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

The present study was conducted on discharged sewage water at Cara Saray disposition in Tigris River. It is one of the main sewage water disposal in Mosul city. Samples were taken from four stations along the river which began at the discharge position. According to international standard methods; physical, chemical and bacteriological properties were analyzed. It was found that the sewage water characterized by; diminution of dissolved oxygen and it depleted 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 significantly increased of the 100m (third) station. Thus, the mild increments were continue till the last (300)m station with values 11106 cell /ml, 93103 and 93103 cell /100ml.