Physico-chemical characterization of liquid waste from sugar production unit labs in Zuenoula, Côte d'Ivoire

Managing liquid waste from the laboratories of Integrated Agricultural Unit (IAU) of Zuénoula (Côte d´Ivoire) is a major concern for the decision-makers of the company, who are working to solve this problem in their sustainable development policy. This work aims at quantifying liquid waste from the agronomic laboratories and factory of IAU of Zuénoula and to assess their level of pollution. The quantities of waste produced daily are estimated at 28.5 L, 52.6 L and 2600 L respectively for waste from the agronomy laboratory, the factory laboratory and from the rinsing water from latter's glassware. The following parameters were analyzed, temperature, pH, conductivity, turbidity, total suspended solids, COD, BOD5, total nitrogen, total phosphorus, zinc, copper, lead and mercury. The results of these analyzes generally showed that waste produced did not comply with national standards. In particular, the level of lead was very high in these liquid wastes and reached 160 times the standard value. These results require a waste treatment system, which would reduce all the parameters, in particular those of the most noxious metals (lead and mercury).Keywords: Heavy metals, Pollution, Industrial unit, Ivorian standards, Wastewater

Inventaire Et Identification Des Plantes Melliferes De La Zone Guineenne : Cas De La Foret Yapi Daniel Et Extension (Sud De La Cote D’ivoire)

Dans le cadre des études de classement de la forêt Yapi Daniel en réserve naturelle, une étude sur sa flore mellifère et ses environs a été réalisée. Les plantes mellifères ont été identifiées par observation directe dans des placettes de 1600 m² installées de manière aléatoire dans la forêt et par des relevés itinérants dans un rayon d'un kilomètre autour du rucher. Au total, quarante-huit (48) plantes mellifères ont été inventoriées, dont 35 répertoriées dans la forêt avec un taux de sélection de 13,20% des 265 plantes à fleurs de la forêt. Ces plantes se répartissent en 43 genres et 19 familles botaniques. Les Malvaceae, les Fabaceae, les Combretaceae et les Moraceae sont les plus fournies en espèces. 85,41% sont des plantes spontanées composées d'arbres et d'arbustes (77,08%), qui fleurissent majoritairement (60,41%) pendant la saison des pluies (Avril-Juillet; Octobre-Novembre) et dont près de la moitié (44%) sont butinées pour le nectar. Within the framework of the studies for the classification of the Yapi Daniel forest as a nature reserve, a study on its honey-bearing flora and its surroundings has been carried out. Melliferous plants were identified by direct observation in plots of 1600 m² installed randomly in the forest and by itinerant surveys in a radius of one kilometer around the apiary. A total of forty-eight (48) honey plants were inventoried, 35 of which were found in the forest with a selection rate of 13.20% of the 265 flowering plants in the forest. These plants are divided into 43 genera and 19 botanical families. Malvaceae, Fabaceae, Combretaceae and Moraceae are the most abundant in species. 85.41% are spontaneous plants composed of trees and shrubs (77.08%), which flower mostly (60.41%) during the rainy season (April-July; October-November) and almost half (44%) are collected for nectar

Phytoplankton Composition and trophic state of Guessabo lake (Upstream in Buyo lake, Ivory Coast)

Objectives: The trophic quality of Guessabo Lake (Ivory Coast) under the influence of fishing and agriculture was analysed starting according from the phytoplankton composition. Methodology and results: Sampling spatio-temporal in pelagic zone were made from a plankton net and supplemented with an integrated sampler. A total of three hundred and forty six species were identified. The groups, by orders of prevalence are, Chlorophyta with 164 species (48 %), Euglenophyta with 64 species (19 %), Cyanobacteria represented by 53 species (16 %), Bacillariophyta with 50 species (15 %) and, the other groups (Pyrrophyta, Chrysophyta and Xanthophyta) represented by 15 species (4 %). On the level of sampling stations of Guessabo Lake, 239 species were identified in Guemon sector against 231 and 257 species respectively in bed of the lake and Haut Sassandra sector. Concerning Guemon sector, 181 species were recorded at station G1 and 192 at station G5. In bed of lake (Channel), 154 species were listed at station G2, whereas 157 and 168 species were observed respectively at stations G4 and G6. For Haut Sassandra, stations G3 and G7 respectively presents 208 and 211 species. During this study, 103 species constant were listed against 66 species additional and 170 species accidental. In the floristic list, 73 species are common to all sampling stations. Sorensen index showed a similarity between the sectors and sampling stations. Trophic index based on Phytoplankton composition indicated that lake is from mesotrophy to eutrophy state. Key words: Phytoplankton, lake, mesotrophy, eutrophy; Ivory Coast