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Marco De Carluccio, Raffaella Sabatino, Giulia Borgomaneiro, Andrea Di Cesare +1
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In this work, the effect of the electro-assisted Fenton (EAF) process on the bacterial community of a moving bed biofilm reactor (MBBR) for olive mill wastewater (OMW) co-treatment with urban wastewater (UWW) was investigated. According to metagenomic analysis, pre-treatment by EAF, while removing total phenols (TPHs) up to 84 % ± 3 % and improving biodegradability of OMW from 0.38 to 0.62, led to the emergence of bacterial genera in the MBBR (R2) that were not detected under conditions without pre-treatment (R1). Indeed, in that condition, Candidatus Competibacter replaced Amaricoccus as dominant denitrifying bacteria. In both cases, the bacterial community composition matched with high simultaneous nitrification-denitrification efficiency (up to 98 %). Finally, Chlorobium (2.5-4.1 %), sulphate-reducing bacteria and Geobacter (up to 1.6 ± 0.4 %), anaerobic bacteria that utilise iron oxides, were observed exclusively with EAF application, suggesting potential for the development of new integrated microbial electrochemical systems.