Physicochemical assessment of urban wastewater of Cotonou (Benin)
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Date
2021-02-17
Journal Title
Journal ISSN
Volume Title
Publisher
Water Science & Technology
Abstract
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 ¼ 5,912 ± 1,026 mg/L, Abs.UV254 ¼ 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
Description
Keywords
organic pollution parameter, urban wastewater, UV absorbance 254, A. V. Onesime Akowanou, Martin Pépin Aïna, Patrick Drogui, University of Abomey Calavi, C2EA, Benin