ENVIRONMENTAL ENGINEERING (Practice Questions) a). State the Ultimate Carbonaceous Oxygen Demand Equation and fully define each term used. b). A wastewater treatment plant serving a city of 200,000 persons discharges 1.10cu.m/s of treated effluent having an ultimate BOD of 50.0mg/L into a stream that has a flow of 8.070cu.m/s and a BOD of its own equal to 6.0mg/L. The deoxygenation constant, kd, is 0.20/day. i. Estimate the ultimate BOD of the river just downstream from the outfall. State any assumptions made. (7 marks) ii. If the stream has a constant cross section, so that it flows at a fixed speed equal to 0.30m/s, estimate the BOD remaining in the stream at a distance 30.0km downstream. GIVEN: Lt = L0e-kdt
ENVIRONMENTAL ENGINEERING (Practice Questions)
a). State the Ultimate Carbonaceous Oxygen Demand Equation and fully define each term used.
b). A wastewater treatment plant serving a city of 200,000 persons discharges 1.10cu.m/s of treated effluent having an ultimate BOD of 50.0mg/L into a stream that has a flow of 8.070cu.m/s and a BOD of its own equal to 6.0mg/L. The deoxygenation constant, kd, is 0.20/day.
i. Estimate the ultimate BOD of the river just downstream from the outfall. State any assumptions made. (7 marks)
ii. If the stream has a constant cross section, so that it flows at a fixed speed equal to 0.30m/s, estimate the BOD remaining in the stream at a distance 30.0km downstream.
GIVEN: Lt = L0e-kdt
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