This study evaluated a non-thermal process for recovering reverse osmosis
(RO) concentrate generated from desalting Colorado River water (CRW).
Studies sought to determine the mineral precipitation sequence in CRW
concentrate as a function of concentration factor (CF) and evaluate
chemical precipitation strategies to lower the component ions that drive
mineral precipitation. Above CF 10, mineral precipitates included CaSO4,
CaCO3, MgSO4, BaSO4, SrSO4, and silica. Lowering pH and adding
antiscalant suppressed precipitation below CF 10 but had no effect at
higher CF values. Precipitation studies showed that Ca++, Ba++, and Mg++
concentration could be reduced by 96 percent, 94 percent, and 62 percent,
respectively. Chemical precipitation also reduced dissolved silica by
94 percent; however, precipitation kinetics were slower. Further
concentrating chemically precipitated brine in a secondary RO process
showed that up to 80 percent brine recovery (98 percent total recovery)
may be feasible. Includes 10 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 980 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 18 |
| Published : | 11/01/2002 |
