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In this study, the effectiveness of a UV-A LEDs system, transition metal activators (Fe and Co) and different oxidants (hydrogen peroxide, H 2 O 2; peroxymonosulfate, PMS and persulfate, PS) were evaluated in the degradation of an elderberry wastewater. Several oxidation processes can be applied using the pointed out oxidants, UV radiation and transition metals, which can be classified as hydroxyl radical advanced oxidation processes (HR-AOPs) and sulfate radical advanced oxidation processes (SR-AOPS). The initial trials achieved 99% of TOC removal in UV-A LED/H 2 O 2 (with multi-step additions)/Fe 2+ and with PMS (single addition)/Co 2+ processes, which were afterwards optimized for metal activator dosage. The UV-A LED/H 2 O 2 (multi-step addition)/Fe 2+ process demonstrated a lower TOC removal when the Fe 2+ concentration was reduced (50 mg/L–99% removal and 25 mg/L only 75%). On the …