Assessment of nitrate, phosphate and sulphate levels in wastewater from Muhammad Ayuba dam in Kazaure, Jigawa state, Nigeria
2021
S.O. Oladeji
In the continuation of the evaluation of the physicochemical parameters of wastewater of Muhammad Ayuba dam in Kazaure, Nigeria, this investigation was carried out for the assessment of certain nutrients parameters i.e., nitrate, phosphate and sulphate that are primarily responsible for the eutrophication. This investigation was conducted during November, 2019 to January, 2020 (Harmattan season) to measure the content of nitrate, phosphate and sulphate ions in the wastewater collected from Muhammad Ayuba dam. During the study, standard techniques were used to determine the content of nitrate, phosphate and sulphate using spectrophotometer at specific wavelengths in determination of parameter of interests. The results obtained indicated that the concentrations were in the range of 78.50 – 88.40 mg/L for nitrate, 55.70 – 62.40 mg/L for phosphate and 91.40 – 100.20 mg/L for sulphate ions, respectively. The contents of nitrate, phosphate and sulphate in the wastewater exceeded the limit set by FAO/WHO for these anions in wastewater with exception of sulphate ions that was below the limit. Pearson correlation (r = 0.484) of the different anions indicated that their level of contamination might be traced to the same source means runoff from fertilizer application. Therefore, the water of the dam is majorly polluted with domestic wastes and absolutely rich in sulphate ions especially detergents from nearby houses. The study also revealed gradual accumulation of anions in the wastewater of the dam suggested more pronounced pollution in it. Thus, regular monitoring of these ions must be required to evaluate their environmental impacts and possible potential risks.
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