The objective of this study is to characterize the solid household waste of the city of Thiès and to propose ways of valorization. In order to carry out this study, a physical characterization campaign was carried out using the household waste characterization method (MODECOM) modified and adapted to the national context. The results of this campaign revealed that the fines represent more than 50% of the flow emitted by the medium and low standing. For the high standings, this fraction represents only 40%. Putrescibles (between 5% and 20% depending on the standing), plastics, cardboard, composites and paper are the most produced by the population. Similarly, the granulometry is dominated by the fraction of fines followed by the average diameters. The daily ratio is 0.528 kg/capita/day.The main characteristics determined during the physicochemical characterization are the carbon-nitrogen ratio (27), the chemical oxygen demand (263.8 mg/g), the biodegradability (3) and the methanogenic potential (312.69). The methanization of this waste produced a biogas with a maximum methane content of 41%. This methanization was controlled by monitoring two main parameters which are temperature and pH.