所属单位：环境与市政工程学院

发表刊物：Chemical Engineering Journal

关键字：中文关键字：诱导结晶；氟去除；氟磷酸钙；方解石；晶种，英文关键字：Induced crystallization; Fluoride removal; Fluorap

摘要：The removal of fluoride from water by induced crystallization using fluorapatite (FAP)/calcite seed crystals was investigated. Batch experiments were conducted to determine optimal operating parameters. The effect of FAP/calcite mass ratio of the seed crystals, initial seed crystal concentration, molar ratios of Ca2+:PO4 3:F and contact time were examined. FAP/calcite with any mass ratio reduced fluoride concentrations from 9.5 mg/L (0.5 mM) to less than 1 mg/L. The use of FAP alone and calcite alone was not effective. Use of initial seed crystal concentrations greater than 4.0 g/L were correlated to residual fluoride concentrations less than 1.0 mg/L. The optimal parameters for fluoride removal were an initial seed crystal concentration of 6 g/L (FAP 4.8 g/L, calcite 1.2 g/L), Ca/P/F molar ratio of 8:4:1, and contact time of 1 h. The final pH was always close to neutral. The presence of natural organic matter (NOM) in the raw water was found to not affect fluoride removal. SEM–EDS and XRD analysis showed that fluoride removal was due to crystallization of Ca5(PO4)3F on the surface of FAP. Phosphate, but not fluoride, accumulated on calcite by adsorption. The seed crystal could be regenerated easily, and used repeatedly, and used seed crystals could also be used as resources in phosphorus fertilizer production. Induced crystallization using FAP/calcite as a seed crystal is an economically and environmentally friendly process, and has the potential to remove fluoride from groundwater.

备注：邓林煜

合写作者：刘亚威,孙田

第一作者：黄廷林,邓林煜

论文类型：期刊论文

卷号：卷：287

期号：期：

页面范围：页：83-91

是否译文：否

发表时间：2016-03-01