環境資源工学
Online ISSN : 1349-9262
Print ISSN : 1348-6012
ISSN-L : 1348-6012
論説報文
カドミウム含有廃液のフェライト化処理によって生成する スラッジの改質
日比野 剛来田村 實信本田 由治
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ジャーナル フリー

2006 年 53 巻 3 号 p. 107-115

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Leached test was used to evaluate the safety of the ferrite sludge formed by the heat treatment after conventional or two-step treatment with pH adjustment of wastewater. Simultaneously, the concentrations of Cd and Fe ions in the treated water were measured before the leached test. The effect of the heat treatment on the concentrations of Cd (CCd) and Fe (CFe) in the elute was discussed by comparing the ferrite sludge formed without heat treatment.
The CCd of ferrite sludge formed by the heat treatment with the two-step treatment was remarkably lower than that by conventional or two-step treatments in relation to Cd(OH)2 on the surface of ferrite particles. XPS measurement of the sludge formed by conventional and two-step treatments indicated the existence of Cd(OH)2 on the surface of ferrite particles. XPS measurement of the sludge formed by the heat treatment indicated no existence of Cd(OH)2 on the surface of ferrite particles. The measurement after Xe+ sputtering showed that the Cd(OH)2 is absent not only on the surface but also in the bulk of the particles formed by heat treatment.
The heat treatment after two-step treatment stabilizes the sludge and is favorable for steady operation of the ferrite process, industrial utilization of the sludge and good quality of the treated water.

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© 2006 環境資源工学会
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