Given an aerated lagoon with a depth of 9.4 meters receives wastes containing 15 mg/L of biologically degradable material (Q = 8
640 m3/d). At steady state conditions, the first order reaction rate constant is 0.08 day-1 and the effluent concentration cannot exceed 11 mg/L. If you assume the lagoon is completely mixed and evaporation/seepage are negligible, what is the surface areas of the lagoon in acres?
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Answer:
135 hour
Explanation:
It is given that a carburizing heat treatment of 15 hour will raise the carbon concentration by 0.35 wt% at a point of 2 mm from the surface.
We have to find the time necessary to achieve the same concentration at a 6 mm position.
we know that where x is distance and t is time .As the temperature is constant so D will be also constant
So
then we have given
and we have to find
putting all these value in equation
so