This study is part of a search for sustainable solutions for access to drinking water in rural areas of Côte d’Ivoire, where boreholes in bedrock areas are the main source of drinking water supply. The objective is to statistically analyse the flow rates (Q, in m3/h) of water boreholes in the N’zi-Comoé region in order to assess their variability, distribution and relevance in characterising the aquifer potential in bedrock environments. To do this, descriptive statistics and the Shapiro-Wilk and Chi2 statistical tests of normality were used. This approach yielded relevant results, namely an average flow rate of 5.71 m3/h, which is lower than the standard deviation, and a coefficient of variation of 131%. These values indicate a high degree of heterogeneity in flow rates in the N’ZI-Comoé region. This highlights the discontinuous nature of the aquifer tapped for drinking water supply not only in the study area but also in the bedrock environment in Côte d’Ivoire.
Sludge produced in drinking water treatment plants (DWTP) is discharged into environment every day, even they are rich in phosphorus-reactive elements. The objective of this study was to evaluate the removal of phosphorus using sludge from DWTP of the city of Sinematiali (Côte d’Ivoire). The sludge was packaged in granules and put in contact in beaker with synthetic water et effluent from domestic wastewater treatment plant. The results demonstrated that the sludge was rich in aluminum (307.6 ± 0.6 g/kg) and iron (208.7 ± 1.2 g/kg), two phosphorus removal agents. Phosphorus removal was described mainly by adsorption process, which equilibrium was reached after 4 h of contact time at pH 5. Removal of phosphorus from wastewater was around 70% in synthetic wastewater and 42.5% in real wastewater. Removal rate was enhanced when the sludge dosing increased from 10 to 40 g/l, from 42.5 to 87.5%. The adsorption of phosphorus is described by the Langmuir isotherm with qm = 1.72 mg/g and kinetic removal followed pseudo-order 2 model (k2 = 0.023 g/mg.min). Sludge from DWTP of Sinematiali demonstrated good phosphorus removal potential.
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