Influence of Ozone Application Methods on Efficacy of Ozone Decolorization of Pulp Mill Effluents

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Abstract
This study statistically examined the impacts of ozone application methods on the two representative types of pulp mill effluents. To facilitate statistical evaluation, the experiments were designed as paired block experimental series, and the pooled experimental errors in each block were used for t-test and ANOVA analysis. Two different ozone application modes were investigated using two specially designed ozone reactor systems. System I consisted of a two-phased reactor which introduced the total amount of ozone to the wastewater in single instance with proper mixing. System II provided ozone to wastewater at a desired rate by controlling the flow and concentration of the ozone/oxygen gas mixture in a once-through flow mode.