Problem 1- A 80,000 m³ well-mixed pond receives 300 m³/day of influent containing a contaminant "A" in a concentration of 300 mg/L. The pond operates in a steady state condition and discharges into a nearby river. Contaminant "A" decays biologically according to first-order kinectics. The reaction rate constant (decay coefficient) is 0.40 d1. Assume that no other losses or gains occurs in the pond (e.g., evaporation, seepage, or rainfall) and that the pond is completely mixed. a) Draw a complete mass balance diagram and show the control volume. b) What is the pond's retention time? c) Find the steady-state concentration of Contaminant "A" in the pond effluent that is discharged into the river.
Problem 1- A 80,000 m³ well-mixed pond receives 300 m³/day of influent containing a contaminant "A" in a concentration of 300 mg/L. The pond operates in a steady state condition and discharges into a nearby river. Contaminant "A" decays biologically according to first-order kinectics. The reaction rate constant (decay coefficient) is 0.40 d1. Assume that no other losses or gains occurs in the pond (e.g., evaporation, seepage, or rainfall) and that the pond is completely mixed. a) Draw a complete mass balance diagram and show the control volume. b) What is the pond's retention time? c) Find the steady-state concentration of Contaminant "A" in the pond effluent that is discharged into the river.
Chapter2: Loads On Structures
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Transcribed Image Text:Problem 1 - A 80,000 m³ well-mixed pond receives 300 m /day of influent containing a
contaminant “A" in a concentration of 300 mg/L. The pond operates in a steady state
condition and discharges into a nearby river. Contaminant “A" decays biologically
according to first-order kinectics. The reaction rate constant (decay coefficient) is
0.40 d1. Assume that no other losses or gains occurs in the pond (e.g., evaporation,
seepage, or rainfall) and that the pond is completely mixed.
a) Draw a complete mass balance diagram and show the control volume.
b) What is the pond's retention time?
c) Find the steady-state concentration of Contaminant "A" in the pond effluent that
is discharged into the river.
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