| 摘要 |
PURPOSE:To perform the exchange operation of a filter material and filtering operation in parallel while reducing equipment cost and an installation area, by using a filter tank having a filter layer packed with an ion exchange fiber in the removal of ionic impurities and insoluble impurities. CONSTITUTION:When filtering treatment is performed and a filter apparatus reaches predetermined differential pressure or the liquid quality of a treated liquid reaches a predetermined value, a partition valve is operated and a filter tank, to which a liquid to be treated is supplied at first from a liquid supply pipe 10, is successively altered to make it possible to perform the exchange operation of a filter material and filtering operation in parallel. In addition, by using a filter tank having mainly performed the removal of ionic impurities as a filter tank for mainly removing insoluble impurities, the ion exchange function of a filter layer 7' can be used thoroughly and effectively.
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