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Characterization of the domestic wastewaters and dimensionality of a pilot treatment station by lagooning at Abomey Calavi city- Benin

Author Affiliations

  • 1Lab. des Sciences et Techniques de l’Eau de l’Ecole Polytechnique d’Abomey Calavi, UAC, Cotonou, BENIN and Lab. d’Etude et de Recherche en Chimie Appliquée, Ecole Polytech. d’Abomey/Calavi, UAC, Cotonou, BENIN
  • 2Lab. des Sciences et Techniques de l’Eau de l’Ecole Polytechnique d’Abomey Calavi, UAC, Cotonou, BENIN
  • 3Lab. Pierre Pagney, Climat, Eau, Environ., Dévelopement (LACEEDE) /DGAT/FLASH, Université d’Abomey-Calavi, BENIN
  • 4Lab. des Sciences et Techniques de l’Eau de l’Ecole Polytechnique d’Abomey Calavi, UAC, Cotonou, BENIN
  • 5Lab. des Sciences et Techniques de l’Eau de l’Ecole Polytechnique d’Abomey Calavi, UAC, Cotonou, BENIN
  • 6Lab. d’Etude et de Recherche en Chimie Appliquée, Ecole Polytech. d’Abomey/Calavi, UAC, Cotonou, BENIN

Res. J. Engineering Sci., Volume 1, Issue (1), Pages 45-50, July,26 (2012)

Abstract

This study has been conducted to characterize the household wastewaters rejected by the populations of Tokpa-Zoungo, a populous district of the city of Abomey-Calavi in Southern Benin. The laboratory analyses on samples of wastewaters taken from the cesspools, and near several compounds (houses) in the study area, revealed that the average load of polluting effluents to be treated is important (36O mg / l COD, 180 mg / l for BOD5). The results show that the wastewaters rejected by the inhabitants are perfectly biodegradable. A treatment by lagooning, using microphyte with three stabilization basins yielded good results with the targeted purifying output being about 88%. The water thus treated is susceptible to be in conformity with discharge standards in sensitive areas such as the lake Nokoué which is the receiving medium in this case. The study also suggested a network for the collection of wastewaters rejected by the populations of the study zone. Wastewater treatment plant (WWTP) therefore will be the primary waste water receiving entity. Two phases have been achieved during the course of the present study, the first one being the topographic surveys that have been conducted to measure the slopes and the pressure drops to the WWTP, and the second. The dimensioning of the pipes to insure drainage of waters to the wastewater treatment plant WWTP.

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