Evaluation of steelmaking slag as basal media for coastal primary producers
2015
Akiyama, Yoshihiro B. | Yano, Hitomi | Koba, Kyohei | Katayama, Takahiro | Asaoka, Satoshi | Okuda, Tetsuji | Nakai, Satoshi | Yamamoto, Tamiji | Nishijima, Wataru
The use of granular steelmaking slag as a substitute for natural sand in the construction of tidal flats was investigated. Using an intertidal flat simulator, we evaluated dephosphorization slag mixed with 8% by dry weight of dredged sediment (DPS+DS) as a basal medium for the growth of benthic macro- and microalgae in comparison with silica sand mixed with 8% dredged sediment (SS+DS). Species compositions of macro- and microalgae were distinctly different between DPS+DS and SS+DS. The mean dry weight of macroalgae on DPS+DS was three orders of magnitude higher than that on SS+DS. Sediment shear strength and pH were higher in DPS+DS than in SS+DS or in the sediment of natural tidal flats. These results suggest that DPS contributes to changing the sediment environment, thereby changing the algal composition compared to the composition on natural tidal flats.
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