Hydroxytyrosol recovery from olive pomace: a simple process using olive mill industrial equipment and membrane technology

Abstract In this work, pilot-scale nanofiltration was used to obtain aqueous solutions rich in hydroxytyrosol and tyrosol from olive oil by-products. A large-scale simple process involving mill standard machinery (blender decanter) for the pomace pre-treatment with water. The extract then directly fed a unit concentrated by reverse osmosis. Final concentration factors ranged between 7 9 4 tyrosol. final solution, obtained as retentate stream of osmosis, highly their concentrations remained stable over at least 14 months.