A wastewater treatment Plant discharges 1.0 m/s of effluent having an ultimate BOD of 40.0 mg//L...

 

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A wastewater treatment Plant discharges 1.0 m³/s of effluent having an ultimate BOD of 40.0 mg//L into a stream flowing at 10.0 m³/s and a constant cross-sectional area of 55 m². Just upstream from discharge point, the stream has an ultimate BOD of 3.0 mg/L. The deoxygenation rate K is estimated at 0.22/day (in base e) and reaeration rate is negligible. 1. Assuming instantaneous mixing, what is the ultimate BOD of the mixture at point of discharge? 2. What is the BOD utilized from the point of discharge to a point 10,000 m downstream? A wastewater treatment Plant discharges 1.0 m³/s of effluent having an ultimate BOD of 40.0 mg//L into a stream flowing at 10.0 m³/s and a constant cross-sectional area of 55 m². Just upstream from discharge point, the stream has an ultimate BOD of 3.0 mg/L. The deoxygenation rate K is estimated at 0.22/day (in base e) and reaeration rate is negligible. 1. Assuming instantaneous mixing, what is the ultimate BOD of the mixture at point of discharge? 2. What is the BOD utilized from the point of discharge to a point 10,000 m downstream?