Research Article
Removal of High-Concentration Sulfate from Seawater by Ettringite Precipitation
Table 2
Sulfate and calcium concentrations in treated seawater by using CaSO4, BaSO4, and ettringite precipitation methods.
| | Chemical | Dosage (g/L) | Sulfate (ppm) | Calcium (ppm) | Precipitates |
| | CaCl2·2H2O | 9.4 | 1,677 | 5,382 | CaSO4 | | CaO | 2.5 | 3,258 | 1,319 | CaSO4 | | Ca (OH)2 | 10.4 | 2,301 | 2,836 | CaSO4 | | BaCl2·2H2O | 9.4 | 301 | 506 | BaSO4 | | NaAlO2/CaO | 7.5/10.9 | 402 | 811 | Ettringite | | PAC/AlCl3/CaO | 2.86/7.2/7.2 | 2,388 | 2,434 | Ettringite |
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