream is treated biologically by using a reactor containing immobilized cells in porous particles. Variation of the rate of substrate consumption with particle size is given in the following table. rs (mg/l-h) Dp (mm) 1 300 300 2 250 3 200 4 150 5 100 50 7 10 a. What are the effectivness factors for Dp = 4 mm and Dp = 7 mm? b. The following data were obtained for DP= 4 mm at different substrate concentrations. Assuming no liquid film resistance, determine the rm and Ks for the microbial system. So (mg/l) rs (mg/L-h) 100 85 250 200 500 360 1000 630 2000 1000