Several factors threaten the integrity of aquatic ecosystem resources in the Democratic Republic of Congo. The banks of the Pool Malebo (Congo River) are also vulnerable to the presence of plastic pollution in its waters. This study aims to inventory the different types of microplastics in three compartments (water, sediment and fish) of the Congo River in the part of the Pool Malebo between the fishing stations of Maluku and Kinsuka in Kinshasa. The search for microplastics was carried out by trapping with the Manta net. The identification and classification of plastic debris recorded in the three compartments of the Congo River were done on the basis of the density of microplastics. The results obtained showed that the physical and chemical parameters of the waters of the Congo River in the Pool Malebo generally contribute to the disintegration of macroplastics into microplastics. All the digestive tracts of the sampled fish have microplastics and the consequences on the food chain are obvious especially tourists and other populations consuming these fish. From the point of view of relative abundance of waste, PELD with 35 debris or 79.5% are the most numerous than PP with 9 debris or 20.4%. Given the danger that microplastics represent for aquatic animals and human health, further research based on the characterization of plastic waste by more advanced techniques will provide additional information on the composition of microplastics present in the Malebo Pool.

In the commune of Masina, as elsewhere in the democratic republic of Congo, the sector of rudology or the systematic study of waste has so far been little or badly known. Thus, technical studies and scientific research must be carried out to better understand this sector and spare the populations from various consequences linked to poor waste management. It is in this logic that is located this study which consists in making an inventory of fixtures on the management of the municipal waste with a view to possible improvement. At the end of the investigations, it appears overall that the solid household waste management system set up in the municipality of Masina is anti-ecological. This is explained by the combination of several variables, in particular: - the absence of a real policy of ecological development of the territory, of good governance and of environmental education/responsibilization of the population; - the ignorance and ecological incompetence of the municipal authorities (77%), the team in charge of waste collection (100%) and the inhabitants of the municipality of Masina (71,4%); - a multifaceted poverty (moral and materiel) and a negligence of the residents which lead them to live in insalubrity; - the use of unsuitable and non-ecological solid waste management methods and techniques (39%). Therefore, it seems urgent that producers of waste and decision-makers question themselves and make amends in order to assume themselves differently as consumer-pays and polluter-pays.