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Physicochemical assessment of urban wastewater of Cotonou (Benin).


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Arêmou Daouda, Mohamed M., Peace Hounkpè, S., Belfrid Djihouessi, M., Onesime Akowanou, Akuemaho Virgile, Aïna, Martin Pépin et Drogui, Patrick ORCID: https://orcid.org/0000-0002-3802-2729 (2021). Physicochemical assessment of urban wastewater of Cotonou (Benin). Water Science and Technology , vol. 83 , nº 6. p. 1499-1510. DOI: 10.2166/wst.2021.073.

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The present study aims to fill the data gap analysis in urban wastewaters characteristics in Benin and its statistical analysis. Physicochemical parameters such as pH, electrical conductivity (EC), Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD₅), Total Kjeldahl Nitrogen (TKN), Total Phosphorus (TP) and UV Absorbance at 254 nm, were determined on domestic (greywater and blackwater) and industrial (hospital, pharmaceutical and commercial laundry) wastewater in Cotonou city. Analysis of variance showed a strong significant difference in the physico-chemistry of the various effluents. The pharmaceutical wastewater has the highest concentration of organic pollution (COD = 5,912 ± 1,026 mg/L, Abs.UV254 = 2.667 ± 0.327 cm⁻¹). The organic load of blackwater is mainly in particulate and biodegradable form. Besides, the correlation study showed the limits of pH and EC as an indicator of organic load. Furthermore, the choice of COD or BOD₅ as the main design parameter would be limited to blackwater treatment. Abs.UV254 was found to be the parameter having a strong relationship with other parameters of all effluents except blackwater. It then takes priority over COD for the treatment of greywater and industrial wastewater. For future wastewater treatment plant design, we recommend to consider Abs.UV254 as an important parameter.

Type de document: Article
Mots-clés libres: organic pollution parameter; urban wastewater; UV absorbance 254
Centre: Centre Eau Terre Environnement
Date de dépôt: 21 avr. 2021 15:00
Dernière modification: 15 févr. 2022 16:35
URI: https://espace.inrs.ca/id/eprint/11744

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