A stream with a flow of 1.7 m3/s and BOD 3.4 mg/l is saturated with DO (9.27 mg/l at 20oC). It receives a treated effluent discharge from a cocoa processing factory of BOD 6780 kg/day and DO of 5.0 mg/l. The BOD of the stream immediately after mixing is 7.6 mg/l. The DO at a point 36 km downstream is 7.20 mg/l. The average velocity of the stream flow is 0.2 m/s. Determine the flow and the BOD in mg/l of the treated effluent discharged from the cocoa processing factory into the stream. Assume the temperature is 20oC throughout, k1 for effluent/water mixture is 0.1/day, k2 for stream is 0.4/day.
A stream with a flow of 1.7 m3/s and BOD 3.4 mg/l is saturated with DO (9.27 mg/l at 20oC). It receives a treated effluent discharge from a cocoa processing factory of BOD 6780 kg/day and DO of 5.0 mg/l. The BOD of the stream immediately after mixing is 7.6 mg/l. The DO at a point 36 km downstream is 7.20 mg/l. The average velocity of the stream flow is 0.2 m/s. Determine the flow and the BOD in mg/l of the treated effluent discharged from the cocoa processing factory into the stream. Assume the temperature is 20oC throughout, k1 for effluent/water mixture is 0.1/day, k2 for stream is 0.4/day.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A stream with a flow of 1.7 m3/s and BOD 3.4 mg/l is saturated with DO (9.27 mg/l at 20oC). It receives a treated effluent discharge from a cocoa processing factory of BOD 6780 kg/day and DO of 5.0 mg/l. The BOD of the stream immediately after mixing is 7.6 mg/l. The DO at a point 36 km downstream is 7.20 mg/l. The average velocity of the stream flow is 0.2 m/s. Determine the flow and the BOD in mg/l of the treated effluent discharged from the cocoa processing factory into the stream. Assume the temperature is 20oC throughout, k1 for effluent/water mixture is 0.1/day, k2 for stream is 0.4/day.
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