| 摘要 |
<p>PROBLEM TO BE SOLVED: To seal dioxins and heavy metals in waste ash effectively. SOLUTION: A mixture comprising materials ejected from a volcano such as natural black clay and volcanic ash and waste ash is solidified with cement. Since humus colloid in the natural black clay is charged negatively, the cations of heavy metals, or the like, in a block body are adsorbed/held on/with collodial particles. Allophane is amphoteric colloid and adsorbs/holds cations and anions, porous volcanic pebbles, volcanic sand, and volcanic ash adsorb/hold harmful substances such as dioxins and PCB in their pores, and since the harmful substances are sealed by cement, the substances are confined strongly to be prevented form being diffused outside.</p> |
