Homework Assignment 1
Chapter One
1)
The molecular weights of N, H2S, and NaHCO3 are 14, 34.1, and 84 respectively.
a) 4.2 ppm, 4200 ppb, 3.00e-4 M, and 3.00e-4 m
b) 12 ppb, 12e-3 ppm, 3.52e-7 M, and 3.52e-7 m
c) 114 ppm, 114e3 ppb, 1.36e-3 M, and 1.36e-3
Homework #2 Solutions
1. The equation for the reaction is:
H 2 O( l ) H 2 O( g )
G (kcal/mole):
-56.69
-54.64
For the overall reaction, G = 2.05 (kcal/mole)
2. The equation for the reaction is:
CH 3COOH H + + CH 3COO
For the overall reaction, G = 6.51 (
Homework #3 Solutions
Chapter 5
8. A specific ion electrode contains a solution that is reactive with a specific ion or
group of ions. The solution is in contact with a membrane that transmits the potential
of the target species in the solution. The poten
Homework #4 Solutions
Chapter 4
17. Use equation 4.9 in the book to calculate v (mg/L/h) for substrate concentrations
ranging from 0 to 500 mg/L. Then plot v on y-axis vs. [S] on x-axis.
For the second part of the problem again use equation 4.9, but remem
Homework #5 Solutions
1. Mixing in the vertical and lateral directions would not negate plug flow. The contents
in a plane remain in it and do not mix with adjacent planes. Vertical and lateral
mixing cause uniform conditions to be maintained in the plane
Homework 6
1. 6.5 mm wide bars, spacing 5.0 cm; C = 0.84; upstream velocity: 0.4-0.9 m/s
hL =
(
1
v s2 v 2
2
2 gC
)
(eq.11.2)
Determine area available for flow Af = lwf, total area is A = lw; Af/A = 0.87
The design condition assumes that the area is half
Homework Solutions #7
Chapter 13: Coagulation Flocculation
1. Colloids are charged entities and they derive their stability from their charge. More
highly charged ions are more strongly attracted to colloids and neutralize them,
allowing them to agglomera
Homework Solutions #8
Chapter 14
1. a) The equations for volume and surface area of a sphere are:
Vs =
d 3
6
As = d 2
Calculate the volume occupied by particles in 1m3 to be 0.60m3. Then calculate the
number of spheres, now from those two things caculate
Homework Solutions #9
1.
Remember CaCO3 has 2 eq/mole. The calcium hardness is 120 mg/L as CaCO3, and
total hardness is 202.8 mg/L as CaCO3.
3.
To get Ksp calculate the meq of Ca2+ and CO32- for 0.6 meq/L of CaCO3. Ksp = 3.6e-7
(meq basis) or 9.0e-8 (mola
Lecture 1
CE260
Water Quality
Regulation Driven
Clean Water Act
Safe Drinking Water Act (SDWA)
RCRA
CERCLA
Risk and Numeric Criteria
Primary - enforceable
Secondary - nonenforceable
Health and Synthetic Criteria
Receiving Water and Receptor Issues Con
Solubility product
AaBb(s) aAb+ + bBa- dissolution
C
K so =
A
cfw_ Ab + a cfw_B a b
cfw_ Aa Bb ( s )
Bb ( s ) goes to 1 due to activity of a solid
Must exercise cation
For example if CO3 solids are present must consider (may alter solubility)
Open or cl
Lecture 4
Ce260/Spring 2000
Analysis and Constituents in H2O
Standard methods for the examination of water and wastewater
EPA methods
Methods of Analysis
Titration volume of titrant and concentration of titrant are important
e.g. 0.02 N H2SO4 used to t