HOMEWORK I (DUE ON Feb 08)
1.
H
2
S is vented from a stack which has an effective height of 50 m.
The wind
speed is 2.5 m/s on an overcast night.
For an emission rate of 0.06 g/s,
determine the maximum groundlevel concentration on the plume center line
downwind from the stack.
If the odor threshold for H
2
S is 0.00047 ppm, plot
the region which an average person could detect H
2
S by smell.
(10%)
2.
A groundlevel source (H = 0) is emitting pollutants at an unknown rate.
At
1 km directly downwind of the source, the measured groundlevel concentration
of the pollutant is 10
μ
g/m
3
.
The stability category is A.
Estimate the emission
rate of this source.
(5%)
3.
A power plant is emitting its stack gas from a 50m high stack.
For its
conditions, the plume rise is given by
where us is the wind speed in m/s.
The stability category is C.
At what speed
will the maximum calculated groundlevel concentration occur?
Hint: This
requires a trialanderror solution.
(10%)
4.
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 Spring '11
 Staff
 1 km, 5 kg, 5 km, effective stack height, groundlevel concentration

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