Volume 78, Issue 1, April 2025, Pages 64–77
Aïssatou Ghislaine KONE1, Jean Louis PERRIN2, Kandana Marthe Yéo3, Jean Thierry Koffi KOFFI4, Serge Éhouman Koffi5, Eric Zahiri6, and Lanciné Droh GONE7
1 Science and management of Environment, Nangui Abrogoua University, Abidjan, Côte d’Ivoire
2 Institut de Recherche pour le Développement - HydroSciences Montpellier, UMR 5569 (IRD, UM, CNRS), Montpellier, France
3 Centre de Recherche Ecologique, Université Nangui Abrogoua, 08 BP 109 Abidjan 08, Côte d’Ivoire
4 Science and management of Environment, Nangui Abrogoua University, Abidjan, Côte d'Ivoire
5 Science and management of Environment, Nangui Abrogoua University, Abidjan, Côte d’Ivoire
6 LASMES, UFHB, Abidjan, Côte d’Ivoire
7 Science and management of Environment, Nangui Abrogoua University, Abidjan, Côte d'Ivoire
Original language: English
Copyright © 2025 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
A physico-chemical characterisation of urban wet weather discharges (UWWDs) was carried out on a residential catchment of Riviera Palmeraie in the Abidjan District. This neighborhood is characterised by periodic drainage channel overflows, which have caused several floods in recent years. In order to determine the temporal variability of pollutant concentrations and their transfer dynamics, 5 floods were sampled between November 2021 and April 2023. Physico-chemical parameters such as pH, electrical conductivity (EC), total suspended solids (TSS), chemical oxygen demand (COD), ammonium, nitrite, nitrate, total nitrogen (TN), total phosphorus (TP), and phosphate were determined. Descriptive analysis of these parameters and the associated statistical tests showed that urban wet weather discharges are alkaline (pH 9.92), highly loaded with TSS (19.3 g.L-1) and moderately mineralised (EC 698 µS cm-1). While construction sites and soil erosion in the catchment are the main sources of TSS, the high values for electrical conductivity and concentrations of ammonium, total nitrogen and total phosphorus are directly related to wastewater discharges into the drainage system and leaching from the urban areas as a whole. Nitrogen and phosphorus pollution is predominantly in particulate form and is strongly correlated with TSS (r = 0.86) for most floods. For all the sampled floods, discharge and electrical conductivity appear to be good descriptors of ammonium dynamics. Suspended solids also appear to be good descriptors of total nitrogen and total phosphorus dynamics.
Author Keywords: wastewater, suspended solids, nitrogen and phosphorus nutrients, drainage system, pollution, water quality guidelines.
Aïssatou Ghislaine KONE1, Jean Louis PERRIN2, Kandana Marthe Yéo3, Jean Thierry Koffi KOFFI4, Serge Éhouman Koffi5, Eric Zahiri6, and Lanciné Droh GONE7
1 Science and management of Environment, Nangui Abrogoua University, Abidjan, Côte d’Ivoire
2 Institut de Recherche pour le Développement - HydroSciences Montpellier, UMR 5569 (IRD, UM, CNRS), Montpellier, France
3 Centre de Recherche Ecologique, Université Nangui Abrogoua, 08 BP 109 Abidjan 08, Côte d’Ivoire
4 Science and management of Environment, Nangui Abrogoua University, Abidjan, Côte d'Ivoire
5 Science and management of Environment, Nangui Abrogoua University, Abidjan, Côte d’Ivoire
6 LASMES, UFHB, Abidjan, Côte d’Ivoire
7 Science and management of Environment, Nangui Abrogoua University, Abidjan, Côte d'Ivoire
Original language: English
Copyright © 2025 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
A physico-chemical characterisation of urban wet weather discharges (UWWDs) was carried out on a residential catchment of Riviera Palmeraie in the Abidjan District. This neighborhood is characterised by periodic drainage channel overflows, which have caused several floods in recent years. In order to determine the temporal variability of pollutant concentrations and their transfer dynamics, 5 floods were sampled between November 2021 and April 2023. Physico-chemical parameters such as pH, electrical conductivity (EC), total suspended solids (TSS), chemical oxygen demand (COD), ammonium, nitrite, nitrate, total nitrogen (TN), total phosphorus (TP), and phosphate were determined. Descriptive analysis of these parameters and the associated statistical tests showed that urban wet weather discharges are alkaline (pH 9.92), highly loaded with TSS (19.3 g.L-1) and moderately mineralised (EC 698 µS cm-1). While construction sites and soil erosion in the catchment are the main sources of TSS, the high values for electrical conductivity and concentrations of ammonium, total nitrogen and total phosphorus are directly related to wastewater discharges into the drainage system and leaching from the urban areas as a whole. Nitrogen and phosphorus pollution is predominantly in particulate form and is strongly correlated with TSS (r = 0.86) for most floods. For all the sampled floods, discharge and electrical conductivity appear to be good descriptors of ammonium dynamics. Suspended solids also appear to be good descriptors of total nitrogen and total phosphorus dynamics.
Author Keywords: wastewater, suspended solids, nitrogen and phosphorus nutrients, drainage system, pollution, water quality guidelines.
How to Cite this Article
Aïssatou Ghislaine KONE, Jean Louis PERRIN, Kandana Marthe Yéo, Jean Thierry Koffi KOFFI, Serge Éhouman Koffi, Eric Zahiri, and Lanciné Droh GONE, “Physico-chemistry of urban wet weather discharges in the Riviera Palmeraie catchment, Abidjan (Ivory Coast),” International Journal of Innovation and Scientific Research, vol. 78, no. 1, pp. 64–77, April 2025.
