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Osmotic distillation (OD) of apple and pomegranate juices was performed with membrane contactors. In the first part of the study, apple juice was concentrated through OD process using hollow fiber module. For feed-in-fiber flow set-up, final juice concentration of 47oBrix with a water permeate flux of 0.047 kg.m-2.hr-1, while for the feed-in-shell flow arrangement, final juice concentration of 52oBrix with a water permeate flux of 0.089 kg.m-2.hr-1 was achieved in a total time of 320 minutes. Fouling effect on the performance of polypropylene hollow fiber module was evaluated for pomegranate juice concentration through OD. A final concentration of 52.0°Brix with a water permeate flux of 0.186 kg.m-2.hr-1 was achieved in a total time of 310 minutes. Morphological analysis of the membrane surface and cross sections revealed that the significant pore blockage occurred due to fouling after persistent operation. However, it was found that rigorous membrane cleaning protocol, promoted higher water permeate flux. Pomegranate juice was also subjected to OD process using PVDF and PTFE membranes in flat sheet module. Wetting behavior of the membranes was evaluated through various analytical techniques. It was found that PVDF membrane had least resistance to wetting which resulted in a lower water permeate flux of 0.208 kg.m-2.hr-1 in a total time of 24 hours. On the other hand, a nice resistance to wetting was shown by PTFE membrane. A water permeate flux of 0.935 kg.m-2.hr-1 was achieved in an operational time of 24 hours. Therefore, PTFE membrane showed an ample potential for semiindustrial/industrial scale applications.
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