8/10/2019 BAA3613 Enviroment Engineering Final Exam

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I]MVERSITI

MALAYSIA

PAHANG

FACULTY OF

CIVI ENGINEERING

&

EARTH

RESOIIRCES

INSTRUCTIONS

TO CANDIDATES

1.

Answer

ALL

questions.

2. All

answer to

a

new

question

should start on

a

new

page.

3.

All the calculation

and assumptions must

be

clearly shown

and stated.

4.

Answer ALL

questions

in TWO

(2)

decimal

points.

EXAMINATION

REOUIREMENTS

1. Periodic

Table

FINAL

EXAMINATION

COURSE

COT]RSE

CODE

LECTI]RER

DATE

DURATION

SESSION/SEMESTER

PROGRAM CODE

EI{WRONMENTAL

ENGINEERING

B4A3613

DR

NGIEN SU KONG

NADIAH BT

MOKIITAR

5

JANUARY

2015

3

HOURS

SESSION 2OI4I2OI5

SEMESTER

I

BAA

DO

NOT TURN THIS PAGE

TINTIL

YOU ARE

TOLD

TO DO

SO

This examination

paper

consists

of

MNE

(9) printed pages

including front

page

8/10/2019 BAA3613 Enviroment Engineering Final Exam

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CONFIDENTIAL

QIIESTION

1

BAA/1415V8AA3613

Water

samples were taken from the distribution

point

of

a water treatment

plant

in

Skudai, Johor and tested

to

determine the

quality

of

the treated water.

The

testing

proceeded

until

only

three

parameters

were

left

to

be

determined.

All

the

other

parameters

tested were

within

the acceptable limit stated in

the National

Standard for

Drinking Water

Quality

expected for

MPN,

TDS and Hardness. The maximum

acceptable value for the

three

parameters

still

to be determined

is shown in Table

Qla.

Table

Qla

:Parameter

Limit in National Standard

for Drinking

Water

Quality

Parameters Maximum

Acceptable Value

Total Coliform

Absent

in

100

mL

sample

Total Dissolved Solids 1000 mg/L

Total

Hardness 500

mg/L

The results for the solids determination are

as

follows:

150 mL of the water

sample

was filtered. The

weight of the filter

paper

before

filtering is

0.05

g.

After filtering and drying at 1030C,

the weight of the

filter

paper

is

0.0749. The

water

that

passed

through

the filter was

put

in a drying dish

and dried

at

1030C. The weight

of the drying dish alone

is

110

g.

The weight

of

the dish together

with

the residue

after drying is 110.336

g.

Calculate the

Total

Dissolved Solids in the water.

(4

Marks)

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CONFIDENTIAL

QUESTTON

2

If daily water

demand at the end

of

2040

is

heavy industry

(22,000

Llha.day)

and light

service factor,

F

0.5,

determine:

)/.Vopulation

groMh

rate,

r

K

Population

in

year

zo4o

BAA/1415I/BAA3613

estimated to

be 300l/person.day,

industry

(45,000

Lha.day),

with..,r

Water

distribution

depending on

the topography

of the distribution

areas.

With

suitable

illustration,

sketch and describe

'gravity

and

pumped

combinations'

system in water distribution work.

(3

Marks)

b) Bentong is estimated to become

a new

satellite city in

2040.

A budget has been

allocated for heavy industrial area

(40

ha)

and

light

industrial

area (80

ha)

development.

Existing data

taken from

Jabatan Perangkaan shows the

following

population

data in Table

Q2a:

Table

Q2a:

Population

data

for

Bentong town

Year

Population

(person)

1

980

35, 000

20t0

60,

300

qF

+

iii. Total

average daily water

demand for 2040 (I\4LD)

\

c)

The overflow

rate

for

sptlilrg

cglumn is

given

as 500l/m2.hr.

velocity is 1.5mm/s,

will the floc

settle?

Veriff

the answer.

4***,

If the

floc

settling

(5

Marks)

d)

Differentiate

the

function of residual

chlorine

and

chlorine demand

in

chlorination

process.

Define

breakpoint chlorination

(5

Marks)

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CONFIDENTIAL

,6

The

results for the ionic content of the

water are

as

follows:

Ca2*

:70

mglL

OH-

:

50

mgll-

Mg'*

=

45 mglL

Coz2-:120 mglL

Na*

:

8

mgll

SO

a2-

:29.28 mglL

Compute

the Total Hardness

in the water.

(12

Marks)

The results

for the multiple tube

fermentation tests

are as shown

in Table

Qlb.

Estimate

the

MPN/100 mL.

Table

Qlb

: Total Coliform Analysis

Size of

Portion

(mL)

10

I 0.1 0.01

0.001

Positive

Tubes

2

I

0

4

0

Negative Tubes

a

J

4

5

I 5

(5

Marks)

Based

on Table

Qla

and

the results in

part

(a)

to

(c),

judge

whether the water

from the water treatment

plant

is

fit for drinking.

(4

Marks)

BAA/141sy8AA3613

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CONFIDENTIAL

BAA/1415I/8AA3613

e) In types

2

sedimentation,

the flocculating

particles

are continuously changing

in

size,

and

shape.

Therefore, a settling

column is used to determine

the removal

efficiency of

the column and

the

sedimentation

column

analysis

result obtained

is shown

in Table

Q2b

below.

From the

data:

i. Plot isoremoval lines

ii. Construct vertical

line

at

detention

time, t--40min

iii.

Determine

the

removal efficiency

(7

Marks)

Table

Q2b:

Analysis

of sedimentation

column

for

180

minutes

Depth

(m)

Time of

sampling,

min

10

20 40

60

90 t20

Percentage

removal

(%oR)

0.6

50

60

67

72

73 76

t.2

33

45

s8 62

70 74

1.8 31

38 54

59

63 7l

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CONFIDENTIAL

QUESTTON

3

BAA/1415I/8AA3613

,{

Discuss THREE

(3)

methods that

can

be

used in sludge disposal.

,

'

\-e\A$

\jN'^

Design

a

waste stabilization

pond

system that

treats 20 MLD of wastewater

at a

temperature

@

The system should

contain all three types of

ponds.

other

information for the design

is

given

in Table

Q3.

(6

Marks)

(19

Marks)

Table

Q3:

Information for Waste Stabilization

Pond

17500000

FC/100

mL

Depth

of FacultativePond

,/

Maturation Pond Retention

Time,

t-