Abstract
Phosphate is nutrients for organism. Therefore, chemical fertilizer containing phosphate can significantly increases food productions. However, dissolved phosphate due to the fertilizer leads to eutrophication in hydrosphere environment and has much effect on ecological system in lakes. For that reason, it is necessity to remove the dissolved phosphate to avoid lake eutrophication.Recovery of phosphates and reusing them as chemical fertilizer attracts attention in the world, because they can become brake-through for both the resource and environment problems (Kuroda .2005).
Monohydrocalcite (CaCO3•H2O; MHC) has been known as a metastable phase of calcium carbonate minerals. It is rare mineral and has been found in saline lakes or seawater environment. It has been known that metastable phase has larger specific surface area and more reactive than stable phase (Fukushi and Sato, 2005). Because MHC is a metastable phase, it is expected that MHC is more efficiency for dissolved species uptake than calcite and aragonite. The object of this study is to investigate the uptake behavior of phosphate by MHC.
