Monitoring and Assessment of Pollution-Induced Dissolved Oxygen Variation in River Challawa
The indiscriminate dumping into the river of waste water and urban sewage may have a detrimental effect on the health of aquatic life. The goal of the study is to investigate the impact of industrial effluent on the water quality of the Challawa River. Chemical analyses of river water samples collected at predetermined sampling points along a stretch of 10,644 km were carried out and ANOVA and regression analyses were carried out. The results obtained indicated that the DO values ranged from 2,4 mg/l to 1,9 mg/l, while the BOD5 values ranged from 443 mg/l to 1654 mg/l; the COD values ranged from 1296 mg/l to 4565 mg/l. For the River Challawa, the self-purification factor (f) ranges between 0.40 per day and 0.56 per day, putting the river as a highly polluted stream in the slow stream group. Results showed that the integration of the variability of k2 in the determination of the oxygen sag equation predicted values closer to the measured values than when it was ignored.The predictions suggested substantial relationship with the observed values at 95 percent level of significance.
Dr. T. A. Adedokun
Department of Civil Engineering, Bayero University Kano, Kano State, Nigeria.
J. C. Agunwamba
Department of Civil Engineering, University of Nigeria, Nsukka, Enugu State, Nigeria.
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