This slide presentation outlines a study on enchanced silicon and boron removal during precipitative softening. Information on silicon and boron is outlined and includes:
Silicon - clogging of distribution system piping, reverse osmosis (RO) membranes;
Boron - toxicity to plants at fairly low levels(~ 0.3-1 mg/L for
initial symptoms),
possible human health concerns;
Lifetime Health Advisory of 0.6 mg/L issued in 1992; and,
WHO 0.5 mg/L; EU 1.0 mg/L. Topics outlined include: results from recent U.S. survey; Ames, Iowa WTP schematic; Ames data; current understanding of Si and B
removal during softening; "In situ" ppt of Mg for Si and B removal; mineral stability diagram; X-ray difraction; known and unknown parameters; equations; model results; Boron jar test data; and, Freundlich Isotherm fit. Conclusions indicated:
silicon removal during softening via am-Mg<sub>2</sub>SiO<sub>4</sub>;
enhanced boron removal via sorption to am-Mg<sub>2M</sub>SiO<sub>4</sub>; and,
boron removal estimated by Freundlich isotherm. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.4 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 26 |
| Published : | 06/01/2006 |
