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- Title
Application of nanofiltration in fluoride separation from aqueous solutions containing nitrate.
- Authors
Grzegorzek, Martyna; Majewska-Nowak, Katarzyna
- Abstract
Fluorine is a chemical element which could be hazardous for human health. The World Health Organization (WHO) estimated the safe fluoride level in drinking water to be 1.5 mg F-/dm3. Contamination of water environment by fluoride is observed all over the world, thus there is a need to develop an efficient fluoride removal method from natural waters. The objective of the study was to evaluate the fluoride removal efficiency from aqueous solutions by nanofiltration (NF) in the presence of monovalent salt (nitrate). The research was performed with the use of Amicon UF/NF stirred cell at the transmembrane pressure of 0.3 MPa. The NF membranes made of polyethersulfone (NP010P and NP030P, Microdyn-Nadir®) varied in divalent salt rejection, were applied in the process. The treated solutions contained fluoride ions (5, 15, and 100 mg F-/dm³) as well as nitrate ions (30, 60, and 90 mg NO3 -/dm³). The performed NF experiments revealed that it was possible to decrease the fluoride content in the permeate below the permissible limit of 1.5 mg F-/dm³ only for the lowest fluoride/nitrate content in the feed. The adverse effect of the nitrate presence on the fluoride removal efficiency was also detected. The relative permeability for both applied membranes varied from 0.37 to 1.0 depending on the salt concentration in the feed.
- Subjects
WORLD Health Organization; FLUORIDES; AQUEOUS solutions; NANOFILTRATION; WATER pollution; CHEMICAL elements; WATER levels; WATER filtration; DENITRIFICATION
- Publication
Desalination & Water Treatment, 2022, Vol 254, p189
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2022.28389