Lagoon pollution and nutritive compounds change in urban tropical area

The aim of this study was to highlight the role of urban pollution on nutrient levels changes in lagoon environment under influence of hydroclimate. The ratio of biological and chemical oxygen demand BOD/COD was 0.7 with a significant average oxidizable matter charge (320 mg/L). Evolution of COD, BOD, NTK (total nitrogen) and Pt (total phosphorus) from 3.4 mm to 84.5 mm of rainfall, range from respectively, <50 mg/L, <50 mg/L, <0.3 mg/L, 48 mg/L to 419.75 mg/L, 275 mg/L, 1.875 mg/L, 4.55 mg/L. The (bio) availability of phosphate, ammonium and/or nitrate in water column changed depending on environmental conditions. The evolution of these pollutions effects may jeopardize the sustainability of the Abidjan lagoon system.Keywords: Wastewater, Ebrie Lagoon, rainfall, oxidizable organic matter, suspended particles, nutrients, eutrophication