A well-mixed aeration pond with no recycle serves as the biological reactor for a small community. The pond receives 30 m³/d of influent with a BOD5 of 375 mg/L that must be reduced to 28 mg/L before discharge. The kinetic constants for this system are the following: Ks = 100 mg/L BOD5, kd = 0.10/d, Hmax = 1.6/d and Y = 0.60 mg VSS/mg BOD5. When answering the following, assume that steady-state conditions apply. a) What must the hydraulic residence time be in the pond to achieve the desired level of removal? 4 d b) What is the mass of microbes produced in the pond each day? kg VSS/d
A well-mixed aeration pond with no recycle serves as the biological reactor for a small community. The pond receives 30 m³/d of influent with a BOD5 of 375 mg/L that must be reduced to 28 mg/L before discharge. The kinetic constants for this system are the following: Ks = 100 mg/L BOD5, kd = 0.10/d, Hmax = 1.6/d and Y = 0.60 mg VSS/mg BOD5. When answering the following, assume that steady-state conditions apply. a) What must the hydraulic residence time be in the pond to achieve the desired level of removal? 4 d b) What is the mass of microbes produced in the pond each day? kg VSS/d
Chapter14: Chromatography
Section: Chapter Questions
Problem 9P
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Transcribed Image Text:A well-mixed aeration pond with no recycle serves as the biological reactor for a small community. The pond
receives 30 m³/d of influent with a BOD5 of 375 mg/L that must be reduced to 28 mg/L before discharge. The
kinetic constants for this system are the following: Ks = 100 mg/L BOD5, kd = 0.10/d, Hmax = 1.6/d and Y = 0.60 mg
VSS/mg BOD5.
When answering the following, assume that steady-state conditions apply.
a)
What must the hydraulic residence time be in the pond to achieve the desired level of removal? 4
d
b)
What is the mass of microbes produced in the pond each day?
kg VSS/d
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