The Project
Al Sherqat water treatment plant is a mega water treatment plant located in the east bank of Al Sherqat city northern of Baghdad; the project key features are:
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Total capacity : 88,000 M³/day
Piping work: DIP Pipes= 45,600m of 600mm.
Pumping stations are consisting of treatment plant pumping as below:
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Treatment plant stations pumping to Elevated storage tank 1 @ 33,000 m³/day
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Treatment plant stations pumping to Elevated storage tank 2 @ 22,000 m³/day
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Treatment plant stations pumping to Booster station @ 33,000 m³/day
One booster station capacity of 22,000 m³/day.
Ground storage tanks:
Ground storage tank capacity of 10,000 M³
Ground storage tank capacity of 3,000 M³
Technology:
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The source of water for the treatment plant is the TIGIRS River. 5-Nos. of low lift pumps each of capacity 1400-m3/hr and 25 mwc head draw water from the river through an intake structure and deliver the same to the Water Treatment plant through 2-Nos. pumping mains each of size 800 mm. The length of each main is approximately 300 m. Low Lift pumps are located in the Low Lift Pump House.
Raw water from each pumping main is received in a single flash mix tank. One (1)-No. Flash mixer is considered for installation in this tank. The flash Mix tank is designed for a retention time of approximately 1 minute. Tank volume is 66 m3. Alum Solution is to be added up in the flash mix tank to facilitate mixing with the incoming turbid raw water.
The raw water entering the flash mixer is also chlorinated through a Vacuum type Chlorinator for the purpose of pre-chlorination. 4-Nos. of chlorinators of capacity 10 kg/hr (each) are provided. The alum dosed and pre-chlorinated water enters the next unit into the Clariflocculator.
There are in total 4-Nos. Clariflocculators considered for this project. The raw water leaving the flash mixer will feed all 4 Clariflocculators. Each Clariflocculator is of 38-m diameter x 4-m (swd) side wall depth with the flocculation compartment of 14-m dia.
The settled water from each Clariflocculator is routed by gravity to a control chamber of 300 m3 capacity.
The underflow from each of Clariflocculator is routed through a telescopic sludge discharge system into a common sludge pit of 400 m3 holding capacity, from where it either gravitates to the river or is pumped back into the river depending on the hydraulics between the river and sludge pit. 3-Nos. sludge pumps are provided for the purpose.
The clarified water from the control chamber gravitates to the filter inlet channel. There are 2-Nos. filter feed mains each of 800-mm size feeding each bank of filters. There are totally 20 filters arranged in 2 banks. The total flow to each filter is 200 m3/hr.
The area of each filter bed is 40 m2. The size of each filter bed is 5m x 8m. The filtration velocity is 5m/hr.
Filtered water shall be routed to the Ground Filtered Water Storage Tank via two filtered water mains, each of size 800 mmf.
Two (2) Nos. Ground Filtered Water Storage Tanks (GFWST) is proposed for this project. The first GFWST shall be located within the Battery limits of the treatment plant and shall mainly hold filtered water arriving from the Filter Gallery. The second GFWST is located within the battery limits of the Boosting Station and will hold water arriving from the High Lift pump house of the Treatment Plant, before being distributed further. Each GFWST consists of a receiving well and a suction well. The receiving well shall receive filtered water directly from the Filter gallery as in the case of the Treatment plant or pumped filtered water through a pumping main as in the case of a Boosting Station. The suction well shall provide suction to the high lift pumps located in the High Lift Pump house of the Treatment plant as well as Boosting Station.
At the end of each filter cycle the filter bed is air scoured pneumatically to dislodge entrapped solids and subsequently back washed using filtered water to fluidize the filter bed and remove suspended solids entrapped within the pores of the filter media during the filtration cycle. Air blowers and wash water pumps have been provided for this purpose.
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Suction for wash water pumps shall be drawn from the GFWST. Wash Water pumps will be housed in the high lift pump house along with the other high lift pumps.
Filtered water collected and stored in the GFWST will be pumped to various locations. These locations include pumping filtered potable water to the Elevated Storage Tank (EST) or the GFWST at a Boosting Station or directly to a village.
The suction well of the GFWST in the treatment plant provides suction to the following high lift pumps (12 nos.) located in the adjacent High Lift Pump House.
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From treatment plant to Elevated storage tank No. one (4,540 m3) capacity located at the same site @ 3 Nos. pumps.
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From treatment plant to Elevated storage tank No. two (2,270 m3) capacity located at AL-EATHA village. @ 3 Nos. pumps.
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From treatment plant to GFWST at the Boosting Station @ 3 Nos. pumps.
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3-Nos. wash water Pumps (2w+1sb) each of capacity 600 m3/hr and head 25 mwc.
Filtered water collected and stored in the GFWST of the Boosting Station will be pumped to various locations. These locations include pumping filtered potable water to the Elevated Storage Tank (EST) or directly to a village.
The suction well of the GFWST in the Boosting Station provides suction to the following high lift pumps (5 nos.) located in the adjacent High Lift Pump House.
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From GFWST to KHANOOKA village @ 2 Nos. pumps to network by hydro fore system
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From GFWST to AL-BADEAYA Complex @ 3 Nos. pumps to network by hydro fore system.
