engineering recuitment GATE CE 2023-24 Test Series Environmental Engineering Sewage Sewage Treatment
An average operating data for conventional activated sludge treatment plant is as follows:
Waste water flow = 30000 m3/day, Volume of aeration tank = 11000 m3, Influent BOD = 250 mg/l, Effluent solid concentration = 30 mg/l, Mixed liquor suspended solids = 2500 mg/l, Waste sludge suspended solids = 9500 mg/l, and Quantity of waste sludge = 220 m3/day.
Calculate the sludge age (in days up to two decimal places).Enter numerical value using the virtual keypad. Round off where necessary.