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A well-mixed aeration lagoon (60 m long x 5 m wide x 2 m deep) received...

A well-mixed aeration lagoon (60 m long x 5 m wide x 2 m deep) received 400 m3 /d of wastewater with a BOD5 = 300 mg/L. Given a yield coefficient of 0.8 mg VSS/mg BOD5, endogenous decay rate constant = 0.08/day, maximum specific growth rate = 1.1/day, and half-velocity constant = 70 mg BOD5/L,

answer the following:

a. What is the hydraulic residence time?

b. What is the BOD5 removal efficiency of the aeration lagoon?

c. How much oxygen per day must the atmosphere supply to the pond?

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