| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently remove a predetermined target component from water to be treated at the time of removal of the predetermined target component by crystallization, to obtain treated water of which the concentration of SS is suppressed low and to more enhance the recovery of the target component from water to be treated. SOLUTION: Fine particles, which flow out of a reaction tank for crystallizing the target component to be removed in water to be treated, are subjected to solid-liquid separation and the target component is dissolved from the fine particles subjected to solid-liquid separation to be again sent to the reaction tank and the target component is removed from water to be treated while the target component contained in the fine particles is re-crystallized.
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