Phosphorus mineralization for resource recovery from wastewater using hydrothermal treatment(<Feature>Aqueous Solution Science for Ceramic Processing II)

概要

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We investigated the resource recovery of phosphorus from aqueous media containing various inorganic phosphorus compounds by hydrothermal mineralization treatment. The hydrothermal treatment was carried out for the model wastewaters containing 2000mg/dm^3 of phosphorus in forms of P^VO_4^<3->, P^<III>O_3^<3->, P^IO_2^<3-> or a mixed aqueous solution of P^<III>O_3^<3-> and P^IO_2^<3-> with mineralizer Ca(OH)_2. The phosphorus concentration in the treated water, which contained P^VO_4^<3->, was less than 0.1mg/dm^3. On the other hand, the hydrothermal mineralization treatments with solid-liquid separation under hydrothermal conditions were required for the treatment of P^<III>O_3^<3-> and P^IO_2^<3->, in order to accomplish the national effluent standard of Japan (16mg/dm^3). In this case, the phosphorus concentration in the solution treated under the optimal conditions was 0.20mg/dm^3. Thus, the hydrothermal mineralization with Ca(OH)_2 is recommended as one of the detoxification and recovery techniques of phosphorus in aqueous solution.
社団法人日本セラミックス協会の論文
2009-03-01