Kingdom of Saudi Arabia
Ministry of Higher Education
Majmaah University
College of Engineering
Civil Engineering Department
Exam Information
Final Exam
Course code:
CE 362
Course Title:
Water Supply and
Sewage Engineering
Instructor:
Section number:
Zia ur Rehman
510
Exam date:
Exam time:
Number of pages:
From:
10
31/12/2013
28/02/1435 H
12:00 Noon
40 points
9:00 am
To:
Total score:
Student’s Information
Name:
ID:
Exam Instructions:
 Read the questions carefully and several times. Writing clearly will make
it possible to assess your answers correctly.
 Any form of cheating, intention to cheating, or disruption of the exam will
subject you to a disciplinary action as specified by the university’s
regulations.
 Carrying or using the mobile phone during the exam is not allowed. Using
the phone during the exam will carry a disciplinary action.
 The calculator is only permitted by the exam supervisor.
 No student can leave the exam room during the first half hour of the
exam. Any student coming after the first half hour of the exam will not be
permitted to enter the exam.
 A student leaving the exam, even for legitimate reasons, may not be given
a makeup exam.
Points Earned:
Question
Score
1 (5)
4 (4)
7(4)
10(4)
Question
2 (4)
5(4)
8 (3)
Score
Question
3 (4)
6 (4)
9 (4)
Score
Total score of the exam:
Dear student, we encourage you to answer the exam the best you can and we
wish you all success.
1
Question 1: Fill in the blanks:
(i)
(0.5x10=5)
Temperature is the most important parameter it affects the
…………………… and chemical reactions in the water system.
(ii)
Pure water is colorless, but water in nature is often by foreign
substances. True color due to………………………………………after removing
suspended solids.
(iii)
…………………. is a measure of the ability of water to neutralize
acids.
(iv)
Conversion of organic matter into CH4 and CO2 in ……………………….
treatment process takes place.
(v)
Grit chamber is used to remove the inorganic settable particles
such as …………….., …………….. and ……….……….of the waste water.
(vi)
………………………..are those organisms capable of infecting or of
transmitting disease to Human
(vii)
Physical parameter defines those characteristics of water that
respond to the sense of ………………………,
……………………….. , taste or
smell.
(viii)
Hardness
is
defined
as
the
total
concentration
……………………………… and ……………………………. ions.
of
(ix)
Taste and Odor mainly due to …………………. , biological activity
and industrial pollution.
(x)
The dilution factor P is ………………………………… for BOD 300mg/l
waste water sample having DOi = 7.9 and DOf = 4.8 mg/l?
2
Question 2: Calculate the influent concentration of BOD and S.S., efficiency X, Y
and the net efficiency of the treatment plat under following conditions:
(4)
Primary
Treatment
Raw Sewage
BOD ?
S.S. ?
BOD = 245
S.S. = 3510
Secondary
Treatment
BOD = 30 mg/l
S.S. = 450 mg/l
ȠBOD = X
ȠBOD= 2X
ȠSS = 2Y
ȠSS=Y
3
Question 3: Draw the process flow sheet of conventional waste-water treatment
plant.
(4)
4
Question 4:
examples each.
Write the types of Secondary treatment processes with 2
(4)
5
Question 5: (a)
What are operational parameter for primary treatment
process in w/w treatment plant?
(2)
1
2
3
4
Question 5: (b) Define
(i)
COD
(ii)
Water Distribution System
Question 6: (a) Define:
(i)
Types of Sewers
1.
(2x1=2)
(2x1=2)
2.
3.
(iii)
Grey water
6
Question 6: (b) Fill in the blank
(2x1=2)
S.No.
Sample volume in
300 ml BOD bottle
D.O. initial (mg/l)
D.O. final (mg/l)
Calculated BOD
(mg/l)
1.
5 (ml)
?
6.9
138
2.
3 (ml)
8.9
5.1
?
Question 7: (a) Define:
(i)
Plant layout and Siting:
(ii)
BOD:
(2x1)
7
Question 7 (b):
With 2 examples.
Explain the aerobic process in waste water treatment plant.
(2)
Question 8: Write factors affecting the per capita demand of water?
(3)
8
Question 9: Write basic design consideration in design of sewers?
(4)
9
Question 10: Under following conditions:
(i)
Total population of Al Madina Al Munawwara City 500 000
(ii)
Water demand 90 liter per day per capita including all losses.
(iii)
80% of the water supply converted into the waste water
(iv) 6750 m3/day consume in kitchen and gardening.
(v)
2250 m3/day losses in evaporation and leakages.
Calculate
1. Total water quantity in m3/day
2. Total waste water quantity generated in m3/day
3. Percentage quantity of water consumed in one day
4. Percentage quantity of water in losses in one day
(4)
Answer:
10