1. A laboratory settling analysis has been performed on a suspension exhibiting flocculent (type 2) sedimentation with the results given in the following table. The column had a diameter of 14 cm and a total depth of 2.4 m, with sampling ports spaced every 0.6 m. The initial concentration of suspended solids 480 mg/L. Time, min Depth (60 cm) Depth (120 cm) SS Concentration, mg/L Depth (180 cm) 5 385 420 438 10 334 379 405 20 265 330 355 30 216 279 315 40 180 250 280 50 154 213 251 60 123 182 217 75 106 148 192 a) Prepare the following graphs (list data used in preparing the graphs in tables): Percentage SS removed v/s time Isoremoval curves (iii) Total % removal v/s detention time (iv) Surface overflow rate v/s detention time b) Size a primary clarifier for 50% removal based on the data in (a): The design flow rate is 4000 m³/d. What will the underflow rate from the clarifier be if solids are compacted to a 1.5% concentration? Use safety factor of 1.5 for the detention time and surface overflow rate of the clarifier, respectively. c) If the volumetric flow rate doubles but the concentration and settling characteristics of the suspended solids do not change, what is the expected total removal? What is the expected removal if the flow rate is increased by 10%?