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Negative Impacts of the Practices of Acadjas on the Aheme Lake in Benin

Journal of Environmental Protection 2014年第4期5卷 301-309页

作者： comlan achille dedjiho Abdoukarim Alassane Waris Chouti Etienne Sagbo Odilon Changotade Daouda Mama Moussa Boukari Dominique C. K. Sohounhloue 1Laboratoire d’Hydrologie Appliquée (LHA) Faculté des Sciences et Techniques (FAST) Université d’Abomey-Calavi Cotonou Bénin 2Laboratoire de Chimie Inorganique et de l’Environnement Faculté des Sciences et Techniques (FAST) Université d’Abomey-Calavi Cotonou Bénin Laboratoire d’étude et de Recherche en Chimie Appliquée (LERCA) école Polytechnique d’Abomey-Calavi (EPAC) Université d’Abomey-Calavi Cotonou Bénin Laboratoire d’Hydrologie Appliquée (LHA) Faculté des Sciences et Techniques (FAST) Université d’Abomey-Calavi Cotonou Bénin Laboratoire de Chimie Inorganique et de l’Environnement Faculté des Sciences et Techniques (FAST) Université d’Abomey-Calavi Cotonou Bénin

The objective of this study is to reveal the negative impacts of the practices of acadjas on the Aheme lake in Benin. Various material and methods were used for the measures of the physicochemical parameters such as: colorimetric HACH DR/890, the multiparameter WTW 340i and specific kits for the dosage of minerals. Also, the investigations were made with the resources by persons. It emerges from this study that the practices of acadjas asphyxiate and disturb the lake species. In fact, the concentrations in dissolved oxygen became very weak (1595 mg/L to 3740 mg/L), and the contents of nitrites (2, 25 mg/L to 14, 5 mg/L), suspension materials and turbidity are raised. The consequences both on the aquatic fauna and on the vegetation of the bank are worrying. The waterside populations are also threatened. Some actions in an attempt to regulate the practice of acadjas and promote reforestation of the lagoon bank need to be put in place.

关键词： Acadjas Negative Impacts Aquatic Fauna Aheme Lake Benin

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Evaluation of the Opuntia dillenii as Natural Coagulant in Water Clarification:Case of Treatment of Highly Turbid Surface Water

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Journal of Water Resource and Protection 2013年第12期5卷 1242-1246页

作者： Yewegnon Alima Esther Irma Nougbode Cokou Pascal Agbangnan Alain Yaya Koudoro comlan achille dedjiho Martin Pepin Aina Daouda Mama Dominique Codjo Koko Sohounhloue Laboratoire d’Hydrologie Appliquée(LHA) Facultédes Sciences et TechniquesUniversite d’Abomey-CalaviCotonouRépublique du Bénin Laboratoire d’Etude et de Recherche en Chimie Appliquée(LERCA) Ecole Polytechnique d’Abomey Calavi(EPAC)Universite d’Abomey-CalaviCotonouRépublique du Bénin

This study was performed in laboratory scale and consisted of the using of aqueous Opuntia dillenii solution for the clarification of very turbid surface water (Turbidities varying between 186 NTU and 418 NTU). This plant from Cactaceae family was used as a natural coagulant for the different clarification tests. The preliminary phytochemical Screening of the powder of this plant showed that it contains tanins, saponins and mucilages. Flocculation and coagulation tests showed that Opuntia dillenii can be used in highly turbid water treatment. The removal efficiency varied from 89% to 93% for the turbidity and suspended solids, and from 4% to 15% for the obvious color in water when we used the optimum values of this natural coagulant (1 mL to 10 mL). The successive addition of this natural coagulant and the lime, gave a better elimination of turbidity and suspended solids, and a good reduction for the color. The removal efficiency of the turbidity and suspended solids became more than 95% and the one of the color between 67% and 94%.

关键词： Natural Coagulant Opuntia dillenii Lime Phytochemical Screening Turbidity Suspended Solids

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