Title: Pollution assessment of the impact of industrial effluents on the qualities of surface water and sediments of River Ona in Ibadan, Oyo state, Nigeria

Authors: Olubunmi Ayoola Nubi, Afolasade T. Nubi

Addresses: Nigerian Institute for Oceanography and Marine Research, P.M.B.12729, Victoria Island, Lagos, Nigeria. ' Environmental Laboratories Limited, P.O. Box 15104, Ikeja, Lagos State, Nigeria

Abstract: River Ona, a major river in Ibadan, into which industries discharge their effluents, was studied to assess the impact of the industrial discharge. The mean levels for some parameters gave evidence of pollution. The mean values for DO (4.9 ± 0.3 mg/l), COD (54.5 ± 0.5 mg/l), PO₄³⁻ (0.47 ± 0.09 mg/l), SO₄²⁻ (20.65 ± 0.85 mg/l) were reported for the upstream region, while the downstream mean values for same parameters gave 3.72 ± 0.37 mg/l, 211.20 ± 59.6 mg/l, 1.06 ± 0.20 mg/l and 23.62 ± 3.20 mg/l, respectively. The effluent was also analysed, and the results obtained confirmed that the effluent was not the only source of pollutants in the river.

Keywords: industrial effluents; water pollution; environmental impact; anthropogenic; effluent discharge; river pollution; surface water; sediments; Nigeria.

DOI: 10.1504/WRSTSD.2010.032746

World Review of Science, Technology and Sustainable Development, 2010 Vol.7 No.4, pp.379 - 386

Published online: 18 Apr 2010 *

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