Pineapple leaves are usually buried or left to rot in the fields after the fruit is harvested. The aim of this study to harness the potential of plant fibers present in pineapple leaves to product hair strands. in order to reduce the dependence on synthetic resources derived from petroleum, which are often used in the production of strands. conventional capillaries. The methodology used includes several essential steps. First, the fibers are extracted manually. The fibers are then bleached using a 6% aqueous NaOH solution for 6 hours to remove any unwanted pigmentation, increase their versatility and achieve an optimal balance between whiteness and strength. The fibers were colored with natural indigo-based dyes. Color saturation and different shades are obtained by letting them soak for between 45 and 90 min. Finally, the colored fibers are immersed in a mixture of beeswax (90%) and paraffin (10%) to significantly improve their flexibility and water resistance. The wicks thus obtained have appreciable aesthetic and mechanical characteristics which are beneficial for the preservation of the environment.

The aim of this work is to study the physical and chemical characterization of wastewater at the level of the student residences of the university’s campus of Abomey-Calavi in order to propose in the medium term an adequate system of treatment of these wastewaters. The study evaluate quantity of water used by students per day and the pollutant loads in them and the methods of storage and disposal of wastewaters of students residences. Showers, laundries and kitchens are the main systems that generate wastewater. The receptacles of these waters are the sumps which also receive wastewaters from the septic tanks of the toilets. These wastewaters are then rejected in the Nokoue lake. The approximate number of students wastewaters generator in residences is 3904. The amount of wastewaters produced daily and collectively by the residents of the university campus is approximately 292800L. From analyzes conducted on these waters, it appears that they have the characteristics of domestic wastewaters and the ratio COD / BOD5 shows that these wastewaters are little biodegradable. Moreover, they don’t comply with beninese standards for the discharge of domestic wastewaters. This huge amount of wastewaters is not without consequences on the health of campus users and the environment. The campus of university of Abomey-Calavi does not also have a wastewaters treatment system. Appropriate measures should be taken to improve the management of these wastewaters.

Management of domestic sewage and runoff poses enormous problems in major cities of Benin. These waters are mostly dumped in the streets or gutters that drained them to make referrals for various rivers without any treatment, causing the chemical pollution of these.
This study focused on the physicochemical characterization of household sewage and runoff from the city of Cotonou and the impact of the spill on their chemical quality of the channel of the city. Indeed, they are water troughs and water seeping from very heterogeneous and harmful to human body wastes deposited by residents on the banks of the channel. These wastes contain sources of phosphate, sulfate, chloride and nitrate from the decomposition of nitrogenous.
The results of this work indicate the parameters analyzed for the following values: dissolved O2 (1.5 to 3.2) mg / L; BOD5 (165 to 940) mg/L ; COD (350 to 2250) mg / L; NO3- (1.1 to 3.8) mg/L ; NO2- (0,07 to 2,6) mg/L ; PO43- (1.0 to 3,6) mg/L.These values are very high and demonstrate the levels of physical and chemical pollution enough pronounced of the water of the channel. The quality of the channel's water is mortgaged. This raises a number of measures to clean up it.