Abstract
Abstract The study focused on evaluating the Wady Al-Danfely wastewater effluent, which is discharged directly in Tigris river. This effluent represents a mixture of industrial and domestic wastewater, that collected the large portion of the wastewater from industrial district at left bank of river and some residential quarters. The results revealed the exceeded of the total suspended solid concentration, BOD and COD of the stream effluent in compliance with the Iraqi standard for conservation of water resources, as its average concentrations were 104 mg/l, 54mg/l and 114mg/l respectively. According to organic load, the stream effluent is classified as weak. As compared with Municipal wastewater for last previous years, Wady Danfilly wastewater impurities were with less concentration levels; These impurities compares with Tigris river water quality increased by different percentage from the river quality and some exceeds by (41) time up to these of the river. However, the river water is remained within the Iraqi standards for conservation of water resources for the downstream after discharge points of the effluent; except the BOD that it reached in its average concentration to 13mg/l.
