Self-Purification Modelling of River Kaduna Middle Stretch: A Focus on Oxygen Demand Parameters and Hydraulic Properties
2023
Ogbozige, Francis James
The middle section of River Kaduna has been known of being polluted by both point and non-point pollutant sources however, a detailed modelling of the self-purification capacity of the river has not been done. Hence, this research investigated the relationship between some selected parameters with respect to the self-purification potential of the river. This was achieved by monthly analysis of the selected parameters which include saturated oxygen deficit (), water temperature (), Oxidizable organic matter present in water (), flow velocity () and depth of flow () across eight (8) sampling sites for 24months using standard methods. Results revealed that the loss of dissolved oxygen (deoxygenation) in the water quality due to pollutants, occurred at a rate lower than the dissolved oxygen recovery (reoxygenation) as the water flow downstream irrespective of sampling site and season. Hence, the self-purification capacity of the river based on Fair’s ratio was found to be higher than unity as it ranged from 1.45 to 3.98 notwithstanding, the higher values were recorded during rainy season. Results also informed that the modelled equation is more influenced by parameters and compared to , and in estimating the self-purification capacity of the river, and predicted values generated through the model had no significant difference with observed values, on t-test analysis at p < 0.01. Furthermore, the analysed results identified the most polluted zone within the monitored section of the river and necessary recommendations were made.
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