Question 5: [20 marks The activated sludge bioreactor facility of a certain plant is to be expanded. The results of a settling cylinder test of the existing bioreactor suspension are shown in Table 95. The total flow feed to the clarifier (Q+Q:) is 10,000 m/d and the influent MLSS is 3,500 mg/L. The limiting solids flux (SFL) is 2.2 kg/m.h. i) Draw the gravity solids flux curve (SF) using the batch settling data given in Table Q5. [8 marks] ii) Determine the underflow concentration in mg/L. [2 marks] iii) Determine the clarification area required in m. [7 marks] iv)Determine the thickening area required in m. [3 marks] Table Q5 Initial solids concentration 1410 2210 3000 3500 4500 5210 6510 8210 (MLSS) in mg/L Initial interface settling velocity (V/) in m/h 2.93 1.81 1.20 0.79 0.46 0.26 0.12 0.084