| 摘要 |
PROBLEM TO BE SOLVED: To provide an iron/manganese removing filter medium which has a low specific gravity and excellent iron/manganese removing capacities, can remove chromaticity, turbidity, humins, arsenic, etc., and exhibit oxidation catalyst capacity for a long time. SOLUTION: As a thin layer of crystalline manganese dioxide that has higher bond strength to a porous material than hydrated manganese dioxide having an amorphous structure is stuck to the porous material having a large specific surface area and a low specific gravity, when water is filtered by the filter material, a contact area between the water and the manganese dioxide can be increased, and the oxidation catalytic action of the crystalline manganese dioxide firmly stuck to the porous material can be exhibited sufficiently. As the thin layer of the manganese dioxide is stuck onto the surface and whole inner peripheral surface of the porous material, iron and manganese can be removed with high efficiency for a long time. COPYRIGHT: (C)2004,JPO
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