Ozonation des acides fulviques aquatiques en tant que precurseurs de formation de composes organohalogenes: Effet du taux d'ozonation, des pièges a radicaux et du pH

Abstract

Abstract Chlorination has been carried out on six aquatic fulvic acids ozonated in different conditions. The chlorine reactivity of fulvic acids, such as chlorine demand, trihalomethane and total organic halide formation potentials, was determined. The effects on the chlorination of the presence of scavengers during ozonation, ozone dose and pH of ozonation have been investigated. In general, ozonation led to a degradation of chlorine reactivity of fulvic acids, with exception of chlorine demand after ozonation at neutral pH and in the absence of scavenger, which increased. It has been shown in all the cases that the presence of scavenger during ozonation allowed a larger degradation. A higher ozone dose is likely to degrade the chlorine reactivity at a greater extent. In addition, at acidic pH ozonation has been shown more efficient for the same aim than at neutral pH. The understanding of these results involved consideration of the occurrence of radical‐type reactions during ozonation of fulvic acids at...