Improvement of the Capacity of Drinking Water Treatment Plant in East Quantara (Case Study) Dr. Eng....

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


• 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


• 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

Considered Plant



• The plant consists of the following main systems :1. Intake and Raw Water Pump Station :

Considered Plant


2. Distribution Shaft & Flash Mixing :

Considered Plant


3. Settling Tanks :

Considered Plant


4. Filter House :

Considered Plant


5. Treated Water Ground Reservoir :

Considered Plant


6. Chemical House

7. Sludge Pump Station

Considered Plant


8. Treated Water Pump Station :

Considered Plant

Considered Plant


PlantLayout

Considered Plant


GoogleEarth

Treatment Stages


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


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



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)



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



2. Clarifiers :– Installing tube settlers in the end of each tank

Tube Settlers


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

Tube Settlers




2. Clarifiers :– Installing new pipeline from the clarifiers to the filters



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

--------------------------------------------------------------------------------------------

After all the previous improvements,

the plant productivity increases from 80,000 to 140 m3/day

Economical Analysis


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


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


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


• 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%

THANK YOU


Improvement of the Capacity of Drinking Water Treatment Plant in East Quantara (Case Study) Dr. Eng....

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