Abstract
In order to produce highly concentrated fruit juice, a pilot scale membrane system was developed by combining reverse osmosis units with another unit with loose reverse osmosis membrane (nanofiltration membrane). This system could concentrate apple juice up to 46.5% sugar concentration. The efficiency of the system was analyzed with a model derived from concentration polarization equation and membrane transport equation, and validity of the model was demonstrated. Then, based on the model, an industrial-scale process was designed.
