African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 4900

Full Length Research Paper

Impact of faecal bacteria contamination on drinking water supply in Aghien Lagoon, Abidjan, Ivory Coast

Nouho Koffi Ouattara
  • Nouho Koffi Ouattara
  • Laboratory of Environment and Aquatic Biology, University of Nangui Abrogoua BP 801 Abidjan 02, Ivory Coast.
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Cyr-Kevin Yao Kouamé
  • Cyr-Kevin Yao Kouamé
  • Laboratory of Environment and Aquatic Biology, University of Nangui Abrogoua BP 801 Abidjan 02, Ivory Coast.
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Bamory Kamagaté
  • Bamory Kamagaté
  • Laboratory of Geosciences, University of Nangui Abrogoua BP 801 Abidjan 02, Ivory Coast.
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Lanciné Goné Droh
  • Lanciné Goné Droh
  • Laboratory of Geosciences, University of Nangui Abrogoua BP 801 Abidjan 02, Ivory Coast.
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Allassane Ouattara
  • Allassane Ouattara
  • Laboratory of Environment and Aquatic Biology, University of Nangui Abrogoua BP 801 Abidjan 02, Ivory Coast.
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Germain Gourène
  • Germain Gourène
  • Laboratory of Environment and Aquatic Biology, University of Nangui Abrogoua BP 801 Abidjan 02, Ivory Coast.
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  •  Received: 08 October 2018
  •  Accepted: 08 November 2018
  •  Published: 14 November 2018

Abstract

In developing countries, urban surface waters are particularly affected by faecal pollution from domestic wastewaters due to the lack of sanitation and wastewater treatment plants. The presence of pathogenic microorganisms limits the uses of these waters for recreation and economic activities. In Ivory Coast, due to the important gap between water demand and water supply in urban areas, use of surface waters for the production of drinking waters becomes a serious alternative. Actually, there is no monitoring program to control pollution discharges into these surface waters. In this study, a monitoring study was planned from September 2015 to February 2017 in order to evaluate the level of faecal pollution of the Aghien lagoon, a potential drinking water supply located in Abidjan. Based on the enumeration of faecal indicator bacteria (Escherichia coli and Intestinal enterococci), microbiological water quality from Aghien Lagoon and its tributaries were evaluated. Abundance of faecal indicators ranged between 1.72 × 101 CFU.100 ml-1 and 1.48 × 102 CFU.100 mL-1 for E. coli and between 2.26 × 103 CFU.100 mL-1 and 7.72 × 103 CFU.100 mL-1 for IE in lagoon waters. The abundances of FIB observed in tributaries were higher than those observed in lagoon water. The tributaries comparison indicates that, the Djibi River is the most contaminated with an average value of 1.73 × 106 CFU.100 mL-1 for IE and 6.92 × 105 CFU.100 mL-1 E. coli mL. The contributions of tributaries in terms of faecal bacteria discharged into the Aghien lagoon are not negligible and these contributions are significantly different between the dry and rainy season. Therefore, lagoon water may be a potential drinking water supply if wastewater treatment plants are implemented in the Djibi and Bété basins.

 

Key words: Water quality, faecal bacteria, drinking water supply, tropical lagoon.