Evaluation of the efficiency of the northern project for the water purification and transport, in Al-Dour city, Salahaldin, Iraq

The study was conducted to evaluate the efficiency of the northern project for water purification and transport in Al-Dour City, based on the of physical tests and chemical analyses in addition to pollution Indicators Water Quality Index (WQI), and Heavy Metal Pollution Index (HPI). Water samples were collected from four sites: Tigris River water (Intakes), sedimentation basins, after passing through the filtration unit, and house water. Laboratory work included the physiochemical properties of water: EC, TDS, TH, Tur., Alk and pH. It also included chemical analyses for samples: Cations (Ca, Mg, Na, and K), Anions (SO₄, HCO₃, Cl, and NO₃) and Heavy Metals, such as: Fe, Co, Zn, Cu, Mn, Cd, and Pb. Accuracy of chemical analyses were calculated using the Ionic Balance Equation. The results of the analyses were compared with the limits and specifications proposed by the Iraqi standard (IQS), World Health Organization (WHO), and Canadian Specifications. The concentrations of the major Ions (Cations and Anions) were within the permissible limits, while the Heavy Metals were within the permissible limits except Iron and Cadmium. Water Quality Index (WQI), it was found that the water quality was not acceptable for drinking in River, and Filtrations basin, and was very poor in Sedimentation basin, and poor in Houses. Heavy Metal Pollution Index (HPI), was low in River and Sedimentation basin and medium in Filtrations basin and Houses. In general, the efficiency of the project was acceptable, but required chemical treatments to remove heavy metals, suspended contaminated sediments, and impurities in addition to the disposal of unacceptable turbidity.