Environmental Engineering Reference
In-Depth Information
Problem 9.3
A vehicle traveling along a highway at 90 km/h emits 80 g CO and 10 g NO per liter of fuel burned.
The vehicle travels 8 km per liter of fuel burned. Calculate the emission rate of CO and NO in units
of g/km and g/mi. Compare the latter with the U.S. federal vehicle emission standards for model
year 1994.
Problem 9.4
Table P9.4 shows ozone concentrations measured every hour on the hour on a high pollution day in
Los Angeles. Plot the diurnal ozone profile. Determine the arithmetic average and geometric mean
ozone concentrations for that day. Determine the maximum 8-h arithmetic average concentration
and compare it with the proposed U.S. ambient O
3
standard of 80 ppbV.
t ( ) 123456789 0 1 2
O
3
(ppbV) 12
8446 0 3 2 3 8 2 3
t (h)
13
14
15
16
17
18
19
20
21 22 23
24
O
3
(ppbV) 212 254 302 312 315 312 204 162 88 34 23
18
Problem 9.5
A coal-fired power plant has a smoke stack 30 m high and3mindiameter. The flue gas exit velocity
is 5 m/s, the exit temperature is 300
◦
C, the ambient temperature is 30
◦
C, the wind speed is 3 m/s,
and the atmospheric stability category is B. Calculate the effective height above ground level (m)
of the plume center line using the Briggs plume rise equation.
Problem 9.6
Using the calculated emission rate of the plant with characteristics given in Problem 9.1, the
Gaussian Plume Equation, stability category B, and the effective plume height calculated in Problem
9.5, calculate the SO
2
concentration (
gm
−
3
) at a downwind distance of 1 km, 100 m perpendicular
to the wind direction at the top of a 100 m high hill.
µ
Problem 9.7
For the same power plant, using Figure 9.3, estimate the highest concentration of SO
2
(
gm
−
3
)
on level ground for stability category B. Estimate the downwind distance (m) at which the highest
concentration (
x
max
) would occur.
µ
Problem 9.8
A highway with 8 lanes has traffic of one vehicle per 30 m per lane. Each vehicle emits on the
average 10 g/s CO at an average height of 2 m. The wind speed is 6 m/s, wind direction at an angle
