A physicochemical-biotechnological approach for an integrated valorization of olive mill wastewater

► We developed an integrated process for the valorization of olive mill wastewater. ► Sixty percent of olive mill wastewaters polyphenols were recovered by solid phase extraction. ► An acidogenic packed bed reactor fed with dephenolized effluents was developed. ► More than 70% of the anaerobic effluent COD was due to VFAs. ► Molecular biology tools demonstrated the robustness of the developed process.