Environmental Impact of Cara Saray Wastewater Disposal on Water Quality of Tigris River in Mosul City/ Iraq

Abstract

The present study was conducted on discharged sewage water at Cara Saray disposition inTigris River. It is one of the main sewage water disposal in Mosul city. Samples were taken fromfour stations along the river which began at the discharge position. According to internationalstandard methods; physical, chemical and bacteriological properties were analyzed.It was found that the sewage water characterized by; diminution of dissolved oxygen and itdepleted within summer season, high content of organic load and ions of phosphate and sulfate.Also, significant increases in total count bacteria, total fecal coliforms bacteria and bacterium E.coli as indicator of pathogenic existences. The previous bacterial parameters were significantlyincreased of the 100m (third) station. Thus, the mild increments were continue till the last (300)mstation with values 11×106 cell /ml, 93×103 and 93×103 cell /100ml.