The main goal of this work is to evaluate the usage of ozone (O) as a pre-treatment or simultaneously combined with UVC/HO process for the polishing stage treatment of real bio-treated slaughterhouse wastewater. Two different treatment strategies were tested: i) pre-ozonation of the wastewater followed by an UVC/HO process (two-step treatment); ii) simultaneous application of O/UVC/HO combined process (one-step treatment). For the two-step strategy, the pre-treatment with 30 mg O/min for 10 min reduces significantly total suspended solids (TSS), turbidity and colour, reducing light filtering effects and increasing the efficiency of the following UVC/HO process. In turn, the one-step treatment strategy (O/UVC/HO) allows a more efficient use of injected O by reducing the amount of O required (from 273 to 189 mg O/L) to achieve similar mineralization levels. The real bio-treated slaughterhouse wastewater treated by O/UVC/HO process achieved final colour values of 20 Pt/Co, TSS of 35 mg/L and COD of 61 mg O/L, allowing its direct discharge into water compartments according to European Council Directive 91/271/EEC.
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