Evaluation of the quality of drinking water distributed by the water distribution authority (REGIDESO) in the DRC: Case of the city of Kananga

The city of Kananga is supplied with drinking water by the water distribution company (REGIDESO), whose mission is to produce water free of impurities and pathogenic microorganisms—in short, water that meets WHO international standards. Therefore, we undertook to evaluate the levels of certain elements identified during the physicochemical analysis of our prepared samples. Following this physicochemical analysis, the following results were obtained and compared to WHO standards. These include: water from the Tshibashi River with a conductivity of 62.7, a turbidity of 2.16, and a total calcium carbonate (TCC) value. , ,

,

2) Water treated at the plant: pH=5.07, conductivity 120, turbidity 0.2, TAC = 1.23, Cl2= 0.226, colour 7.5  

3) Water treated at the mains: pH=5.95; cond=103; Turb=0.366

TAC = 0.33, Cl₂₌ 0.225; color = 5.03; NO₂ ₌ 0.027; as for the pb⁺ ion content

Y = 0.01558x + 0.37334, the results obtained show two strongly linear lines intersecting at a single point. The titration of pb ^{t2 with SO4-2} ions is 0.583514 with a standard deviation Sx ₌ 0.002181 and a relative error Er ₌ 0.37%.

The 95% confidence interval is 0.87

While the Cl- ion concentration decreases over time, as reflected by the slope of the regression curve (-0.01558), the correlation coefficient is not within the acceptable range: -1 indicates lower chlorine concentration as the distance increases. In short, of the parameters studied, the other elements either meet WHO standards or, for the most part, do not.

Methods: It is thanks to these so-called instrumental methods that we were able to prove that this water is unfit for daily consumption, as evidenced by the various results recorded in the different tables presented here.