CV6504
Hazardous Waste Treatment and Recovery
Homework 3
Plating waste stream containing 0.1% (w/w) dissolved nickel. The flow rate of waste stream is
3
80 m /d. Nickel is removed from a plating waste stream by hydroxide precipitation. It forms a
solid hy
CV6504
Hazardous Waste Treatment and Recovery
Homework 2
1.
You are working as a consultant to help a Chemical Company to determine the waste
sludge containing heavy metals. Sketch a diagram to illustrate the procedure of the
EPA TCLP standard method for
CV6504
Hazardous Waste Treatment and Recovery
Homework 4
Plating waste stream containing 0.05% (w/w) dissolved nickel and 2.5 % (wt) of suspended
solid. The flow rate of waste stream is 20 tonnes per day. Continuous hydroxide precipitation
and filtration
CV6504
Hazardous Waste Treatment and Recovery
Exercise only
1.
Calculate the empirical formulae of the following compounds from their percentage
composition by weight:
1.
2.
3.
4.
K, 56.5%; C, 8.70%; O, 34.8%
H, 12.5%; N, 87.5%
Mg, 9.8%; S, 13.0%; O,26.0%
42
PART 1 Completely Mixed Systems
EXAMPLE 2.5. EVALUATION OF TEMPERATURE DEPENDENCY OF RE-
ACTIONS. A laboratory provides you with the following results for a reaction:
4°C
16°C
k1 = 0.12 ct"1
k2 = 0.20 (1"
T1
T2
(a) Evaluate 6 for this reaction.
(b) Det
LECTURE 4 Particular Solutions 83
BOX 4.2. Donald O'Connor and Closed-Form Solutions
You may be wondering why in this age of computers Ive devoted this lecture (and
several other parts of this book) to analytical or closedform solutions. In fact prior to
62 PART I Completely Mixed Systems
As in Example 3.4 there is a certain amount of subjectivity involved in deciding
how much of the recovery is judged as being enough. In general Irecommend using
either 190 or 195. They are neither too lenient nor too str
LECTURE 6 reeooacr: bysrerns OI Keacrors 11 I
PROBLEMS
6.1. Three matrices are dened as
2 6
[x]: 3 10] owl? [Z]=[:
7 4
6.2.
6.3.
6.4.
Perform all possible multiplications that can be computed between pairs of these ma-
trices.
In 1970 the total phospho
LECTURE 5 Feedforward Systems of Reactors 99
to omitting B from the analysis. The graph shows that results for C are quite close
for the two cases, indicating that for all intents and purposes we would be justied
in omitting B.
PROBLEMS
5.1. A spill of 5
NANYANG TECHNOLOGICAL UNIVERSITY
SCHOOL OF CIVIL AND ENVIRONMENTAL ENGINEERING
CV6602 URBAN HYDROLOGY
TUTORIAL QUESTIONS ON
BASIC METEROLOGY & RAINFALL
1.
Anemometers at 5 and 60 m on a tower record wind speeds of 5.0 and 10.0 m/s
respectively. Compute wi
NANYANG TECHNOLOGICAL UNIVERSITY
SCHOOL OF CIVIL AND ENVIRONMENTAL ENGINEERING
CV6602 URBAN HYDROLOGY
TUTORIAL QUESTIONS ON
HYDROGRAPH ANALYSIS AND RAINFALL ABSTRACTIONS
1.
Plot the following flow data on a semi-logarithmic paper, and determine the
recess
NANYANG TECHNOLOGICAL UNIVERSITY
SCHOOL OF CIVIL AND ENVIRONMENTAL ENGINEERING
CV6602 URBAN HYDROLOGY
TUTORIAL QUESTIONS ON URBAN DRAINAGE
1.
An area of 8 ha has an overland flow length of 50 m and an overland slope of
0.05. The area has a runoff coeffici
NANYANG TECHNOLOGICAL UNIVERSITY
SCHOOL OF CIVIL AND ENVIRONMENTAL ENGINEERING
CV6602 URBAN HYDROLOGY
TUTORIAL QUESTIONS ON CHANNEL ROUTING
1.
Given the hydrographs tabulated below (cubic meters per second), find the 12hourly storage values for the reach
NANYANG TECHNOLOGICAL UNIVERSITY
SCHOOL OF CIVIL AND ENVIRONMENTAL ENGINEERING
CV6602 URBAN HYDROLOGY
TUTORIAL QUESTIONS ON HYDROGRAPH SYNTHESIS
Given below are the observed flows in m3/s from a storm of 3-hr duration on a
stream with a drainage area of 2
NANYANG TECHNOLOGICAL UNIVERSITY
SCHOOL OF CIVIL AND ENVIRONMENTAL ENGINEERING
CV6602 URBAN HYDROLOGY
TUTORIAL QUESTIONS ON
FLOOD FREQUENCY ANALYSIS
1.
The maximum discharges as recorded at a river gauging station between 1940
and 1950 are as follows:
Dat
ENCE 215 Practice Water Chemistry Problems:
5. The following ions are present in solution. What is the concentration of Cl-?
Ion
Na+
C lMg+2
SO4-2
Ca+2
K+
g/L
10.8
?
1.3
2.7
0.8
0.4
M
0.47
?
0.0535
0.0281
0.02
0.0102
Answer: 0.93 M
6. Which form of chlori
ENCE 215 Practice Water Chemistry Problems:
1. What is the pH of a pure 0.05 M HOCl solution? (HOCl is a weak electrolyte with Ka
= 10-7.5.)
Answer: 4.4 V
2. A solution contains 0.1 M total free chlorine and has a pH of 7. What are the
concentrations of t
ENCE 215 Practice Redox Problems:
1. Assign oxidation numbers to each element in the following compounds:
a. H2CO3
b. N2
c. Zn(OH)4-2
2. Identify the species being oxidized and those being reduced, and identify the oxidizing
agents and reducing agents:
a.
ENCE 215 Practice Redox Problem Solutions:
1. Assign oxidation numbers to each element in the following compounds:
a. H2CO3
H: +1, C: +4, O: -2
b. N2
N: 0
c. Zn(OH)4-2
Zn: +2, O: -2, H: +1
2. Identify the species being oxidized and those being reduced, an
ENCE 215 Practice Cell Potential Problems:
1. In an electrochemical cell with zinc, the net chemical reaction is:
Zn(s) + 2 H+ Zn+2 + H2(g)
At, 25oC, what is the cell potential?
H2(g) has a partial pressure of 1 atm, and the concentrations of Zn+2 ions an
ENCE 215 Practice Cell Potential Problems:
3. What is the minimum voltage needed to split salt water? The reaction of salt water
splitting is:
Cl-(aq) + H2O(l) OH- + 0.5 H2(g) + 0.5 Cl2
Experimental conditions include 1 M Cl- concentration, 10-7 M OH- con
ENCE 215 Practice Cell Potential Problems:
1. In an electrochemical cell with zinc, the net chemical reaction is:
Zn(s) + 2 H+ Zn+2 + H2(g)
At, 25oC, what is the cell potential?
H2(g) has a partial pressure of 1 atm, and the concentrations of Zn+2 ions an
ENCE 215 Practice Cell Potential Problems:
3. What is the minimum voltage needed to split salt water? The reaction of salt water
splitting is:
Cl-(aq) + H2O(l) OH- + 0.5 H2(g) + 0.5 Cl2
Experimental conditions include 1 M Cl- concentration, 10-7 M OH- con
ENCE 215 Practice Water Purification Problems:
1. 500 L of wastewater at 25oC has the following concentrations:
60 mg/L of NaCl and 2 g-COD/m3
a) What is the minimum energy requirement to remove the salt and COD from the
wastewater? (Assume molar mass of
ENCE 215 Practice Heat Transfer Problems:
1. A rectangular house, LxWxH = 20 m x 10 m x 3 m, has 1 2m x 5m window in each of
the 4 walls. The heat resistances (i.e. insulating ability) of the walls, roof, and windows
are 0.12, 0.2, and 0.01 m2K/W respecti
ENCE 215 Practice Fuels & Thermodynamics Problems:
1. a) How many pounds of coal are required to make electricity for an electric car to
travel 100 miles if 1 pound of coal contains 5000 kJ and the car can travel 2.5 miles per
kWh of electricity?
Answer:
ENCE 215 Practice Hydro Power Problem:
1. What is the energy efficiency of a dam (LxWxH = 1000 ft x 900 ft x 200 ft) that
produces 1.5 x 1012 J of energy?
Answer: 50 %
Nuclear Energy Practice Problems:
1. How much nuclear energy is produced from 500 g of
ENCE 215 Practice Population Growth Problems:
1. The initial population of a region with unrestricted growth is 2.5 million. What is the
population in 50 years if the doubling time is 45 years?
Answer: 5.4 million
2. The available area (or biocapacity) of