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Membrane Water Treatment Volume 13, Number 2, March 2022 , pages 63-72 DOI: https://doi.org/10.12989/mwt.2022.13.2.063 |
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Choline chloride-Glycerol (1:2 mol) as draw solution in forward osmosis for dewatering purpose |
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Supritam Dutta, Pragnesh Dave and Kaushik Nath
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| Abstract | ||
| Choline chloride-glycerol (1:2 mol), a natural deep eutectic solvent (NADES) is examined as a draw solution in forward osmosis (FO) for dewatering application. The NADES is easy to prepare, low in toxicity and environmentally benign. A polyamide thin film composite membrane was used. Characterization of the membrane confirmed porous membrane structure with good hydrophilicity and a low structural parameter (722 µm) suitable for FO application. A dilute solution of 20% (v/v) NADES was enough to generate moderate water flux (14.98 L m-2h-1) with relatively low reverse solute flux (0.125 g m-2h-1) with deionized water feed. Application in dewatering industrial wastewater feed showed reasonably good water flux (11.9 L m-2h-1) which could be maintained by controlling the external concentration polarization and fouling/scaling mitigation via simple periodic deionized water wash. In another application, clarified sugarcane juice could be successfully concentrated. Recovery of the draw solute was accomplished easily by chilling utilizing thermo responsive phase transition property of NADES. This study established that low concentration NADES can be a viable alternative as a draw solute for dewatering of wastewater and other heat sensitive applications along with a simple recovery process. | ||
| Key Words | ||
| forward osmosis; flux; ionic liquid; membrane; wastewater | ||
| Address | ||
| Supritam Dutta: Department of Chemical Engineering, L. D. College of Engineering, Ahmedabad 380015, Gujarat, India Pragnesh Dave: Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar 388 120, Gujarat, India Kaushik Nath: Department of Chemical Engineering, G. H. Patel College of Engineering & Technology, Vallabh Vidyanagar 388 120, Gujarat, India | ||
