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Vol.4 , No. 3, Publication Date: Aug. 29, 2017, Page: 20-29
 with varying amounts of 2-acrylamido-2-methylpropanesulfonicacid (AMPS). Synthesized copolymers were mixed with alumina powder and then the osmotic pressure of the slurry mixtures was measured. The water flux of the mixed slurry in forward osmosis was also measured repeatedly. Subsequently, the water that had been sucked into the slurry was separated by gravitational settling of the alumina powder and copolymers. It was found that the osmotic pressure and water flux in forward osmosis increased with an increase in the ratio of AMPS to copolymer because the ionic concentration of the mixed slurry increased. It was also demonstrated that these temperature-responsive slurries could be used repeatedly, maintaining the water flux in forward osmosis, because the almost all temperature responsive polymers were completely separated from the diluted draw solution together with the alumina powder. In addition the water recovery ratio from the diluted draw solution became larger when using the temperature responsive slurry as draw solution compared when using the temperature responsive polymer solution as draw solution, because the alumina powder in the temperature responsive slurry enhance the polymers’ settling, forming the closely packed sediment of the polymer and powder.&picture=http://www.aascit.org/aascit/decorators/img/journal/924.jpg)
| [1] | Takamasa Mori, Department of Chemical Science and Technology, Faculty of Bioscience and Applied Chemistry, Hosei University, Koganei, Tokyo, Japan; Hosei University Research Institute for Slurry Engineering, Koganei, Tokyo, Japan. |
| [2] | Shyogo Sase, Department of Chemical Science and Technology, Faculty of Bioscience and Applied Chemistry, Hosei University, Koganei, Tokyo, Japan. |
| [3] | Kenta Kitamura, Department of Chemical Science and Technology, Faculty of Bioscience and Applied Chemistry, Hosei University, Koganei, Tokyo, Japan. |
Forward osmosis has emerged as a method for desalination. The development of the efficient forward osmosis process strongly depends on the development of a high performance draw solution. In this study temperature-responsive slurries, consisting of a mixture of temperature-responsive polymer and inorganic powder, were evaluated as draw solutions for the process of forward osmosis. Various copolymers were synthesized via copolymerization of N-isopropylacrylamide (NIPAM) with varying amounts of 2-acrylamido-2-methylpropanesulfonicacid (AMPS). Synthesized copolymers were mixed with alumina powder and then the osmotic pressure of the slurry mixtures was measured. The water flux of the mixed slurry in forward osmosis was also measured repeatedly. Subsequently, the water that had been sucked into the slurry was separated by gravitational settling of the alumina powder and copolymers. It was found that the osmotic pressure and water flux in forward osmosis increased with an increase in the ratio of AMPS to copolymer because the ionic concentration of the mixed slurry increased. It was also demonstrated that these temperature-responsive slurries could be used repeatedly, maintaining the water flux in forward osmosis, because the almost all temperature responsive polymers were completely separated from the diluted draw solution together with the alumina powder. In addition the water recovery ratio from the diluted draw solution became larger when using the temperature responsive slurry as draw solution compared when using the temperature responsive polymer solution as draw solution, because the alumina powder in the temperature responsive slurry enhance the polymers’ settling, forming the closely packed sediment of the polymer and powder.
Keywords
Forward Osmosis, Draw Solution, Temperature-Responsive Polymer, Temperature-Responsive Slurry, Gravitational Settling
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