The perfectly mixed aeration pond with no recycle (return line) above 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 kinetic constants for the system are Ks=100mg/L BOD5, kd=0.10 d—1 , μm = 1.6 d—1 , and Y is 0.60 mg VSS/mg BOD5. Note: In this system each day, the bacteria have to grow at the same rate as they leave in the effluent, in order for the bacteria population to stay at a steady state concentration. What must the hydraulic detention time be in the aeration pond? You should perform a mass balance on microbe mass to solve this question.
The question refers to a well-mixed aeration pond or aeration lagoon that can be modeled according to the diagram below. The pond is simply a body of water that holds the wastewater for some detention time before the waste degrades or leaves in the effluent stream. There is no recycle line. You should derive a mass balance on X to solve these problems, make sure to include all terms in the mass balance. You may assume no X flows in with the influent.
The perfectly mixed aeration pond with no recycle (return line) above 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 kinetic constants for the system are Ks=100mg/L BOD5, kd=0.10 d—1 , μm = 1.6 d—1 , and Y is 0.60 mg VSS/mg BOD5. Note: In this system each day, the bacteria have to grow at the same rate as they leave in the effluent, in order for the bacteria population to stay at a steady state concentration. What must the hydraulic detention time be in the aeration pond? You should perform a mass balance on microbe mass to solve this question.
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