| 摘要 |
PROBLEM TO BE SOLVED: To provide an effective and inexpensive method for removing arsenic contained in water to be treated using inexpensive iron powder of high density manufactured by an atomizing method or the like. SOLUTION: Air is blown into water A to be treated containing arsenic in an aeration tank 1 to heighten a dissolved oxygen concentration in the treating object water A to 2.0-8.0 mg/L, then the air-blown water A1 to be treated is passed through an arsenic adsorbing column 2 provided with an iron powder-packed column. Thus, oxidation of iron powder surfaces is promoted when adsorbing arsenic to oxidize arsenic present in the water A to be treated in a form of trivalent arsenous acid ions to a form of pentavalent arsenic acid ions in advance, to promote adsorption of arsenic to iron oxide or hydroxide produced on the surfaces of iron powder, and to efficiently remove arsenic. COPYRIGHT: (C)2008,JPO&INPIT
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