Étude de l’influence des paramètres de combustion sur la formation de SO2, de NO et de CO lors de la dégradation thermique de produits phytosanitaires d’usage courant en Afrique de l’Ouest

Abstract

As we are faced with a constantly increasing quantity of industrial waste (namely, phytosanitary products), incineration is perceived as an interesting method for their disposal. Nevertheless, incineration can generate pollutants such as nitrogen oxides (NOx), sulfur oxides (SOx), carbon monoxide (CO), and other toxic gases. Therefore, it is important to optimize the combustion process to reduce these emissions. Studies performed during incineration of phytosanitary wastes show strong correlations between the generation of these pollutants and combustion parameters such as oxygen concentration, temperature, and residence time in the reactor core. In the present study, we focused more particularly on determining the influence of these parameters on the production of nitrogen monoxide (NO), CO, and sulfur dioxide (SO2) during the incineration of Cyperthion D and Cyperthion O, the two main phytosanitary products currently used in West Africa. The results showed that NO and SO2 emissions decrease with an increase in residence time, but increase with higher local oxygen concentrations and higher combustion temperatures in the reactor core. Inversely, CO emissions increase with an increase in residence time, but decrease with higher temperatures and higher local oxygen concentrations. This small-scale study allows us to derive the experimental conditions to pursue large-scale assays, in a rotatory incinerator, for the thermal processing of expired phytosanitary products.