Adnan A. Al-Samawi; Sataa A.Al-Bayati; Ayat H. Al-Obaidi
Abstract
Alum represents the most coagulant used for water treatment .It is used due toits low cost and efficiency. However, there are many disadvantages, mainly someeffects due to aluminum ...
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Alum represents the most coagulant used for water treatment .It is used due toits low cost and efficiency. However, there are many disadvantages, mainly someeffects due to aluminum accumulation with time in human mind causingAlzheimer,s disease.In this work, Samples of water were collected and tested for residual aluminumconcentration as a fieldwork investigation in the distribution system of BaghdadCity. Samples of raw water were also taken from the intake of water treatmentplants located along Tigris River in Baghdad (Al-Karkh, East Tigris, Al-Karama,Al-Wathba, Al-Dora, Al-Wahda and Al-Rasheed ), then samples of tap water weretaken from some regions which the project supply and comparing it with the Iraqistandards. Samples collection were continued for four months (February, April,May, July) –2004 . The results indicated that aluminum concentrations decreasedwith increasing distance from water treatment plants due to the precipitation ofaluminum hydroxides on pipes wall, results had showed that most samples werewithin standards except Al-Rasheed water treatment plant which showed that 70%of samples exceeded the health limit (0.1 mg/L) and 30% of samples exceeded theaesthetic limits (0.2 mg/L) at the beginning of the water treatment plant .While inother water treatment plants percents were as follows: 35% of the samples exceededhealth limits and did not exceeded the aesthetic limit in Al-Karkh water treatmentplant ,45% of samples exceeded the health limit and 10% of samples exceeded theaesthetic limit in East Tigris water treatment plant, 33% of samples exceeded thehealth limit and in other points there were no samples exceeded the aesthetic limitin Al-Karama water treatment plant .Percent of samples which exceeded the healthlimit was 35% and there were no samples exceeded aesthetic limit in Al-Wathbawater treatment plant .While that in Al-Dora and Al-Wahda water treatment plantsshows that no samples out of the range for both health and aesthetic limits
