廃棄物資源循環学会研究発表会講演集
The 25rd Annual Conference of Japan Society of Material Cycles and Waste Management
セッションID: FA-4
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FA 3R/Waste management
Behavior of trace metals derived from slags with humic acid to marine algae
*Masashi OginoMio OkadaMasashi TakemuraChika KosugiToshiaki KatoTeruya MakiHiroshi Hasegawa
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会議録・要旨集 フリー

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Steel making slags are produced as a byproduct from the pyrometallurgical processing of iron requirement. Steelmaking slags consist mainly of calcium, silica, iron, aluminium and magnesium, and these are utilized for regeneration of sea desertification in coastal area with humic substances because iron is necessary for algal growth. However, these may contain some hazardous trace metals, and a risk assessment by culture experiments with leaching and bioconcentration testing is necessary prior to the practical use of steelmaking slags to coastal areas. In this study, we examined the effect of leachate elements from the slags with humic substances on the growth of algae. We also evaluated behavior of leachate elements from the slags and bioaccumulation in the algal cells. Addition of steelmaking slags(containing 17% of T-Fe) with humic substances as a fertilizer enhanced the growth of microalgae. The concentrations of Al, Mn, and Pb in the algal cells were higher than those in the culture media, although they are almost the same levels as those in the control. The hazardous metals such as Cr, Pb and Cd, regulated under the environmental legislation, were below the standards and/or under detection limits.
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© 2014 Japan Society of Material Cycles and Waste Management
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