title: An approach for phosphate removal with quartz sand, ceramsite, blast furnace slag and steel slag as seed crystal.
abstract: The phosphate removal abilities and crystallization performance of quartz sand, ceramsite, blast furnace slag and steel slag were investigated. The residual phosphate concentrations in the reaction solutions were not changed by addition of the ceramsite, quartz sand and blast furnace slag. The steel slag could provide alkalinity and Ca(2+) to the reaction solution due to its hydration activity, and performed a better phosphate removal performance than the other three. Under the conditions of Ca/P 2.0, pH 8.5 and 10 mg P/L, the phosphate crystallization occurred during 12 h. The quartz sand and ceramsite did not improve the phosphate crystallization, but steel slag was an effective seed crystal. The phosphate concentration decreased drastically after 12 h after addition of steel slag, and near complete removal was achieved after 48 h. The XRD analysis showed that the main crystallization products were hydroxyapatite (HAP) and the crystallinity increased with the reaction time. Phosphate was successfully recovered from low phosphate concentration wastewater using steel slag as seed material.
authors.affiliation: School of Civil Engineering & Architecture, University of Jinan, China. lipingqiu@163.com
authors.forename: Liping
authors.initials: L
authors.lastname: Qiu
authors.forename: Guangwei
authors.initials: G
authors.lastname: Wang
authors.forename: Shoubin
authors.initials: S
authors.lastname: Zhang
authors.forename: Zhongxi
authors.initials: Z
authors.lastname: Yang
authors.forename: Yanbo
authors.initials: Y
authors.lastname: Li
mesh_terms: D002118:Calcium / Q000737:chemistry; D002516:Ceramics; D007220:Industrial Waste; D008669:Metallurgy; D010710:Phosphates / Q000737:chemistry*; D011791:Quartz; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D007220:Industrial Waste; D010710:Phosphates; D014874:Water Pollutants, Chemical; D014867:Water; D011791:Quartz; D002118:Calcium