Analysis of pollution status of River Illo,Ota, Nigeria |
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Authors: | E O Longe D O Omole |
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Institution: | (1) Department of Civil and Environmental Engineering, University of Lagos, Akoka, Yaba, Lagos, Nigeria;(2) Department of Civil Engineering, College of Science and Technology, Covenant University, Canaanland, Km 10 Idiroko Road, Ota, Nigeria |
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Abstract: | An assessment of the pollution status of River Illo, located within River Owo catchments area in Ota, Ogun State, Nigeria,
was carried out. The River’s response to deoxygenation due to BOD loading from an abattoir and its dissolved oxygen (DO) level
was predicted using the modified Streeter-Phelps model. The average concentrations of measured parameters at the sampling
stations include: 2.24 mg/l of DO, 312.85 mg/l of BOD, 782.86 mg/l of chemical oxygen demand, and 620.76 g/l of total solids.
The DO model for River Illo showed a positive correlation between measured and calculated DO, while the dissolved oxygen curve
gave a double spoon shape of two major segments with distinct zones of degradation, decomposition, and recovery. The self-purification
factor (f) for both segments ranged between 0.8 and 1.1 depicting River Illo as a slow moving or sluggish river. The above results
revealed slow reaeration of the water body while full recovery from pollution was difficult. The treatment of River Illo before
usage is very essential to ensure public health safety of users from waterborne diseases. |
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Keywords: | Deoxygenation Reoxygenation Self-purification Assimilative capacity Oxygen sag |
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