| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid separator and a liquid separating method by which, a high recovery ratio can be realized while deterioration of membrane performance due to silica scale is prevented. SOLUTION: A scale preventing treatment device 8 for removing or preventing scale components is provided on the upstream side of reverse osmosis modules of plural stages 3a, 3b, 3c. A flocculation type filter having an adsorbent 11 having action for flocculating silica in original liquid and a filter medium 12 for catching flocculated silica lumps is provided on the upstream side the scale preventing treatment device 8. In the flocculation type filter 13, since silica in the raw liquid is flocculated to turn it into silica lumps and remove them, silica concentration in concentrated water does not become higher. In this way, the deposit of silica scale on the membrane surfaces of the reverse osmosis modules 3a, 3b, 3c is restrained to cause no deterioration of membrane performance.
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