期刊论文

Characteristic of Quasi-metastable Zone during HAP Crystallization and Its Use in Treatment of Low Concentrated Phosphate Wastewater

中文

环境科学与技术

1003-6504

2020

43

1

181-186

10.19672/j.cnki.1003-6504.2020.01.026

51408068:国家自然科学基金 51809020:国家自然科学基金 18A122:湖南省教育厅科学研究重点项目

本校为第一机构

该研究综合均相与诱导结晶法构建羟基磷酸钙(HAP)结晶类介稳区,借助类介稳区特性分析,寻求优化的HAP结晶条件,以期提高HAP结晶除磷技术对低磷污水的适应性能。结果表明,HAP类介稳区的分布,与诱导结晶条件如初始Ca~(2+)浓度和终态PO_4~(3-)-P、OH-浓度,以及晶种类型、粒径、投加量相关。优化上述结晶条件可增加类介稳区宽度,提高对低磷污水适应性,并达到抑制均相结晶、改善结晶产物固液分离性能的效果。优化条件下,HAP诱导结晶可将典型低磷污水——污水厂二级出水中PO_4~(3-)-P浓度由1.0 mg/L降至0.5 mg/L甚至0.3 mg/L以下,同时出水pH值控制在9.0以下。去除的磷以HAP形式进行回收利用。

Using methods of both homogeneous and induced crystallization,the quasi-metastable zone of hydroxyapatite(HAP)crystallization was established,of which the characteristics were investigated in this study in order to improve the phosphorus recovery efficiency of HAP crystallization for low concentrated phosphate wastewater.The results showed that the distribution of quasi-metastable zone can be influenced by the HAP induced crystallization conditions such as initial concentration of Ca~(2+),final PO_4~(3-)-P concentration and pH value,and the material,particle size and dosage of seeds.The optimi...