Phosphate Removal and Recovery with Seed Crystals in Low Concentrated Phosphate Wastewater
The phosphate removal and recovery from lower concentrated phosphate wastewater with the quartz sand, ceramsite, blast furnace slag and steel slag as seed crystals were investigated. The results showed that the steel slag performed a better phosphate removal performance than the other threes. The phosphate crystallization occurred under the reaction conditions of Ca/P 2.0, pH 9.0, phosphate concentration 10 mg/L and reaction time 12h. The steel slag could be employed as an effective seed crystal, of which the phosphate concentration decreased drastically in 12h and almost had been removed completely in 48h. The XRD analysis showed that the main crystallization products were hydroxyapatite (HAP) and the crystallinity increased with the reaction time.
Hui Li, Yan Feng Liu, Ming Guo, Rui Zhang and Jing Du
L. P. Qiu et al., "Phosphate Removal and Recovery with Seed Crystals in Low Concentrated Phosphate Wastewater", Advanced Materials Research, Vols. 374-377, pp. 865-868, 2012