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Question 3 (4 marks) Secondary treatment of an operating wastewater treatment plant using the activated sludge process with a 5000m3 tank. The effluent of the

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Question 3 (4 marks) Secondary treatment of an operating wastewater treatment plant using the activated sludge process with a 5000m3 tank. The effluent of the system is 0.25m3/s, the mixed microbial concentration in the aeration tank is 2000mgVSS/L, the microbial concentration in the waste sludge is 8000mgVSS/L. The influent BOD is 210mg BOD5/L, and F/M ratio is 0.44BOD5mgVSS1d1. The cell residence time is 9.5d. What is the hydraulic residence time for this tank

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