| 摘要 |
PROBLEM TO BE SOLVED: To provide an arsenic removal method which enables the efficient removal of arsenic from service water or wastewater containing a thin concentration of arsenic of≤10 ppm. SOLUTION: When arsenic is removed from the service water or wastewater containing a thin concentration of arsenic (arsenic-containing water), a sulfidizing agent comprising one or more kinds among hydrogen sulfide, sodium sulfide, and sodium hydrosulfide is added to the arsenic-containing water, and then the mixture is brought into contact with a contact material to perform solid-liquid separation while converting arsenic to solid arsenic sulfide. The arsenic-containing water to which the sulfidizing agent has been added is brought into contact with the contact material in the presence of solid sulfide or sulfur, which can improve treatment efficiency. COPYRIGHT: (C)2005,JPO&NCIPI
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