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The most important scientific and technical challenges that humanity is facing in the 21st century do not concern only the supply of secure, clean, sustainable energy, but also wastewater remediation for re-use purpose.Water, one of the worlds most valuable resources, is under constant threat due to climate changes and resulting drought.On the other hand, the explosive population growth significantly increases fresh water demand for industrial and domestic activities.In this scenario, the development of technologies for the treatment of wastewater and recycling becomes absolutely mandatory.