Development of a novel system for the phosphorous removal and recovery using hydrotalcite like compounds

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Commercial hydrotalcite calcined at 500℃ showed maximum phosphorous removal ratio. On the other hand, hydrotalcite vibro-milled for 6hrs under a dry condition showed maximum removal ratio of phosphorous on heating at 250℃. Consolidated bodies with high phosphorous removal and recovery efficiencies were obtained by carbonation of wet powder mixture of hydrotalcite and wollastonite at 80℃ for 3hrs under 0.4MPa CO_2 pressure followed by calcination at 500℃. These consolidated bodies showed enough durability against repeated phosphorous removal, ion exchange and heat treatment.