Assignment 2 Solution
Problem 1
Using your backpack as a control volume,
a) Monitor all of the inputs and outputs for Wednesday, Thursday, and Friday.
b) Monitor all transformations or reactions (Did your banana rot? Did Tupperware grow
mold? Did you spil
Name:_
NOTE REGARDING FORMULA SHEETS:
FORMULA SHEETS MUST HAVE YOUR NAME ON THEM
FORMULA SHEETS MAY HAVE FORMULAS ONLY
NO EXAMPLES OR DEFINITIONS
IF YOUR FORMULA SHEET INCLUDES EXAMPLES OR DEFINITIONS, YOU WILL GET A ZERO
ON THE EXAM
FORMULA SHEETS MUST
Problem 1
Inputs and outputs for Wednesday, Thursday, and Friday:
Day
Wednesda
Input(s)
package, chips, filler
y
paper
Thursday
goggles, Biology
Friday
Overall
binder, Environmental
Output(s)
Transformation(s)
bottle
mass of chips
chips, package, bottle

For this assignment, various definitions of sustainability and sustainable development provided
by various organizations have been analyzed. The problem stated to comment on the similarities
and differences between the different definitions.
Brundtland Co
Problem 1
An ideal example of a completely mixed reactor (CMR) would be when the
conditions are completely uniform throughout the process. This occurs when the
composition of the effluent is equal to the composition of the system.
The controlled volume, f
MATH 215/255
Fall 2014
Assignment 3 solutions
1.6, 1.7, 2.1, 2.2
Solutions to selected exercises can be found in [Lebl], starting from page 303.
1.6.6: Start with the logistic equation dx
x). Suppose that we modify our
dt = kx(M
harvesting. That is we wi
MATH 215/255
Fall 2014
Assignment 2
1.4, Exact equations ([Brauns Section 1.9]), 1.6
Solutions to selected exercises can be found in [Lebl], starting from page 303.
1.4.8: Solve
x2
1
y 0 + xy = 3 with y(0) = 0.
+1
Answer.
We rewrite the equation as y 0 +
Assignment 3 Solution
Problem 1
Think of a physical system that you could model as a completely mixed reactor (ie uniform in
concentration throughout). Describe the system and your justification for classifying it as
completely mixed. Now explain any devi
Problem 1.1. Define and comment on the similarities and differences between the different
definitions.
(a) Sustainable development: According to the Bruntland Commission, sustainable
development is defined as development which meets the needs of the prese
Fall 2012 Exam I Practice Problems
Phenol can be oxidized by a variety of compounds. Assume it has a first order decay
rate of 0.12/hr. You have a plug flow and a complete mix tank that each have a 8
hour mean residence time for the volume of flow you nee
ENVE300Fall2015PracticeProblems
1. Assume a wastewater treatment plant operates with a flow rate of 12,000 m3/day.
Determine the detention time observed in the field for two circular settling tanks with
depth 3.5 m that were designed to have an overflow r
Nooraldean Aldabdoub
ENVE 300
Assignment 6
Question 1: List three factors that alters the publics perception of risk.
1) Dread
2) Familiarity
3) People affected
Question 2 (Problem 6.2): Identify several types of risk during your commute to school. Which
Assignment 3 Solution
Problem 1
Think of a physical system that you could model as a completely mixed reactor (ie uniform in
concentration throughout). Describe the system and your justification for classifying it as
completely mixed. Now explain any devi
Assignment 2 Solution
Problem 1
Using your backpack, purse, dorm room, (etc. choose something no larger than a room, and be
sure to identify what you choose) as a control volume,
a) Monitor all of the inputs and outputs for 3 consecutive days.
b) Monitor
Assignment 4 Solution
Problem 1
Problem 4.11
A wet scrubbing system has three separate inlet streams (Figure 4.27). The mass flow rates in
these inlet streams are 100 lbm/min, 58 lbm/min, and 74 lbm/min. The water spray into the
scrubber is 60 lbm/min and
Assignment 1 Solution
Problem 1
Read the syllabus. Pay particular attention to the policy regarding assignments and quizzes, and
make note of the exam dates. Also read through the handout for Class 1 provided with the Class
1 lecture. No submission is req
Assignment 5 Solution
Problem 1
Problem 4.3
4.3 Consider a house into which radon is emitted through cracks in the basement. The total
volume of the house is 650 m3 (assume that the volume is well mixed throughout). The radon
source emits 250 pCi/s (A pic
ENVE 300 . N a m e .
Spring 2013
Exam 2
May 24, 2013 "
Answer all of the following problems. Show your work. Good luck!
1) Suppose Philadelphias water supply has 2x10'3 mg/L of polychlorinated biphenyls (PCBs) in it. The
slope factor for PCB is 7.7 kgd
ENGR 300
Introduction to Environmental
Engineering
Lecture 3.2
Air Pollution II
Dr. Michael Ryan
Announcement
HW 5 due Monday 18th
Midterm Exam 1 Wednesday 20th
Point will be deducted for
picture submission
illegible scans
Incorrect allignment
4/13/
Sustainable Development
Week 1.2: Introduction to Sustainability
DEFINITIONS OF
SUSTAINABILITY AND
SUSTAINABLE DEVELOPMENT
1
Sustainable Development
Definitions of Sustainability
From Assignment 1, you already know these definitions:
The Brundtland Comm
WaterResources
andWaterPollutants
Objectives
Watershed
Water Sources
Urban Water Cycle
Pollution
ENVE 300 Environmental Engineering  Drexel University  Dr. M. Ryan
Watershed land area that
drains to a point of concern
Drainage due to gravity
Runoff or i
Problem 1:
An 800m3 lake receives on average 400 m3/year in runoff from an adjacent neighborhood,
with a nitrate concentration of 1.5 mg/L in the runoff. The volume of the lake remains
constant, with 400 m3/year exiting the lake downstream. Assume a fi
l
I ENVE 300 PUT YOUR NAME ON THE BACK OF THE EXAM
Spring 2015
Exam #1
There are 5 problems on 5 pages. You may use a calculator and the formula sheets provided. Good luck!
Problem 1 (20 points!
v Q
A 1,000m3 lake receives on average 400 m3/year in runoff
ENVE300IntroductiontoEnvironmentalEngineering
HomeworkAssignment#6Solutions
Problem 1
NOx is emitted from a 85m high stack at a rate of 75 g/s. Calculate the ground level concentration of NOx 90 m
125 and
49 and
from the centerline. The plume rises 25 m
Assignment 5 Solution
Problem 1
A 1.0 x 106 gallon reactor is used in a water reclamation plant. The influent concentration is 100
mg/L, the effluent concentration is 25 mg/L, and the flow rate through the reactor is 500 gal/min.
(a) What is the firstor
Spring 2015 Practice Problems OPTIONAL
I suggest you close your book, print the formula sheet, and solve these problems using just the formula
sheet. If you can solve them without any help besides the formula sheet, youre probably ready for the
exam. Answ
EQUATIONS
Mass balance general equation (mass = m)
dm
= m mout m reaction
dt
Energy balance general equation (energy = E)
dE
= E Eout
dt
Heat loss and energy demand equations
Heat loss through building skin=
1
At
R
1/R = flow of Btu through a 1 square f