| 摘要 |
<p>A solution contained in a regeneration tower (1008) is supplied to a filtering unit (15). The filter unit filters out solid particles contained in the solution. A washing unit (V 13 , 15) washes out with backwash water solid particles filtered out by the filter unit. An evaporating unit (16A, 16B) receives the backwash water containing the solid particles, and heats received backwash water thereby obtaining solid-particles concentrated backwash water.</p> |
