The BOD rate constant (k) for a river’s BOD assimilation was determined to be 2.0 day-1
(base
e). The BOD of this river after leaving a heavily populated town was determined to be 50 mg/L.
Determine the distance after which the river’s BOD would become 4 mg/L when the average velocity of
the river was 1 m/sec. What would have been the K value if this distance would have been 300 km
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