Question

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?

Answer #1

A rectangular, well-mixed aeration lagoon is 75 m long, 5 m
wide, and 2 m deep. It receives 400 m3/d of wastewater
with a BOD5of 367mg BOD5/L for treatment. The
biodegradation rate constants for the wastewater are the following:
yield coefficient = 0.8 mg VSS/mg BOD5, endogenous decay
constant = 0.08 d-1, maximum specific microbial growth
rate = 1 d-1, and half velocity constant = 76.0 mg
BOD5/L.
What must the hydraulic detention time be in the aeration pond?
(days)...

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