A proliferation of hotels in major cities in developing countries such as Benin leads to more waste water production. The present work aims to evaluate the efficiency of the wastewater treatment methods of Cotonou hotels. But after investigation, most hotels do not have a wastewater treatment plant. During the investigation, wastewater samples were collected and analyzed. The measurement of the field parameters was made with a pH meter, a conductivity meter and a turbidimeter. BOD5 was measured by respirometry and COD by colorimetry. A molecular absorption spectrophotometer was used to measure: suspended matter, total nitrogen and total phosphorus content. Microbiological parameters were determined by the incorporation technique. These analyzes show that the effluents at the entrance of the stations are heavily loaded with pollutants. However, significant declines are observed on site n°4 (activated sludge) with non-standard values only for phosphorus and Escherichia coli. The adoption of a disinfection and phosphorus removal treatment would make it possible to obtain water of acceptable quality for reuse of these waters in irrigation.

In the present study, Phenolic compounds of ethanolic extracts of three organs (leaves, stem barks and roots) of Pterocarpus erinaceus were studied in UV-Visible Spectrophotometer. Furthermore the antiradical activity of these extracts was determined at room temperature by the method based on the reactivity of the extracts with a free radical, stable in solution, the l, l-diphenyl-2-picrylhydrazyl (DPPH). A synthetic antioxidant commonly used in the food and cosmetic industry, quercetin was used as reference to validate the antioxidant potential of phenolic extracts studied. The preliminary assessment of the phytochemical composition of this plant revealed the presence of polyphenols, tannins, free flavonoids, coumarins, terpenes, sterols and anthocyanins. The colorimetric assay revealed that the polyphenols are more concentrated in the bark of Pterocarpus erinaceus rod than in the leaf and root bark of the plant. Similarly, the stem bark of Pterocarpus erinaceus was more active than the leaf and bark of the root, although lower than the standard used (quercetin) activity. The evaluation of the granulometry influence revealed that the extraction solvent diffuses more easily inside the small particles to extract polyphenol molecules.

Herbal medicines are the most widely used especially in rural areas to solve problems of human and animal health Saharan average. This paper reports the results of the chemical and biological studies of the root bark of Cochlospermum planchoni used by farmers in Benin in the treatment of gastrointestinal diseases of animals. Results obtained, it appears that the root bark of C. planchoni is rich in secondary metabolites such as flavonoids, polyphenols, tannins, anthocyanins, leucoanthocyanins, mucilages, saponins, sterols and terpenes. Regarding the extraction yield, the binary water-ethanol (50/50) allowed to have a better (23.2%) extraction yield this of plant. As for the quantification of the polyphenols content, it is practically insensitive to the nature of the extraction solvent on crude extracts of the root bark of C. planchoni. According to the tests of antiradical activity, both fractions ethyl ether and ethyl acetate (IC50 = 1?g/ml) showed a more interesting radical scavenging activity than that of quercetin (IC50 = 3?g/ml) and BHA (IC50 = 4, 8?g/ml) which are antiradical syntheses. The results from the test of antibacterial activity show that the fractions of ethyl acetate, diethyl ether and butanol are more active than of the crude extracts of C. planchoni on the four bacterial strains used in this study.