CARACTERISATION PHYSICO-CHIMIQUE ET MICROBIOLOGIQUE DES BOUES DE VIDANGE DESHYDRATEES ET DES DECHETS SOLIDES MENAGERS ORGANIQUES POUR UNE VALORISATION EN COMPOST AGRICOLE

Abstract

In the city of Ouagadougou in Burkina Faso, faecal sludge treatment plants suffer from the lack of a process for recovering sludge after drying. Forsolid household waste, the quantities collected are mainly intended fortechnical landfill. Finding a solution for the recovery of Dewatered Faecal Sludge (DFS) and Organic Household Solid Waste (OHSW) is necessary in order to complete the faecal sludge management and solid waste management sectors. Our work aims to make a physico-chemical, microbiological and eco-toxicological study of a compost based on DFS and OHSW in order to propose a methodological approach for the sustainable production of hygienic compost. This article discusses the first step of our research, which consisted in characterizing the DFS at the Zagtouli treatment station as well as the OHSW of waste treatment and recovery center of Ouagadougou in order to identify a suitable recovery channel. To do so, a representative sample was taken from the Zagtouli DFS heap for laboratory analysis. The OHSW sample was obtained from household garbage bins from pre-collection centers in the city of Ouagadougou. The raw characteristics of DFS and OHSW (organic matter, nitrogen, pH, etc.) and their value in mineral elements (calcium, magnesium, potassium, phosphorus) show that these substrates would be ideal for the production of quality compost.