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- Title
Rejection of small charged and uncharged organic pollutants in reverse osmosis of salty and seawaters.
- Authors
Samhari, Omar; Charik, Fatima Zohra; Belouatek, Aissa; Younssi, Saad Alami; Rabiller-Baudry, Murielle
- Abstract
Two organic solutes of close molecular weight (≈270 g mol–1) and hydrophobicity (logKow ≈ 1.2–1.5) were selected as model micropollutants to study their reverse osmosis in seawater. Tropaeolin O can be a monovalent/divalent anion whereas Thiamine can be a monovalent/divalent cation. Their charges and hydrophilic/hydrophobic balance can be modulated by playing on the pH and the ionic strength. The TFC-HR (Koch, USA) and SW30 (FilmTec, The Netherlands) membranes have shown a similar overall behavior either for single NaCl or Tropaeolin O filtrations. The comparison of Tropaeolin O/Thiamine rejections by the TFC-HR membrane has shown that membrane/solute electrostatic interactions explained the rejection in single solutions. However, in 30 g L–1 NaCl and synthetic seawater, rejections were more likely due to the hydrophobic/hydrophilic balance of a given solute: the more hydrophobic form being more rejected than the hydrophilic ones. Finally, the ethanol addition (30%) was achieved to study the impact of a second concentrated organics, moreover able to modify the background solvent of the filtration; Tropaeolin O rejection was decreased.
- Subjects
NETHERLANDS; REVERSE osmosis; ARTIFICIAL seawater; POLLUTANTS; IONIC strength; MOLECULAR weights; SALINE water conversion
- Publication
Desalination & Water Treatment, 2022, Vol 257, p1
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2022.28010