Assessing The Water Quality At Shatt Al-Hillah/ Iraq, Using The Biological Oxygen Requirement BOD5

Abstract

Biological oxygen requirement (BOD₅) is of irreplaceable importance as a comprehensive indicator for assessing water quality. This study focuses on studying seasonal changes in biochemical oxygen demand and the relationships with water quality in the Shatt al-Hilla, Five sites along the river were chosen to collect seasonal samples. The results of this research showed the BOD₅ values ranged between (1.49 mg/L) as the lowest value in winter 2019 in the (ST1) site and the highest value (4.78 mg/L) in summer 2019 and in (ST4) site were due to domestic sewage and industrial waste. The current study's biochemical oxygen demand (BOD₅) results were relatively high when compared to previous studies on Shatt Hillah. However, they remain within standard limits and do not exceed the permissible international limits (WHO).