A phosphorus recovery system based on a crystallization method and consisting of a phosphorus strip tank, a solid-liquid separation tank and a crystallization unit was operated continuously for a long time. The recovery percentage observed was approximately 75% under conditions
of 1 hr of contact time at each stage, 50 mg/L of calcium addition at each stage, a pH level of 7.5 to 7.8 in the first stage and a pH level of 8.0 to 8.3 in the second stage. The resulting phosphorus-coated seed crystal is reusable as fertilizer after simple drying.
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