Etude De L'influence Des Parametres De Combustion Sur la Formation De S[O.Sub.2], De NO et De CO Lors De la Degradation Thermique De Produits Phytosanitaires D'usage Courant En Afrique De l'Ouest

By Bouda, Medard; Rogaume, Thomas et al. | Journal of Environmental Engineering and Science, May 2008 | Go to article overview

Etude De L'influence Des Parametres De Combustion Sur la Formation De S[O.Sub.2], De NO et De CO Lors De la Degradation Thermique De Produits Phytosanitaires D'usage Courant En Afrique De l'Ouest


Bouda, Medard, Rogaume, Thomas, Segda, B. Gerard, Sawadogo, Paul W., Koulidiati, Jean, Journal of Environmental Engineering and Science


Resume : Alors que nous sommes confrontes a une quantity de plus en plus importante de dechets industriels (notamment, les produits phytosanitaires), l'incineration est perrque comme une voie tres interessante pour leur elimination. Cependant, celle-ci peut se reveler generatrice de polluants, notamment d'oxydes d'azote (N[O.sub.x]), d'oxydes de soufre (S[O.sub.x]), de monoxyde de carbone (CO) et autres emissions gazeuses toxiques. Il importe donc d'optimiser le processus de combustion afro de reduire ces emissions. Des etudes menees lors de l'incineration de dechets phytosanitaires montrent de fortes correlations entre la formation de ces polluants et les parametres de combustion tels la concentration en oxygene, la temperature et le temps de sejour an ccour du reacteur. An cours de la presente etude, l'emphase a ete mise plus particulierement sur l'influence de ces parametres sur la production du monoxyde d'azote (NO), du CO et du dioxyde de soufre (S[O.sub.2]) lors de l'incineration du Cyperthion D et du Cyperthion O, les deux principaux produits phytosanitaires d'usage courant en Afrique de l'Ouest. Il en ressort que les emissions de NO et de S[O.sub.2] decroissent avec l'augmentation du temps de sejour mais augmentent avec la hausse de temperature et de concentration locale en oxygene an ccour du reacteur. A l'inverse, le CO augmente avec l'accroissement du temps de sejour mais diminue avec la hausse de temperature et de concentration locale en oxygene. A partir de cette etude a petite echelle, il est possible de deduire les conditions experimentales pour conduire des essais a grande echelle, en incinerateur rotatif, pour le traitement thermique des produits phytosanitaires perimes.

Mots-cles : dechets phytosanitaires, Cyperthion D, Cyperthion O, incineration, traitement thermique, parametres de combustion, emissions gazeuses, oxyde d'azote, dioxyde de soufre, monoxyde de carbone.

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 (N[O.sub.x]), sulfur oxides (S[O.sub.x]), 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 (S[O.sub.2]) 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 S[O.sub.2] 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.

Key words: phytosanitary wastes, Cyperthion D, Cyperthion O, incineration, thermal treatment, combustion parameters, gaseous emissions, nitrogen oxide, sulfur dioxide, carbon monoxide.

Introduction

Grace a la vulgarisation de l'emploi d'engrais et de pesticides dans les systemes agronomiques, une augmentation considerable des surfaces de production agricole et de la productivite a l'hectare ont ete possibles an niveau mondial. Ainsi, depuis les annees 1940, une gamme variee de pesticides a ete wise a la disposition des agriculteurs africains. …

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Etude De L'influence Des Parametres De Combustion Sur la Formation De S[O.Sub.2], De NO et De CO Lors De la Degradation Thermique De Produits Phytosanitaires D'usage Courant En Afrique De l'Ouest
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