Second Midterm Fall 2009 (Test version b) ( 89 + 20= 109 /100)
Instructions: Students should occupy every other seat as instructed.
When the closed book portion is completed turn it in and get a copy of the open book portion. Pick up your book from
the floor in front then move to a new assigned seat at the back of the class.
Closed book portion. One page of notes one side allowed.
1. (3) (T/F) metal hydroxides are more soluble than metal sulfides.
2. (3)GAC stands for Granular___ Activated___
Carbon____
3. (3) On Figure 6-26, the relationship between the
concentration in the water and the air is governed
by _Henry’s Law____
4. (3) When examining environmental impact of
disposable coffee cups :
a) a paper coffee cup is more environmentally
conscious than Styrofoam
b) Styrofoam is more environmentally conscious than paper
c) careful analysis says it’s about a draw (even).
5. (3) Figure 6.29 talks about destruction of chlorinated organics using UV and _ozone__.
6. (3) The Kaya identity is related to:
a) equilibrium versus realized temperature
b) estimating carbon emissions from energy sources
c) equating latent heat released to amount of water condensed
d) rate of degradation of Papaya/Kaya fruits in a landfill study
7. (3) Composting is a term used to describe
a) land filling of yard wastes,
b) mixing of several waste streams into one prior to
treatment,
c) anaerobic degradation of organic materials under
controlled conditions yielding a marketable soil
amendment or mulch,
d) aerobic degradation of organic materials under
controlled conditions yielding a marketable soil
amendment or mulch.
8. (3) MSW stands for Municipal_ Solid_______
Waste______________
9. (6) Find the steady state solution for Equation 7.64 Answer: t->infinity means negative exponentials go to zero
and C(t) = (first term in equation is all that is left)
10. (3) Find the solution of Equation 7.64 at the starting time. Answer: time=0 means exponentials=1 and C(t) = C(0)
11. (4) If one is attempting to increase indoor concentrations of a new drug designed to improve worker
productivity, at steady state it can be done by increasing __source emissions___ or decreasing __ventilation
rate__ (see above equations and figure)
12. (3) Of the phases I, II, III, IV in this figure
they refer to what location/system?
_landfill_________,
13. (4) Which of the 4 phases from the figure
are anaerobic? (II, III, IV)
(4) This is the temperature difference between two locations on a meteorological Tower T = T110 m-T10 m from data taken
at the Brookhaven National Laboratory, New York, Circle where the atmosphere is stable. Answer: all locations where
dashed or solid lines are above the adiabatic (-1) temperature.
14.
15. (3) What is the primary source of the CO shown in this graph? ________________________
16. (3) Why is the concentration of CO higher at 1 AM than at 1 PM even though emissions are higher at 1 PM? ____
__stable atmosphere___________
17. (3) Is this a fumigation, coning, fanning, lofting, or looping plume? fanning
18. (3) Is the atmosphere at plume height, stable, unstable, or neutral? stable
19. (3) Circle where neutral stability occurs in the figure above. Answer: the 3 PM line is adiabatic
20. (3) Draw a hypothetical profile for 8 AM given what happened before then in the figure above. Answer: a z
shaped curve, adiabatic from ground to some height, inversion (sloped to right) up to adiabatic line, then follows
adiabatic line, see Figure 7.42 in text
21. (3) The cement industry produces about 5% of global man-made CO2 emissions. HOW? 40% from burning fuel
and the rest from _calcium carbonate goes to CaO___
22. (5) These represent benzene, dioxins and furans, label each of the 5 as either a) benzene, b) dioxins or furans.
Answer: the three on top are benzene
23. (3) Mark the location of highest water density on the depth/temperature chart. Answer: circle where the
temperature is 4C.
24. (3) Does the dissolved inorganic carbon move from the (stream to the air) or the (air to the stream) in the figure
above? Answer: stream to air
25. (3) Why doesn’t this cloud move? I watched it for 30 minutes and it didn’t move even though the wind was
blowing.
Answer: because cloud is formed when air rises to go over mountain
26. (6) Circle where the atmosphere is unstable.
Answer: any time/location where the slope is counterclockwise to adiabatic: 9, 10 am at low elevations, 12 PM
to about 1000 ft, 1 PM to about 500 ft, 2 PM to about 500 ft
8 am to about 100 ft and 11 am to about 1000 ft are probably adiabatic but too close to call so give credit here
either way
-1 point for any incorrect circle, -1 pt for any missing circle
Open Book
Textbook and one page of notes one side allowed.
1. (20) 40 g/s of oxides of nitrogen (NOx) are being emitted from the university power plant from an effective stack
height of 21 m at 6 AM on a typical El Paso summer morning just after sunrise, with a wind speed of 1.5 m/s.
Estimate the concentration 500 meters downwind of the stack and -75 meters off the plume centerline. Show
and justify all your work.
Please check my answer
Points: 7: get stability class (B is best but they could use A), sigma y, sigma z correct, note that a common error may be
to use the 75 meters on the graph to look up sigma y, should use the 500 meters on both graphs.
3: units correct
5: use the 75 meters correctly, note that since it is squared in the equation the (-) makes no difference
5: other parameters and answer correct