Open AccessTreatment of High Fluorine Surface Water by Crystal Seed Method
Author(s) -
Qian Luo,
Yiming Lei,
Jianyu Chen,
Fanghua Lin,
Jingshi Li,
Xingui Yi,
Wenzhong Liang
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/598/1/012050
Subject(s) - fluoride , fluorine , calcite , crystal (programming language) , calcium , seed crystal , ion , chemistry , molar concentration , phosphate , inorganic chemistry , materials science , nuclear chemistry , mineralogy , single crystal , crystallography , organic chemistry , computer science , programming language
In view of the current defluorination process of surface water mainly concentrated on the treatment of reduce the concentration of fluoride to less than 10 mg/L, but less research on the treatment of reduce the concentration of fluoride less than 1.0 mg/L, the existing technology are complex process, and the cost is high. High concentration fluoride surface water was treated by crystal seed process which high-purity calcium fluophosphate and calcite as seed crystal. The best operation conditions for fluoride removal were confirmed through the single factor experiments and orthogonal test: adding seed crystal(Calcite: calcium fluophosphate is 1:4) of 8 g/L with Na 3 PO 4 and CaCl 2 to make molar ratio of the calcium ion, phosphate ion and fluorin ion be 12:6:1,the reaction time was 1 h, and the stirring rate was 200 r/min. High removal rate of fluorine ion and utilization rate of phosphate ion were also achieved during the reaction ( higher than 94% and 97%,respectively). This research proved that the crystal seed process could reduce the concentration of fluoride in surface water from 15 mg/L to less than 1mg/L which meets the standard of surface water environment quality.