Forward osmosis (FO) technology has become increasingly attractive in the past decades for water related applications and will likely continue to develop rapidly in the future. FO is an osmotically driven membrane process in which water diffuses through a semi-permeable membrane under an osmotic pressure difference across the membrane. In the FO process, both concentration and dilution of a given stream can be performed by applying a more-concentrated or less-concentrated solution on the other side of the membrane. Compared to conventional pressure-driven membrane separation processes such as reverse osmosis (RO) and nanofiltration (NF), FO can operate at nearly zero hydraulic pressure. In this study, Polysulfone (PSf) and Polyethersulfone (PES) were synthesized via phase inversion-immersion precipitation method for application in pilot scale FO system. The FO performance of the prepared membranes was evaluated at room temperature with an effective membrane area of 42 cm².
Aquaporin-TFC FO membrane was used as a reference membrane. The system was circulated using two variable speed pumps (Hydra-Cell pump, 332212, U.S.) at a fixed flow rate of 0.1 L min-1. Concentrated NaCl solutions (0.5 M, 1 M and 2.0 M) were used as draw solutions while the feed solution contained distilled water. The change of draw solution concentration was measured by using conductivity meter (Lovibond Senso Direct, 150). All synthesized and commercial membranes were tested under FO mode where the active layer facing the feed solution. The system was maintained at least 30 minutes to reach stability and the data was collected every 30 minutes by digital weight balance. Results show in Figure 1 indicates that the commercial Aquaporin-TFC FO membrane shows the best performance with...
Session: M1 - New Membranes I
Day: 14 March 2018
Time: 09:00 - 10:15 h