| 摘要 |
PURPOSE:To reduce the generation of cracks in the powdery ion exchange resin bed formed on an element, by setting the shrinking degree of a powdery ion exchange resin aggregate due to the adsorption of a suspended substance to 0.8 or more. CONSTITUTION:In performing precoat filtering using an aggregate formed by mixing a powdery cation exchange resin and a powdery anion exchange resin as a filter aid, a value obtained by dividing the shrinking degree of the aggregate due to the adsorption of a suspended substance, that is, the volume of the aggregate having adsorbed the suspended substance by the volume of the aggregate adsorbing nothing is set to 0.8 or more. As a result, the shrinkage of the aggregate relating to the generation of cracks is prevented and the reliability of the powdery ion exchange resin at the time of filtering can be enhanced.
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