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The activation of peroxymonosulfate (PMS) to generate radical oxygen species (ROS) for in situ chemical oxidation has been shown to be an efficient technology for polishing micropollutants in wastewater effluent. Thus, it is also of great importance to develop environmental-friendly catalysts for PMS activation. The present study employed suspended biogenic manganese oxides (BioMnOx) to activate PMS for the efficient micropollutant removal. In a feasibility test, relatively high removal efficiencies (>80 %) of 14 selected micropollutants were obtained over short reaction times (20 min), in particular for refractory micropollutants such as carbamazepine (98 %), diclofenac (100 %) and metoprolol (81 %). The inhibition effect of coexisting anions to PMS activation was also investigated, which showed that the addition of HCO₃^– inhibited this process, while the addition of Cl^– showed negligible effect. Based on radical …