Effect of water composition on organic micropollutant removal by ozonation. Part I. Specific consumption of ozone in a reactor

From the numerous reactions between ozone and other components of raw water in a drinking water plant, we obtain theoretical equations for hydroxy radical concentrations and for the disappearance of ozone. Dissolved organic matter is divided in to four components: substances which react with ozone by a direct mechanism, initiators, promotors, and scavengers of radical reactions. We also take into account the reactions between hydrogen peroxide, ozone, and free radicals to simulate advanced oxidation processes. For 56 natural water samples, we measured the disappearance of ozone directly in a completely stirred batch reactor. Water samples were characterized by pH, TOC, 254 nm UV absorbance and alkalinity.