To obtain a purification agent which efficiently, continuously and economically decomposes aliphatic organic halogen compounds or aromatic organic halogen compounds included in soil or ground water.
The method of producing the iron composite particle powder containing 30-99 wt.% α-Fe and 3,500-10,000 ppm S for purifying soil/ground water contaminated with organic halogen compounds is to prepare iron powder particles by heating and reducing geothite powder particles having 0.05-0.50 μm average longitudinal diameter and containing 2,200-6,300 ppm S or hematite powder particles having 0.05-0.50 μm average longitudinal diameter and containing 2,400-7,000 ppm S at temperature of 350-600°C, cool the iron powder particles, take out the iron powder particles into water without forming a surface oxide skin in the air phase and subsequently form the surface oxide skin on the surface of the iron powder particles and dry the same.
COPYRIGHT: (C)2004,JPO
Junno Kono
Masayuki Uegami
Tomoko Okita
Kenji Okinaka
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