Selective removal of sulfate ion from different drinking waters

The sulfate anion is a stable, oxidized form of sulfur that is an essential nutrient for plants and animals. Due to its stability, sulfate is part of a large number of natural minerals, the most common being gypsum (CaSO4·2H2O), anhydrite (CaSO4), baryte (BaSO4) and celestine (SrSO4). Sulfate is an important component of non-polluted waters and is part of the six major ions in surface waters (Na+, Ca2+, Mg2+, Cl−, HCO3−, SO42−). Depending on its...