Identification of the most correlated input and output physicochemical parameters in domestic wastewater at experimental treatment facilities in Nouakchott, Mauritania

Résumé

The study was conducted on domestic wastewater collected at the National Sanitation Office monitoring station and treated using three experimental cylindrical filters (200 L) with a filtering medium 0.70 m high.The treatment achieved average removal efficiencies of 41.42% for biochemical oxygen demand (BOD₅), 39.11% for chemical oxygen demand (COD), and 23.30% for total suspended solids (TSS), all within acceptable ranges.Average removal rates of 40.50% and 57.64% were obtained for nitrogen and orthophosphate, respectively, along with a significant improvement in hydrogen potential (pH).The links between correlated variables were investigated using multivariate statistical methods, including principal component analysis and hierarchical clustering.The results show a significant reduction in pollutant loads after treatment, particularly in BOD₅, COD, TSS, nitrogen, orthophosphate, and hydrogen potential.PCA highlights the principal axes of variability, and hierarchical classification distinguishes groups of parameters with similar water quality.

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