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Advanced defluoridation from industrial wastewater with high‐concentration fluoride through a novel three‐stage treatment process
Author(s) -
Xu Dechao,
Yu Boping,
Lu Xingxing,
Luo Sushuang,
Wang Weimian,
Zeng Yonghui,
Jin Xingliang,
Dai Zhiguang
Publication year - 2021
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12702
Subject(s) - fluorapatite , fluoride , effluent , reagent , precipitation , wastewater , pulp and paper industry , chemistry , stage (stratigraphy) , nuclear chemistry , waste management , environmental engineering , environmental science , apatite , mineralogy , inorganic chemistry , organic chemistry , geology , physics , meteorology , paleontology , engineering
A novel three‐stage treatment process corresponding to three reactors (R1, R2 and R3) was developed for advanced defluoridation from industrial wastewater with fluoride concentration as high as 245 mg/L. In the first stage (R1), 90.6 ± 0.8% of fluoride was removed through CaF 2 precipitation. Subsequently, the second stage (R2) was operated for advanced defluoridation through fluorapatite (FAP) precipitation. Importantly, the residual calcium in effluent of R1 participated in FAP precipitation in R2, reducing extra calcium dosage. In the third stage (R3), further defluoridation was observed in R3, and the final fluoride content in the effluent was as low as 0.15 mg/L in Phase 2. Advanced defluoridation from industrial wastewater with high‐concentration fluoride could be obtained through this process without coagulant addition to reduce sludge production and obtain relative pure chemical precipitates, and residual reagents could be utilized again in the next step during the process to decrease reagents dosage.