The decay of chlorine in a water distribution system follows first-order decay with a rate constant...
The decay of chlorine in a water distribution system follows first-order decay with a rate constant of 0.4 d-1. If the concentration of chlorine in a well-mixed water storage tank is 2.0 mg/L at time zero, what will the concentration be at the end of two days? Assume no water flows out of the tank.
Homework Answers
Concentration of chlorine at any time is given by
where
C0 = initial concentration = 2 mg/L
k = decay constant = 0.4 per day
t = time in days = 2
Therefore
C = 2e-0.4×2
= 0.8986 mg/L
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