Problem 1.12 (modified), Masters and Ela, Introduction to Environmental Engineering and Science, 3rd Ed.: The two-pond system shown in the figure below is fed by a stream with flow rate of 2.5 million gallons per day (MGD) and a BOD (a nonconservative pollutant) concentration 12 mg/L. The rate of decay of BOD is 0.43/day. The volume of the first pond is 6.5 million gallons (MG), and the second is 3.5 MG. Assuming complete mixing within each pond, find the BOD concentration leaving each pond. 12 mg/L 2.5 MGD V₁ = 6.5 MG C₁ = ? V₂=3.5 MG C₂ = ?

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Problem 1.12 (modified), Masters and Ela, Introduction to Environmental Engineering and
Science, 3rd Ed.:
The two-pond system shown in the figure below is fed by a stream with flow rate of
2.5 million gallons per day (MGD) and a BOD (a nonconservative pollutant) concentration
12 mg/L. The rate of decay of BOD is 0.43/day. The volume of the first pond is 6.5 million
gallons (MG), and the second is 3.5 MG. Assuming complete mixing within each pond, find
the BOD concentration leaving each pond.
12 mg/L
2.5 MGD
V₁ = 6.5 MG
C₁ = ?
V₂=3.5 MG
C₂ = ?
Transcribed Image Text:Problem 1.12 (modified), Masters and Ela, Introduction to Environmental Engineering and Science, 3rd Ed.: The two-pond system shown in the figure below is fed by a stream with flow rate of 2.5 million gallons per day (MGD) and a BOD (a nonconservative pollutant) concentration 12 mg/L. The rate of decay of BOD is 0.43/day. The volume of the first pond is 6.5 million gallons (MG), and the second is 3.5 MG. Assuming complete mixing within each pond, find the BOD concentration leaving each pond. 12 mg/L 2.5 MGD V₁ = 6.5 MG C₁ = ? V₂=3.5 MG C₂ = ?
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