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
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
SPOILER ALERT: ANSWERS BELOW! FOR BEST RESULTS, DO THE
PROBLEMS FIRST USING JUST THE FORMULA SHEET, THEN LOOK AT
THE ANSWERS!
ANSWERS TO PRACTICE PROBLEMS EXAM 2
Problem 1:
Concentrations from practice problems for exam 1: (use these as your concentration
RISK
Dose =
(conc entration) ( IR )(absorption efficiency)
(average body weight of exposed individual)
where, IR ingestion or inhalation
rate
Risk=( Dose ) (SF )
(time o f exposure)
(lifetime length)
Hazard Quotient =HQ=
Average daily dose
RfD
Acceptable
ENVE 300
Spring 2015
Additional Practice Problems for Exam #2
NOTES:
1. A draft formula sheet was posted. Please let me know if you would like additional equations
added or give me feedback on improving the equation sheet. Please do this by Tuesday May
26
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
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 +
ENGR 300
Introduction to Environmental
Engineering
Lecture 9.2 & 10.2
Solid and Hazardous Waste
Dr. Michael Ryan
Objective
Solid waste (SW) system
Hazardous waste (HW)
Sources
Regulations
Collection
Treatment & disposal
Dene/characterize hazardous wa
ENGR 300
Introduction to Environmental
Engineering
Lecture 4.1
Energy Resources
Dr. Michael Ryan
Objectives for Today
Identify and classify different types of energy resources
Describe energy uses
Describe the environmental impact of energy resource ex
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
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
Water Treatment
Objectives
Characteristics of raw water
Conventional WTP
Unit processes
Key design variables
Hardness Removal
Characteristics of raw water
Characteristics of raw water
Characteristics of raw water
Objectives
Conventional WTP
Conventional W
Water Quality
Objectives
Oxygen Demand
DO sag curve
Surface Water Quality
Oxygen Demand
River Water Quality
Focus on management of dissolved oxygen (DO)
Relates discharge of oxygendemanding waste to water quality
Oxygendemanding material (organic and in
Water Chemistry
Objectives
Chemical Processes
Equilibrium vs. Kinetics
Equilibrium
Kinetics
Carbonate System
Adsorption, Absorption, and Sorption
Chemical Processes
Important chemical processes that govern chemical behavior in
engineered and natural syste