| 摘要 |
PURPOSE:To prevent the lowering in activity, by applying purifying treatment to a colored org. impurity-containing aqueous solution by using a regenerating and purifying treatment agent containing at least 5wt% of activated carbon. CONSTITUTION:A mixture consisting of a magnesia adsorbent obtained by baking a magnesium compound and a filler (e.g., perllite, zeolite or kaolin) is added to and mixed with a colored org. impurity-containing aqueous solution. After purifying treatment, solid-liquid separation is performed to obtain a purifying treatment agent having adsorbed colored org. impurities. This purifying treatment agent is baked at 400-600 deg.C under an oxygen concn. condition of 0.5-5% to be regenerated. This regenerated treatment agent and activated carbon are added to a stock aqueous solution to be treated and a replenishing magnesium adsorbent is further added to and mixed with said aqueous solution in the amount corresponding to the loss amount of the adsorbent eluted as a magnesium ion. The addition amount of activated carbon is set to a range of 5-60wt%.
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