Description
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 forinitial 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 Bremoval 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.
Product Details
- Edition:
- Vol. – No.
- Published:
- 06/01/2006
- Number of Pages:
- 26
- File Size:
- 1 file , 1.4 MB
- Note:
- This product is unavailable in Ukraine, Russia, Belarus
