Seed selections for crystallization of calcium phosphate for phosphorus recovery.

Seed induces and promotes the crystallization of calcium phosphate, and acts as carrier of the recovered phosphorus (P). In order to select suitable seed for P recovery from wastewater, three seeds including Apatite (AP), Juraperle (JP) and phosphate-modified Juraperle (M-JP) were tested and compared. Batch and fixed-bed column experiments of seeded crystallization of calcium phosphate were undertaken by using synthetic wastewater with 10 mgP/L. It showed that AP had bad enduring property in the crystallization process, while JP had better performance for multiple uses, and M-JP was a hopeful seed for P recovery by crystallization of calcium phosphate.