improvement of the capacity of drinking water treatment plant in east quantara (case study) dr. eng....
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Improvement of the Capacity of Drinking Water Treatment Plant
in East Quantara (Case Study)
Dr. Eng. Ibrahim Khaled El-SayedChairman
1North & South Sinai Company for Water & Wastewater
North & South Sinai Company for Water and Wastewater( NSSCWW )
Introduction
2North & South Sinai Company for Water & Wastewater
• The River Nile is Egypt’s main water resource and the country
enjoys a fixed share of the river flow
• But population increases and economic growth couples with
limited water resources
• Thus Egypt, like many other Arabic countries, is facing a problem of water scarcity
• So, we must control excessive usage and reduce losses of
potable water and optimize the utilization of treated
wastewater
Considered Plant
3North & South Sinai Company for Water & Wastewater
• The considered plant has been constructed in East Quantara
on the east side of Suez Canal to serve North Sinai, Egypt
• It started the actual production on 1996
• The required electrical power for the plant is supplied from
the local electrical power network
• The raw water is supplied from Nile River, Ismailia Canal on
the west side of the Suez Canal
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• The plant consists of the following main systems :1. Intake and Raw Water Pump Station :
Considered Plant
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2. Distribution Shaft & Flash Mixing :
Considered Plant
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5. Treated Water Ground Reservoir :
Considered Plant
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6. Chemical House
7. Sludge Pump Station
Considered Plant
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8. Treated Water Pump Station :
Considered Plant
Treatment Stages
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1. Pre-Chlorination :
– Dosage dose of the chlorine in the form of chlorine water solution is
dosed according to the raw water quality
2. Coagulation - Flocculation :
– The solution of the aluminium sulphate is to be dosed into the raw
water according to its quality and the JAR test result. The solution is
dosed into the flash mixing shaft, fitted with a paddle stirrer
– Flocculation is realized on the mechanical principle with paddle stirrers
Treatment Stages
15North & South Sinai Company for Water & Wastewater
3. Longitudinal settling tanks
– This is the first separating stage
4. Gravitational quick filtration :
– This is the second separating stage
5. Post-Chlorination :
– The post-chlorination dose value shall be according to residual
chlorine content in filtered water
– The dosing point is into common outlet of filtered water
Capacity Improvement
17North & South Sinai Company for Water & Wastewater
1. Raw Water Intake & Pump Station :
– Maintenance of the intake and installing new screens
– Maintenance and washing of the outlet pipeline
– Installing new GRP outlet pipeline DN 1000 from the station to
the siphons with a length of 1.5 km
– Replacing the pumps with higher outlet flow rates pumps (from
330 lit/sec each to 550 lit/sec)
Capacity Improvement
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2. Clarifiers :
– Maintenance of the two inlet pipelines
– Maintenance of the sedimentation tanks
– Replacing the PVC perforated wall between the flocculation and
sedimentation tanks with a concrete wall
– Installing new electrically-drived valves for the sludge of the
sedimentation tank
Capacity Improvement
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2. Clarifiers :– Installing tube settlers in the end of each tank
Tube Settlers
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The tube settlers provide a series of inclined surfaces for suspended particles to rapidly collect and settle upon while the clarified effluent flows out of the tank and on to the next stage of the treatment process
When the collected particles become heavy enough, they fall from the tube modules and descend to the bottom of the clarifier
In addition to enhancing laminar flow conditions, the inclined surfaces of the tubes reduce the distance that particles need to travel before settling
This rapid settling effect maximizes the effective surface area for settling, thereby minimizing clarifier footprint
Capacity Improvement
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2. Clarifiers :– Installing new pipeline from the clarifiers to the filters
Capacity Improvement
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3. Filters :– Installing new fully automatic-controlled control panels with
PLCs
– Installing new central PLC with HMI to monitor all the filters
– Installing new electrically-driven valves for all filters
– Installing new flow meters and level meters
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After all the previous improvements,
the plant productivity increases from 80,000 to 140 m3/day
Economical Analysis
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1. Power Consumption Cost Power Consumption Cost = 0.17 LE/m3
2. Chemical Cost Chemical Cost = 0.055 LE/m3
3. Maintenance & Repairs Cost Maintenance Cost = 0.045 LE/m3
4. Labour & Administration Cost Labour Cost = 0.05 LE/m3
Economical Analysis
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5. Capital Cost
Capital Cost = 0.45 LE/m3
Without Tube Settlers
• Capital Cost = 300,000,000 LE
• Product = 100,000 m3/day
• Working Days = 330 days/year
• Expected Life Time = 20 years
Using Tube Settlers
• Capital Cost = 300,000,000 LE
• Tube Settlers = 6,000,000 LE
• Product = 140,000 m3/day
• Working Days = 330 days/year
• Expected Life Time = 20 years
Capital Cost = 0.33 LE/m3
Economical Analysis
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Total Cost per One Cubic Meter
Total Cost without Tube Settlers = 0.77 LE/m3 of treated water
Total Cost with Tube Settlers = 0.65 LE/m3 of treated water
By using Tube Settlers, the total cost decreased by 16%.
Conclusions
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• The following conclusions are obtained based on one year of
operation :
1. The plant is very sensitive to turbidity. Any increase of
turbidity requires more chemical treatment
2. The main design of the plant is suitable to be improved in
order to increase the plant final capacity
3. After using tube settlers, the total cost of one cubic meter of
treated water has been decreased by 16%