Abstract
The degradation, by several advanced oxidation reactions, of a pulp mill ECF bleaching effluent, was studied. The initial biodegradability of the organic matter present in the effluent, estimated as the BOD 5/COD, was low (0.3). When the effluent was submitted to ozonation and to five different advanced oxidation systems (O 3/UV, O 3/UV/ZnO, O 3/UV/TiO 2, O 2/UV/ZnO, O 2/UV/TiO 2), the biodegradability increase significantly. After five minutes of reaction, the O 3/UV system appears as the most efficient in to transform the organic matter to more biodegradable forms. A similar effect was observed when the effluent was submitted to an activated sludge treatment. The COD, TOC and toxicity reduction correlated well with the biodegradability enhancement after AOPs treatments.
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