PROBLEM TO BE SOLVED: To provide a system of concentrating a solution which is altered and denatured by heating at high temperature like a food related solution such as fruit juice, liquid sugar, and honey without alternation and denaturation.SOLUTION: A concentration system 1 of a liquid to be treated W includes a reverse osmosis membrane device 3 as primary concentration means and a membrane distillation device 4 as secondary concentration means in the middle of a raw water line 2. A heat exchanger 5 is arranged between the reverse osmosis membrane device 3 and the membrane distillation device 4. In the concentration system 1, the liquid to be treated W is primary-concentrated at the reverse osmosis membrane device 3 and is separated into a primary-concentrated liquid W1 and a membrane permeable water W2. The primary-concentrated liquid W1 is secondary-concentrated at the membrane distillation device 4 and is separated into a secondary-concentrated liquid W3 as a final product and a distilled water W4.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】 果汁、液糖、蜂蜜などの食品関連溶液のように高温での加熱により変質や変性をきたす溶液を変質や変性させることなく濃縮するシステムを提供する。【解決手段】 被処理液Wの濃縮システム1は、原水ライン2の途中に一次濃縮手段としての逆浸透膜装置3と二次濃縮手段としての膜蒸留装置4とを有し、逆浸透膜装置3と膜蒸留装置4との間には熱交換器5が配置されている。上記濃縮システム1において、被処理液Wは逆浸透膜装置3で一次濃縮されて一次濃縮液W1と膜透過水W2とに分離され、一次濃縮液W1が膜蒸留装置4で二次濃縮されて最終生成物である二次濃縮液W3と蒸留水W4とに分離される。【選択図】 図1
