| 摘要 |
A method of treating an acidic wastewater containing sulfate ions and iron ions, especially a wastewater from a pit; and a solid wastewater-treating material for use in the method. The wastewater-treating material is obtained by solidifying a mixture of rock wool with an inorganic binder comprising as major components one or more of the silicates, hydroxides, and oxides of alkaline earth metals and alkali metals and has a void content of 50 % or higher. When this wastewater-treating material is brought into contact with an acidic wastewater containing iron ions or sulfate ions, not only the wastewater can be neutralized but iron and harmful heavy metals such as arsenic can be removed therefrom. After use, the wastewater-treating materia l can be easily treated.
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