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SP Hounsinou
D Mama
M Boukari
D Sohounhloué

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SP Hounsinou
D Mama
M Boukari
D Sohounhloué

International Research Journal of Public and Environmental Health
Vol.2 (2),pp. 80-87, July 2015
ISSN 2360-8803
Available online at
Article 15/ID/JPRH021/08 pages
Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.

Original Research Article

Physicochemical studies of surface water pollution by leachate rubbish and eutrophication: A case study of Lake NOKOUE in Benin

Sagnon Parfait Hounsinou1,*, Daouda Mama1,†, Moussa Boukari1,† and Dominique Sohounhloué2

1Laboratoire d’Hydrologie Appliquée, Faculté des Sciences et Techniques, Université d’Abomey – Calavi, Bénin.
2Laboratoire d’Etude et de Recherche en Chimie Appliquée, Ecole Polytechnique d’Abomey – Calavi, Bénin.

†These authors contributed equally to this work

*Corresponding Author E-Mail:

Tel.: +229-95-155-105

date Received: February 20, 2015     date Accepted: March 10, 2015     date Published: July 15, 2015


Municipal waste produced in the town of Abomey-Calavi mainly composed of household waste, which are disposed and evacuated into landfills. These discharges are devoid of collection and processing device of brownish liquid effluents known as leachate. We then hypothesized that landfills located on the banks of the rivers are sources of pollution of rivers and are partly responsible for their eutrophication. Four leachate sampling sites were sampled within the discharges Topka-Zongo on the shore of Lake NOKOUE and six surface water sampling sites of Lake NOKOUE including two away from the shore were sampled. This study aims to make a physical and chemical characterization of the leachate, highlight their impact on the physical and chemical quality then the eutrophic state of the surface water of Lake NOKOUE. To do this, we performed a series of sampling, from March to June 2014. During this period, the physical and chemical analyzes performed on samples of leachate, revealed high levels of phosphates (PO43- average = 115 mg / L) and ammonium (NH4 + average = 77 mg / L). This mineral leachate pollution has resulted in a high electrical conductivity with a maximum value of 4512 µS / cm. Organic pollution is also present in the leachate; the average value of COD recorded is 940 mg / O2 / L. That of BOD5 is 450 mg / O2 / L. The ratio of BOD5 /COD is 0.47. The lake near the shore indicated evidence of pollution than those from the shore and have chemical and physical characteristics consistent with the values found in the raw leachate. This proves the pollution status of the lake by the landfill leachate. The risk of eutrophication was assessed by Ifremer diagnostic grid (2000) and noted that the lake NOKOUE is in a hyper eutrophic state.

Key words: Discharge, leachate, surface water, pollution, physical and chemical parameters, eutrophic

Hounsinou et al