A small lake with volume 10,000 m3has a stream flowing into it with flowrate 100 m3/dayand a Toluene concentration of 1.0mg/m3. A factory discharges 5 m3/day into the lake withToluene concentration of 10 mg/m3 -they want to increase effluent to 50mg/m3. Toluenedecays at a rate of 0.01 day-1.Assume steady-state and completelymixed (CSTR).a) How would this increase indischarge concentration change thelake concentration?Answer: 0.73 mg/m3 before, 1.71 mg/m3 afterb) Field studies show that the samelake would be better represented bydividing the lakeinto two cells. The first cell having avolume of 2,500m3 and the secondwith 7,500m3.How does this affect the estimate ofconcentration leaving the lake?Compare with one-cell model.Assume the factory continues todischarge at 10 mg/m3 into the firstcell.

a) The increase in discharge concentration would lead to an increase in the overall concentration of…

Answered: A small lake with olume m3 has a stream…

A small lake with olume m3 has a stream flowing into it with flow rate 100 m3/day and a Toluene concentration of 1.0 mg/m3. A factory discharges 5 m3/

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Pressure and Stress

Question

A small lake with volume 10,000 m3
has a stream flowing into it with flow
rate 100 m3/day
and a Toluene concentration of 1.0
mg/m3. A factory discharges 5 m3/
day into the lake with
Toluene concentration of 10 mg/m3 -
they want to increase effluent to 50
mg/m3. Toluene
decays at a rate of 0.01 day-1.
Assume steady-state and completely
mixed (CSTR).
a) How would this increase in
discharge concentration change the
lake concentration?
Answer: 0.73 mg/m3 before, 1.71 mg/
m3 after
b) Field studies show that the same
lake would be better represented by
dividing the lake
into two cells. The first cell having a
volume of 2,500m3 and the second
with 7,500m3.
How does this affect the estimate of
concentration leaving the lake?
Compare with one-
cell model.
Assume the factory continues to
discharge at 10 mg/m3 into the first
cell.

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