Question 6 Design a circular primary sedimentation basin for a town with a population of 45000 people. Assume the wastewater flow is 400L /person d. Design the tank for a nominal detention time of 2hrs and (nominal) overflow rate of 36m3/m2d at average flow. Determine the tank depth and diameter given the tanks can be constructed in diameter increments of 1m and depth increments of 0.5m. Repeat the design considering 2 tanks. Prepare a summary table reporting the weir loading as m3/m.d, and the % deviation from the nominal detention time and overflow rate for each case. Comment on how the basin design may be modified to accommodate sludge thickening in addition to particulate removal