Sediment Environment of an Artificial Tidal Flat Constructed Using Carbonated Decarburization Slag and Dredged Soil

YANO Hitomi, NAKAI Satoshi, OKUDA Tetsuji, NISHIJIMA Wataru

doi:10.11353/sesj.28.405

Steelmaking slags such as decarburization slag have attracted attention as new materials for construction of tidal flats and seagrass beds; however, the materials may release alkalines, which results in increase of soil hardness. In addition, the materials are lack of fine particles and organic compounds important for development of a benthic community. In this study, we attempted to reduce release of alkalines and elevation of soil hardness by decarburization slag by a combination of slag-carbonation using CO₂ and addition of dredged soil. In addition, an artificial tidal flat was constructed in an intertidal zone simulator using the carbonated decarburization slag to which dredged soil was added for investigation of the developed macrobenthos community. By this combined treatment, the release of alkalines and elevation of soil hardness /was inhibited. The pH value of the interstitial water at 1 cm depth in the artificial tidal flat was maintained at about 9.5, and its soil hardness was in the range from 7 mm to 15 mm. Furthermore, the number of macrobenthos inoculated into the artificial tidal flat was maintained during the experimental period, thereby indicating that the mixture of carbonated decarburization slag and dredged soil may have capability of producing macrobenthos habitat.

Sediment Environment of an Artificial Tidal Flat Constructed Using Carbonated Decarburization Slag and Dredged Soil

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