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?
Final lelvel of BOD is
a) we know that
solving for t
b) mass of microbes