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Forward osmosis (FO) has emerged as a new membrane-based technology for concentration of wastewater with electrical energy consumption significantly lower than that of reverse osmosis (RO). However, most of current draw solutes in FO are difficult to be recycled efficiently. In this research, volume reduction of two sources of industrial wastewater, resin regeneration wastewater and ammonium containing wastewater from a Taiwanese technology company was processed by using a thermally responsive ionic liquid, [P4444][hydrogen maleate], and a traditional inorganic salt with UCST (upper critical solution temperature)-like behavior, sodium sulfate as FO draw solutes. The thermally stimulated phase separation process can reduce the energy for draw solution regeneration. Resin regeneration wastewater and ammonium containing wastewater was concentrated to 10x and 4.8x respectively using Na₂SO₄ as draw solution. When using [P4444][Mal] as draw solution, resin regeneration wastewater and ammonium containing wastewater was concentrated to 2.2x and 1.7x with low reverse salt flux.

Author：王鈞逸、劉柏逸、何佳樺、林冠佑、楊翠容、黃盟舜、梁德明、洪仁陽

★Article source：International Conference on Desalination using Membrane Technology