The presence of a high level of organic matter in solid household waste is a positive criterion for considering waste recovery through composting.This research aimed at studying of the impact of the fermentable fraction of municipal solid waste during composting. Five (5) mixtures have been developed and in each of the treatments, the added fermentable fraction represents 25 or 50% of the removed fraction. The temperature, Total Organic Carbon, nitrogen and pH values of each treatment were determined during the maturation process of the compost manufacturing trials according to the different constituents.Results revealed a strong positive correlation (r2= 0.8566) between the total organic carbon and the fraction of total organic matter in the mixtures submitted to composting. From the analysis of the compost treatments carried out, it appears that the inputs of the T50v treatment (treatment obtained by substituting 50% of vegetable matter with the fermentable fraction of the MSW) are well degraded at the end of composting. Consequently, they would bring a substantial quantity of organic matter as a soil amendment, despite a slightly high C/N ratio that could be compensated by an input of nitrogen compounds. This mixture could enrich the soil with a substantial quantity of humic substances.

The objective of this study is to evaluate the quality of underground water according to the standards of Beninese and international drinkability. The choice of watering place centres on daily usages as beverage. The physicochemical and bacteriological parameters have been determined according to the conventional methods. The obtained results show that the studied waters are characterized by an acidic- pH (6.74 – 6.95), a temperature which varies from 27.3°C to 30.4°C, a weak electric conductivity (8.9μS/cm – 588 μS/cm), weak TDS (5mg/L – 270mg/L) and a low potential of reduction-oxidation (202 mV – 344 mV). Besides, the following medium concentrations have been obtained : Sulphate (0.19 mg / L – 36.55 mg / L), Nitrate (4.60 mg / L – 53.28 mg/L), Calcium (0.7 mg/L – 57.46 mg/L), Potassium (0.22 mg/L – 21.02 mg/L), Magnesium (0.01 mg/L – 18.33 mg/L), ammonium (0.02 mg/L – 18.33 mg/L) and Chloride (0.20 mg / L – 55.55 mg/L). Among the studied places, only the well P1 revealed contents in potassium and in nitrate beyond the standards of drinkability. The results of bacteriological analysis confirm the presence in very appreciable numbers of fecal contaminated indicators (Total Coliforms, Fecal Coliforms and Escheriachia-Coli) in the wells except the well P5. Moreover, the Fecal Streptococci have been displayed prominently in the well P6. So at the end of this study, we can deduce that wells studied waters roughly present the serious health risks to the population contrary to the drilling wells and springs water.