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FGLiT=i{n;i{Jabatan Pengajian Po,liieknik

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DEPARTMENT OF POLYTECINIC EDL C.r, r lr-rl;(MINISTRY OF HIGHER EDL C {TI(-r\

CNIL ENGNEERING DEPARTMENT

FINAL EXAMINATIONDECEMBER 201O SESSION

C5305 : \\ ATER SUPPLY AND WASTEWATUR E\GI\EERI\G

DATE : 21 APRIL 2011 (THURSDAY)DURATION : 2 HOURS (8.30am - 110.30am)

This paper consists of FIVE (5) pages including the front paue.Structure / Essay ( 6 questions - answer 4. questions)

CONFIDENTIAtr, UNTIL 21,{PR]II, 2O1TDO NOT OPE]\ T][{IS QUESTION PAPER UNTIL INSTRUCTED B\' THE

CHIEF' II{VIGtrLATOR.

CONFIDENTIAL C530S: Water Supply And Wastewater Engineering

QUEST'rON 1

a) we can use water in many ways. state FI\rE (5) uses of water.

( 5 Marks )

b) Domestic water usage in Maraysia is the highest. List sIX (6) factors that

influence high dornestic water usage.

(6 Marks)

c) The lbllowing data was obtained frorn Taman seri Gemersik in 2000.

Calculate the volume of water demand (Wp) in 200g.

Total household : 1200 households

Average household members : 6 peoplt:

Per capita watgl cgnsllmption :200liters / person / day

Population growth :2.7% pel"year

Institutional water needs for : r I 3 of the population needs

Iligher education

Design Factor :2.5

NRW percentage :20%Water sLr pp ly covglggg_____J0%

, (P":Po(l *r)n, WDn:pnxQXIrl xF2+D, )

(14 Marks)

Page 2 of 5

CONFIDENTIAL

QUESTTOIT 2

a)

C5305: Water Supply And Wastewater Engineering

Raw water supply from various sources can

physical and biological characteristics. List

for w'ater,

be divided according its chemical,

FI'VE (5) chemical characteristics

(5 Marks)

ln order to have quality water supply, rav,/ water needs to go through watertreatment process. Explain the raw water treatment processes stated below:

c)

Aeration

Filtration

cpeggle&nPq5"1*--r

Besides rvater treatment process, additional water treatment

elirninate dissolved material contents in water. Explain

treatment as stated below:

,' Softening of water

)r Disinfecrion

QUESTiON 3

List Fr\lE (5) important componenrs in water distribution.

P

q

state FOLIR (4) functions of a water storage taLrk or a reservoir.

influence pipe leakage.

(12 Marks)

is also needed to

additional rvater

(4 Marks)

(4 Marks)

(5 rnarks)

(8 marks)

(12 marks)

Describe FouR t+l r@nar

Page 3 of 5

CONFIDENTIAI,

QUESTTOI{ 4

a) Explain the sewerage system listed below:

i. Cornbined Svstem

ii. Separated Systern

Water demand per capita

Householcl

Flow rate factor

Self-clean ing velocity

Manning coefficient, n

Circular sewer with gradient I :150

Assumption: fuil pipe flow

Based on the criteria above, calculate the

velocity is adequate or not.

C5305: Water Supply And Wastewater Engineering

(5 Marks)

(5 Marks)

:275 litrelcapitalday

: 6 person/unit

: 6 for population < 10,000 persons

:0.45 m/s

: 0.0r 4

sewer's diameter and check whether the

b)

c)

Damage that occurs inside concrete, iron, and steel of a sewer is caused bycorrosion. Explain the corrosion process that occurs inside the sewer.

(6 Marks)

RPT Desa Murni residential area consists of 12 rows of single storey

bungalows and each row contains 20 housing units. The following are some

design criteria for the sewerage system in that residential area.

(9 Marks)

Page 4 of 5

CONFIDENTIAL

QUESTTOT{ s

a)

c) Describe the procedures in

sourc,es such as houses, factori

C5305: Water Supply And Wastewater Engineering

rging effluent and sludge from various

ustries and agricurltural sectors.

(10 marks)

b)

Describe the follorving chemical properties of wastewater:

i. Protein

ii. pH

iii. Nitrogen

(9 marks)

state the TITREE (3) advantages of the wasteu'ater stabilization ponds.

(6 marks)

a)

b)

QUESTTOTT 6

With the help of a diagram, explain the workings

tanl<s:

i) Individual septic tanks

ii) Inrhoff Tank

List ltHFllEE (3) rnain functions of wastewater treatment. (6 marks)

Explain briefly standard A and Standard B for effluenr disposal in Malaysia.state the limitations of Biological oxygen Demand (BoDs) and Suspended

Solid (sS) for Standard A and B for wastewater designation purpose

(9 rnarks)

of the following sewage

(5 Marks )

(5 Marks )

c)

rage ) oI )

CONFIDENTIAL

QUESTTOI{ s

C5305: Water Supply And Wastewater Engineering

a) Describe the folloiving chemical properties of wastewater:

i. Protein

ll.

iii. Nitrogen

(9 marks)

State the TITREE (3) advantages of the wastewater stabilization ponds.

(l 0 niarks)

QUESTTO|T 6

List TIIRIEE (3) main functions of wastewarer treatment. (6 marks)

Explain briefly standard A and Standard B for effluent disposal in Malaysia.State the limitations of Biorogical oxygen Demand (BoDs) and Suspended

solid (SS) for Standard A and B for wastewaterdesignation purpose

(9 marks)

the workings of the following sewage

(5 Marks )

(5 Marks )

(6 marks)

Describe the procedures in d/hrardng effluent and sludge from various

sourc;es such as houses, factoriefilLustries ancl agricr-rltural sectors.

pH

b)

c)

a)

b)

c) With the help of a diagram, expiain

tanks:

i) Individual septic tanks

ii) Imhoff Tank

Page 5 of 5