Estimation of Organic Pollution of Odo Oba River (Osun State, Nigeria)

A study was carried out between mid June-August, 2010 to estimate the level of organic pollution of Odo Oba River in Osun and Oyo States. The parameters used to monitor the degree of pollution were Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD 5 ), Chemical Oxygen Demand (COD) and Permanganate Value (PV). 14 samples were collected along the water link, 200 m away from each other from the source to where the river discharges into Asejire River. The values of DO, BOD5, COD and PV ranges between 1.01-5.38, 04.2-24.2, 103-337 and 12-96 mg/L, respectively. The mean and standard deviation values were also (3.18 +/- 1.86), (15.35 +/- 6.59), (179 +/- 85) and (57.7 +/- 32.4) mg/L, respectively. The value of COD recorded from the analysis is greater than that of BOD 5 . This suggests that the river contains a high proportion of biologically non-degradable and inert matter as a constituent of gross organic pollution. From the results of the analysis, Odo Oba River is heavily polluted. The result of the analysis places Odo Oba River water quality in class V of the Classical Prati Water Quality Index Scale.