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MAP (magnesium ammonium phosphate) precipitation through supersaturation restriction strategy for phosphorus recovery from an aqueous solution is presented in the study. The air-agitated column reactor was designed with three feed ports for the MAP solution entry, while the levels of the supersaturated solution at varying pH (8, 9 and 10) were examined at the different retention time. At pH 10, the recovery phosphorus efficiency decreased with an increase in the retention time, but increased gradually with an increase in the retention time under pH 10. Meanwhile, X-ray powder diffraction (XRPD) method proved that the high purity of struvite could be produced, while its morphology observed by scanning electron micrograph (SEM) was irregular prismatic with diverse crystal size. Obviously, the supersaturation restriction strategy may be applied for the increased phosphorus recovery efficiency through struvite formation in the reactor observed during the work.

THE EFFECT OF SUPERSATURATION CONTROL STRATEGY FOR PHOSPHATE RECOVERY THROUGH PRECIPITATION OF STRUVITE IN AN AIR-AGITATED COLUMN REACTOR