This powerpoint presentation begins by providing bulleted points of the presentation's content that includes the following: NO<sub>3</sub><sup>-</sup>, ClO<sub>4</sub><sup>-</sup>, HAsO<sub>4</sub><sup>2-</sup> easily removed by
chloride IX w SBA;
separate target ion from background ions,
then regenerate/replace resin;
IX run length, peaking, and regenerability
depend on affinity, K<sub>ij</sub> or ? <sub>ij</sub>, of ion for
resin;
matrices: Sty-DVB and Polyacrylic-DVB;
functional groups: quaternary ammonium
Trimethyl, dimethylethanol (std. resins)
Triethyl, tripropyl, tributyl (selective resins); less-preferred ions peak: C<sub>i,Eff</sub> > C<sub>i,In</sub>;
peaking eliminated with selective resins;
divalent selectivity: HCO<sub>3</sub><sup>-</sup> * CO<sub>3</sub>2<sup>-</sup> + H<sup>+</sup>;
highly preferred ions<sup>1-</sup> hard to regenerate; and,
natural selectivity reversal in for ions<sup>y</sup>,
easy regeneration
and direct reuse of spent regenerant. Presentation conclusions indicate that: affinity of ions for resins, K<sub>ij</sub>,?<sub>ij</sub>, determine run
length, peaking, and regenerability; all but most preferred contaminants are subject to
peaking; NO<sub>3</sub><sup>-</sup>, ClO<sub>4</sub><sup>-</sup> peaking eliminated -
increase charge separation distance, and
increase hydrophobic nature;
divalent preference promotes deprotonation of
polyprotic anions and pH waves in anion columns; for divalent/monovalent--HAsO<sub>4</sub><sup>2-</sup>/Cl<sup>-</sup>--
exchange, selectivity reversal occurs and
direct reuse of brine is possible without
removing the arsenic; in absence of selectivity reversal, removal of
contaminant--NO<sub>3</sub> <sup>-</sup>, ClO<sub>4</sub>
<sup>-</sup>--from brine
before reuse is necessary. Includes table, figure.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.2 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 27 |
| Published : | 11/01/2009 |
