Answer to Question #214265 in Civil and Environmental Engineering for lethabo shilubane

Question #214265

A perfectly mixed aeration pond with no recycle (return line) serves as the biological reactor for a small community. The pond receives 30 m3/d of influent with a BOD5 of 350 mg/L that must be reduced to 20 mg/L before discharge. It has been found that the kinetics constant for the system are Ks = 100 mg/L BOD5, kd = 0.10 d-1, um = 1.6 d-1, and Y is 0.60 mg BOD5.

A)What must the hydraulic detention time be in the aeration pond?

B) What mass of microbes will be produced in the pond each day?

Expert's answer

Given data:

Final lelvel of BOD is

a) we know that

solving for t

b) mass of microbes

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