| 摘要 |
PROBLEM TO BE SOLVED: To provide means capable of producing fresh water at a low cost by desalting salt water having a high salt concentration with small energy.SOLUTION: A water treatment method and apparatus includes: a salt precipitation step of adding a poor solvent to an aqueous solution containing salts to precipitate the salts dissolved in the aqueous solution; a solid-liquid separation step of solid-liquid separating the aqueous solution containing the precipitated salts obtained in the salt precipitation step to recover salt concentrated slurry and low salt concentration separated water; a solvent recovery step of recovering the poor solvent from the low salt concentration separated water; and a reverse osmosis membrane treatment step of performing reverse osmosis membrane treatment of the low salt concentration separated water after the solvent recovery to produce fresh water and membrane-separated water. |
