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Abstract
The objective of this research was to determine whether polymer use in conjunction with alum in Iraqi water treatment plants can be justified economically. A field scale pilot plant of 1000 m3/day was utilized. Test runs for alum alone and for polymer at low doses of 1 mg/1 and less with alum at different sequences of addition were conducted on various turbidity levels of Tigris River. The cost of chemicals per 1000 m3 pretreated water by alum alone and by alum with polymer that produced about the same efficiency of turbidity removal were determined. The results showed a reduction in chemicals cost from 40 to 85 percent for the various turbidity levels of Tigris River from 50–3285 ntu. Besides, a reduction in chemicals cost up to 85 percent was obtained when the hydraulic loading rate in the sedimentation basin was increased from 21.22 to 26.1 m/day. The research concluded that polymer use with alum can be economical in Iraqi water treatment plants.