45 An activated sludge with a suspended solids concentration

45 An activated sludge with a suspended solids concentration of 3,000 mg/L is settled in the secondary clarifier. The secondary sludge removed has a suspended solids concentration of 1.5%. wastewater flows into the secondary clarifier process at the rate of 120 cubic meters per minute. a) Calculate the total volume of wastewater going into the secondary clarifier each hour b) Assuming that all the solids entering the sedimentation tank are settled, calculate the percent volume c) Calculate the total volume of secondary sludge that is pumped from the secondary clarifier each hour d) Calculate the sludge flow rate and the clarifier effluent flow rate (in m3min). reduction that would have been achieved to produce the secondary sludge. for the secondary sludge in b. 46 A Belt press handles 0.58 MGD of sludge having a solids concentration of 12,350 mg/L. The belt press concentrates the sludge to 25%. All of the water that is removed from the sludge is returned to the headworks of the treatment plant. a) Calculate the percent volume reduction that is achieved. b) Calculate the flow rate of the water in the return flow CENE 150L Introduction to Environmental Engineering Computations (Lab) 2 of 2 47 Rework problem 46 using 1.063 as the specific gravity for the dewatered sludge. In addition, calculate c) the relative percent difference in volume reduction between these two problems

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