| 摘要 |
PROBLEM TO BE SOLVED: To provide a treating method of effectively making incineration residual ash harmless in a cooling process usually performed without reprocessing of the incineration residual ash being needed as in a conventional method and also to provide a treating agent for making harmless which is solidified so that it is gradually eluted into cooling water in such treating method of making harmless. SOLUTION: When cooling incineration residual ash generated on trash incineration by cooling water, as the cooling water, that containing a treating agent for making heavy metals insoluble in water is used to make heavy metals insoluble in water simultaneously with cooling. In this way, the incineration residual ash is made harmless. The treating agent for making harmless is that used, contained in water added to the incineration residual ash and/or incineration fly ash generated on trash incineration, and is that which a material consisting essentially of hydrous or anhydrous phosphate is solidified by melting and cooling to form, and is that which anhydrous phosphate or phosphate enable to be hydrous is solidified as hydrous salt by adding water and coagulating it to form. |
