D) Design the circular sedimentation with the same SOR of rectangular sedimentation tank with dimensions (L-15m W=8.8446m depth=3.5m), treating wastewater for a community of area 5km² and population density is 5000cap/km², the average waste water generated per day is 300L/cap, T=2hr. b)Determine the overflow weir loading rate at average flow and maximum flow. c)The suspended solids concentration in the primary sedimentation effluent flow, removal efficiency of the tank 30%, suspend solids influent flow=800ppm.

In a 10 m side square shaped sedimenta- tion tank, the flow rate is 100 cum/h, and if the depth of water is 2 m, the detention time (h) is: (a) 3 (c) 2 (b) 1 (d) 4

A conventional Wastewater Treatment Plant receives an average daily wastewater flow of 38,000 m2/d. Two circular primary clarifiers, operating in parallel, will treat the flow. Assume that a peripheral effluent weir is used for each clarifier. Consider a detention time of 2 hours and water depth of 4 meters for each clarifier. Determine: a. The diameter (m) of each primary clarifier. b. The weir loading rate (m3/d . m) for each clarifier at average daily flow. c. The expected (not calculated) BODs and Suspended Solids removal efficiencies (%) at an average daily flow rate.