A small lake with volume 20.0*10^3 m^3 has no natural pollutant sources. However, a sewage pipe discharges sewage containing a pollutant into the lake. Conditions in the sewage pipe are Qs=0.5m^3/s and Cs=100.0mg/L. The polutant is destroyed in the lake with a first-order rate constant of 0.20/day. THe flow rate out of the lake in 5.0 m^3/s. Assume that the lake is well-mixed. a) Calculate the steady-state pollutant concentration in the lake. b) What is the retentiont time for this lake?
A small lake with volume 20.0*10^3 m^3 has no natural pollutant sources. However, a sewage pipe discharges sewage containing a pollutant into the lake. Conditions in the sewage pipe are Qs=0.5m^3/s and Cs=100.0mg/L. The polutant is destroyed in the lake with a first-order rate constant of 0.20/day. THe flow rate out of the lake in 5.0 m^3/s. Assume that the lake is well-mixed. a) Calculate the steady-state pollutant concentration in the lake. b) What is the retentiont time for this lake?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A small lake with volume 20.0*10^3 m^3 has no natural pollutant sources. However, a sewage pipe discharges sewage containing a pollutant into the lake. Conditions in the sewage pipe are Qs=0.5m^3/s and Cs=100.0mg/L. The polutant is destroyed in the lake with a first-order rate constant of 0.20/day. THe flow rate out of the lake in 5.0 m^3/s. Assume that the lake is well-mixed.
a) Calculate the steady-state pollutant concentration in the lake.
b) What is the retentiont time for this lake?
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