CEE 350 Winter 2012 Homework #2 Solution
Problem 1 (Textbook Problem 1.14, 0.6 points) Ozone is sometimes used as a disinfectant in drinking water. Ozone is highly reactive. It will react with many benign species as well as pathogens it is intended to kil
CEE 350 Homework Solutions, Week 1
Each problem is credited with 0.5 points. 1. (Textbook, #1.2) Suppose the exhaust gas from an automobile contains 1.0% per volume of carbon monoxide. Express this concentration in mg/m3 at 25C and 1 Atm. First, we will d
CEE 350 Homework #4
Problem 1 (Textbook Problem 2.35, 0.3 points) What values of a and b would complete each of the following (X and Y are not meat to be any particular elements) 266 a 88 X bY
a 15
X
32 b
Y
This can be written as
266 88
X
4 2
262 86
Y
32
CEE 350 Week 7 Homework Solutions
Problem 1 (Textbook 5.47) A confined aquifer 30.0 m thick has been pumped from a fully penetrating well at a steady rate of 5000 m3/day for a long time. Drawdown at the observation well 15 m from the pumped well is 3.0 m,
CEE 350 Week 6 Homework Solutions
Problem 1 (textbook 5.35) An often used chemical representation of algae is C106H263O110N16P. (a) Determine the mass (mg) of each element in 1 g of algae. First calculate the molar weight of algae molar wt = (10612)+(2631
CEE 350 Homework #3
Problem 1 (Textbook Problem 2.22, 0.5 points) One-half gram of solid calcium sulfate, CaSO4(s) is added to 1 L of pure water. Immediately, the solid begins to dissolve according to the following reaction: CaSO4 Ca 2
2 SO4
What is the c
CEE 350 Homework 5 Solutions
Problem 1 (textbook 4.5) Suppose a 70-kg individual drinking 2 L/day of water containing 0.1 mg/L of 1,1-dichloroethylene for 20 years. a. Find the hazard coefficient for this exposure b. Find the cancer risk c. If the individ
CEE 350 Week 8 Homework Solutions
Problem 1 (Textbook 6.6) Horizontal shaft paddle wheels are used in a tapered flocculation basin comprised of three compartments. The power input to the paddles progressively decreases through the basin with the first com
CEE 481 Autumn 2008, Midterm #1 Solutions
1. To start, we can choose an arbitrary flow rate through Pipe A. To make things easy, I chose
1 m3/s. The friction slope and headloss in that pipe are therefore given by the following
equations, where Q is in m3/
CEE 481 Aut 2008, HW#6 Solutions
1 (#2-1). The data are converted to rainfall intensities by dividing the amount of precipitation by
the storm duration, and those intensities are then plotted, as shown below.
12
Intensity (in/hr)
10
8
100 yr
6
25 yr
50 yr
CEE 481, Aut 2008, HW#5 Solution
1. The new average flow rate entering the development is 0.60 mgd, and the new peak, design
rate is 1.80 mgd. When the incremental flow is routed through the rest of the system, the pipe
sizes for the original flows are ad
CEE 481, Aut 2008, HW#3 Solutions
1. The same total water demand must be met regardless of how long the pumps operate, so if
they operate only 12 hours per day, the (constant) average supply rate during that period has
to be twice what it is if they opera
CEE 481, Aut 2008, HW#4 Solution
1. (Problem 6-4) (a,b) The system is set up in Water Gems with the given structural
information. The resulting flows and velocities in the pipes, and the pressures at the nodes,
are summarized in the following table. Note
CEE 481, Aut 2008, HW#1 Solutions
1. My error. Sorry.
2. A schematic of the system defining various geometric parameters is shown below.
L
w1
2 ft
0.1 in
We can write Bernoullis equation between the water surface and the gap. Noting that the
pressure at b
CEE 481, Aut 2008, HW#2 Solutions
1. The relationship between headloss and pipe diameter can be obtained using Flow Master
by inputting the fixed information that the pipe is 10 km long and the flow rate is fixed at
1.5 m3/s. Also, the roughness height is
CEE 481 Aut 2008 Final Exam Solutions
1. Infiltration refers to water that enters sewer pipes through cracks in joints, holes generated
by corrosion, or other processes that occur underground. Inflow refers to water that enters
through openings at the gro
Class CEE 350 Quiz #4
A groundwater contains 80 mg/L Ca2+ and 45 mg/L Mg2+. Find the total hardness expressed in mg/L as CaCO3. The atomic weights of calcium and magnesium are 40 and 24.3 g/mol, respectively. The concentrations of Ca2+ and Mg2+ expressed
Class CEE 350 Quiz #3
What is the difference between phreatic and confined aquifers? A phreatic aquifer is the same as an unconfined aquifer. That is, groundwater movement in the subsurface zone is limited by only underlying with low or nonexistent hydrau
Class CEE 350 Pop-up quiz #2 Name _ Determine the concentration of dissolved oxygen (in mg/L as O2) in water in equilibrium with oxygen in the air at 25C. The partial pressure of oxygen is 0.21 Atm, and the Henry constant KH of oxygen at this temperature
Class CEE 350
Pop-up quiz #1 solution
The molar concentration of urea (NH2)2CO in human urine is about 0.15 mol/L. Assuming that the average daily excretion rate is about 2 L/day, determine the weight of daily excreted urea. Atomic weights of nitrogen, hy
CLASS 350 PRACTICE MIDTERM EXAM
Problem 1 The protonation constant of acetic acid CH3COOH is 4.8. Determine the contributions of the anionic and neutral forms of this compound at pH 3.8, 4.8. 5.8. Formulas to determine the speciation of a monoprotic acid
CLASS 350 FINAL PRACTICE EXAM
Problem 1 Define the following abbreviations AQI DNAPL LNAPL NAAQS MCL Air Quality Index Dense Non-Aqueous Phase Liquid Light Non-Aqueous Phase Liquid National Ambient Air Quality Standards Maximum Contaminant Level
Problem 2
CLASS 350 MIDTERM SOLUTIONS
Problem 1 (0.4 point) A lagoon is to be designed to accommodate an input flow of 0.20 m3/s of a non-conservative pollutant with concentration 45.0 mg/L and reaction rate 0.25/day. The effluent from the lagoon must have pollutan
CEE 350 Homework Week 9 Solution
Problem 1 (0.8 point) A single-pass membrane system is used to desalinate seawater containing 27,000 mg/L of sodium chloride. The concentration of sodium chloride in the permeate is 82 mg/L. The feed flow rate is 1105 m3/d
CEE 481 Midterm Exam 1b, Aut 2008
Name: _
Show all your work. If you can answer a question by inspection of the data, write a
sentence stating your reasoning. A NUMERICAL ANSWER WITHOUT ANY
EXPLANATION WILL RECEIVE NO CREDIT.
All data are given in metric