Abstract
Pulp mill effluent was treated by different advanced oxidation processes (AOPs) consisting of UV, UV/H 2O 2, TiO 2-assisted photo-catalysis (UV/TiO 2) and UV/H 2O 2/TiO 2 in lab-scale reactors for total organic carbon (TOC) and toxicity removals. Effects of some operating parameters such as the initial pH, oxidant and catalyst concentrations on TOC and toxicity removals were investigated. Almost every method resulted in some degree of TOC and toxicity removal from the pulp mill effluent. However, the TiO 2-assisted photo-catalysis (UV/TiO 2) resulted in the highest TOC and toxicity removals under alkaline conditions when compared with the other AOPs tested. Approximately, 79.6% TOC and 94% toxicity removals were obtained by the TiO 2-assisted photo-catalysis (UV/TiO 2) with a titanium dioxide concentration of 0.75 g l −1 at pH 11 within 60 min.
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