화학공학소재연구정보센터
Industrial & Engineering Chemistry Research, Vol.56, No.49, 14623-14632, 2017
Sustainable Water Reclamation from Different Feed Streams by Forward Osmosis Process Using Deep Eutectic Solvents as Reusable Draw Solution
A sustainable and low-cost reusable water recovery process from industrial wastewater may have potential positive impact toward the potable water crisis in several industrial processes. Quite a number, of approaches such as chemical processes, biological treatment, and high-pressure membrane based processes have been developed to address this crucial issue but most of them suffer from several discrepancies. Due to the suitability of deep eutectic solvents (DESs) as promising draw solution (DS) for forward osmosis (FO) processes, herein the potential of DESs for the recovery of reusable water from seawater, dye contaminated wastewater, and tannery wastewater by continuous FO process is demonstrated. Under optimized process conditions, >90% reusable water was recovered from different feed solutions with an average water flux of 5 L m(-2) h(-1) Due to the high freezing point (T-f) difference between water and DES, phase separation of the DES and water mixture obtained at the end of the process was achieved at a temperature ca. -5 degrees C, and DSs thus recovered were reused in subsequent batch experiments (three cycles), where minimal loss of water flux was observed. The recovered water was found to have low contamination making it suitable for different purposes.