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    Coupling reverse osmosis and osmotic distillation for clarified pomegranate juice concentration: Use of plasma modified reverse osmosis membranes for improved performance

    Year: 2019

    Journal: Innov. Food Sci. Emerg. Technol., Volume 52, MAR, page 213–220

    Authors: Bagci, Pelin Onsekizoglu; Akbas, Meryem; Gulec, Haci Ali; Bagci, Ufuk

    Organizations: Scientific and Technological Research Council of Turkey [TUBITAK] [11505911]; Fund of Scientific Research Projects of Trakya University [TUBAP] [2017/105]

    Keywords: Membrane; Osmotic evaporation; Surface modification; Vacuum plasma; Juice concentrate

    In this study, a low pressure nitrogen plasma (LPNP) activation was implemented to modify the surface characteristics of a commercial thin film composite (TFC) polyamide reverse osmosis (RO) membrane. The free energy of interaction (Delta G(iwi)) results showed that the hydrophobic nature of untreated TFC RO membrane became considerably hydrophilic with the effect of LPNP treatment. Among various plasma powers and exposure times tested, a general decreasing trend was observed for the water contact angle with increasing plasma duration, reaching a minimum of 13.2 +/- 0.8 degrees for 90 W at 15 min. A remarkable increase in water flux of the LPNP modified RO membrane was observed throughout the RO process, which promoted higher soluble solids content (SSC) values in the concentrated juice at the same period of time with the plain one. The higher SSC values achieved by the modified RO membrane enabled 30% time-saving during further osmotic distillation process.
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