1. Design Of Nablus-West WWTP
An-Najah University 
Civil Engineering Department
Graduation Project #2
Design Of Nablus-West WWTP
Prepared by:
Supervised by:
Allam Aghbar
Islam Janem
Mohammad Kukhun
Dr. Abdel Fattah R. Hasan
23/05/2012

2. Content Background Objectives Population Analysis
Wastewater Generation
Stormwater and Infiltration
SewerCAD Analyses
Waste water treatment plant design
Results and Recommendations

3. Background
Location
Nablus district is located in the northern part of the West Bank.
Nablus

4. Background Topography
Nablus lies in a valley between two mountains, Ebal Mount and Gerzim Mount
Ebal Mount
Climate
Climate in Nablus is rainy in winter, hot and dry in summer
Gerzim Mount

5. Background Precipitation The annual mean rainfall is 664 mm Humidity
The mean annual relative humidity of Nablus district is 62%
R H

6. Objectives
The ultimate goal of this project is to enhance the sanitation sector in the Nablus city, that will lead to:
Prevention of disease and nuisance condition
Providing clean water supply for irrigation
Avoidance contamination of water supply

7. Objectives
These goals should be established by achieving the following objectives of the project:
Design of wastewater conveyance system
Design of wastewater treatment plant

8. Study Area Nablus Der sharaf Zawata Beit ebba Qosin West Beit wazan
East

9. Population Analysis
1997
2007
2012
Palestinian Central Bureau of Statistics
248,102
317,298
356,129
Constant growth rate method
358,818
Geometric growth rate method
358,490
Arithmetic method
352,943

10. Population Analysis 2007 2012 2042 West-Nablus 74,868 84,367 177,071
Zawata
1,855
2,129
4,387
Beit wazan
1,046
1,178
2,474
Beit ebba
3,116
3,497
7,370
Qosin
1,691
1,897
3,999
Der sharaf
2,434
2,731
5,757
Total
85,010
95,799
201,058

11. Water Consumption
m3/year
≈ 120 L/day

12. Wastewater Generation
Water consumption = 120 L/c.d
Design period = 30 year
Return flow = 80%
Hourly peak factor = 3
Infiltration = 10% of mean daily wastewater
Stormwater generate only from the old city

13. Stormwater Q storm = C × I × A = 3,042 L/s
C = 0.9 A = 27.6 ha I = 120 (L/s.ha)
Return period = 4 years Rainfall duration = 12 (min)

14. Wastewater Generation
Population 2042
Wastewater (L/s)
Infiltration (L/s)
Stormwater (L/s)
Total amount (L/s)
West-Nablus
74,868
590.2
19.7
3,024
3,634
Zawata
1,855
14.6
0.5 -
15.1
Beit wazan
1,046
8.3
0.3
8.5
Beit ebba
3,116
24.6
0.8
25.4
Qosin
1,691
13.3
0.4
13.8
Der sharaf
2,434
19.2
0.6
19.8
Study Area
201,058
670 22
3,717

15. The Main Trunk

16. SewerCAD Analyses Using manning equation in hydraulic analysis
Manning coefficient = 0.013
Velocity range: m/s
All pipes are circular and
made of concrete. All
diameters are 1.4 m

17. SewerCAD Analyses

18. SewerCAD Analyses

19. Velocity (Average) (m/s)
SewerCAD Analyses
Velocity (Average) (m/s)
Slope (m/m)
Invert (Stop) (m)
Stop Node
Invert (Start) (m)
Start Node
Label
4.03
0.01
421.46
MH-2
421.66
MH-1
CO-1
421.34
MH-3
421.44
CO-2
420.11
MH-4
421.11
CO-3
418.41
MH-5
419.01
CO-4
416.66
MH-6
417.16
CO-5
415.25
MH-7
415.95
CO-6
414.19
MH-8
414.79
CO-7
410.63
MH-9
411.38
CO-8
407.98
MH-10
408.58
CO-9
405.5
MH-11
406.1
CO-10
403.93
MH-12
404.38
CO-11

20. SewerCAD Analyses
Profile section

21. Design of wastewater treatment plant
Primary
Screening
Grit Removal
Primary sedimentation
secondary
Aeration
Secondary sedimentation
Advanced
Disinfection

22. Design of wastewater treatment plant

23. Depth in the conduit (m)
Screening
This is the first step in preliminary treatment process which aims to remove floating and suspended matter such as paper, cloth.
Quantity of screenings = 0.9 m3/day
Design criteria
Bar spacing (mm)
Depth in the conduit (m)
slope
Bar depth (mm)
Bar width (mm)
Velocity (m/s) 50
0.53
60° 35 10
0.6

24. Grit Removal Chamber
Grit chamber used to remove grit sand and other material manly to protect moving mechanical equipment and pumps from unnecessary wear and abrasion
No. of tube
Blower capacity
Detention time (min)
Length (m)
Total Depth (m)
Width( m ) 22
8.775 m3/min 4
19.5
3.5
4.5

25. Primary sedimentation tank
It removes 90% to 95% of settealble solid ,and remove 30% to 40% of BOD also reduce total suspended solid 50% to 70% .
No.
Width
(m)
Length
Total depth
Slope %
Weir length
Weir section 4 6 24
1.35 50
0.2 m

26. Aeration
Is used to receive the flow from many entrance to prevent the excess concentration of bacteria in one location.

27. Secondary sedimentation Tank (Biological Process)
The objective of biological treatment is to reduce BOD to be with the standard, using bacteria
Overflow rate (m3/m2.d)
Detention time (hr)
Weir loading (m3/m.d)
Flow rate (m3/d)
average liquid depth (m) 20 3
110
40,000
2.1
No.
Width (m)
Length (m)
Total depth (m)
Slope (%)
Weir length (m)
Weir section (m) 2 16 64 3
1.35
82.8
0.3

28. Disinfection
The process designed to kill or inactivate most microorganisms in wastewater, including essentially all pathogenic (disease-causing) organisms
Width (m)
Length (m)
Height (m)
1.6 64
4.8

29. Results and Recommendations
The main trunk can carry the wastewater without flooding .
In wastewater treatment plant design we followed a series of processes that helped to achieve the acceptable level of treated waste water.

30. Results and Recommendations
The outputs of treatment processes are treated water and sludge. The treated water can be used as an irrigation water in wadi al-zomar ,for olive, almonds, that will lead to reduce the amount of pure water consumption for irragation and the extract sludge can also be used as a fertilizers.

31. THANKS FOR LISTENING