Method of recovering salt

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PROBLEM TO BE SOLVED : To provide a recovery method of a byproduct salt capable of efficiently recovering a crystal salt of high quality. SOLUTION : The recovery method of the byproduct salt includes a raw liquid storage step for storing a liquid to be treated containing a salt component in a raw liquid receiving tank, a pretreatment step for applying membrane treatment and oxidation treatment to the liquid to be treated supplied from the raw liquid receiving tank, a first salt component separation step for separating the salt component contained in the liquid to be treated by repeatedly performing the crystallization and solid-liquid separation of the liquid to be treated after pretreatment, a blow liquid storage step for discharging a part of the liquid to be treated during the repetition of crystallization and solid-liquid separation as a blow liquid, a re-oxidation treatment step for again subjecting the blow liquid to oxidation treatment and a second salt component separation step for separating the salt component contained in the blow liquid by performing the crystallization and solid-liquid separation of the blow liquid. COPYRIGHT : (C)2008, JPO&INPIT