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Design Of Nablus-West WWTP. An- Najah University Civil Engineering Department Graduation Project #2. Content. Background Objectives Population Analysis Wastewater Generation Stormwater and Infiltration SewerCAD Analyses Waste water treatment plant design
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Design Of Nablus-West WWTP An-Najah University Civil Engineering Department Graduation Project #2
Content • Background • Objectives • Population Analysis • Wastewater Generation • Stormwater and Infiltration • SewerCAD Analyses • Waste water treatment plant design • Results and Recommendations
Background • Location Nablus district is located in the northern part of the West Bank. Nablus
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
Background • Precipitation The annual mean rainfall is 664 mm • Humidity The mean annual relative humidity of Nablus district is 62% R H
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
Objectives • These goals should be established by achieving the following objectives of the project: • Design of wastewater conveyance system • Design of wastewater treatment plant
Study Area Dersharaf Zawata Beitebba Qosin Nablus West Beitwazan East
Water Consumption 42.40 m3/year ≈ 120 L/day
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
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)
SewerCAD Analyses • Using manning equation in hydraulic analysis • Manning coefficient = 0.013 • Velocity range: 0.5 - 4.5 m/s • All pipes are circular and made of concrete. All diameters are 1.4 m
SewerCADAnalyses Profile section
Design of wastewater treatment plant • Primary • Screening • Grit Removal • Primary sedimentation • secondary • Aeration • Secondary sedimentation • Advanced • Disinfection
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
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
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% .
Aeration • Is used to receive the flow from many entrance to prevent the excess concentration of bacteria in one location.
Secondary sedimentation Tank (Biological Process) • The objective of biological treatment is to reduce BOD to be with the standard, using bacteria
Disinfection • The process designed to kill or inactivate most microorganisms in wastewater, including essentially all pathogenic (disease-causing) organisms
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.
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.
