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This powerpoint presentation begins by providing bulleted points of the presentation's content that includes the following: NOsub3/subsup-/sup, ClOsub4/subsup-/sup, HAsOsub4/subsup2-/sup easily removed bychloride IX w SBA;separate target ion from background ions,then regenerate/replace resin;IX run length, peaking, and regenerabilitydepend on affinity, Ksubij/sub or ? subij/sub, of ion forresin;matrices: Sty-DVB and Polyacrylic-DVB;functional groups: quaternary ammoniumTrimethyl, dimethylethanol (std. resins)Triethyl, tripropyl, tributyl (selective resins); less-preferred ions peak: Csubi,Eff/sub Csubi,In/sub;peaking eliminated with selective resins;divalent selectivity: HCOsub3/subsup-/sup COsub3/sub2sup-/sup + Hsup+/sup;highly preferred ionssup1-/sup hard to regenerate; and,natural selectivity reversal in for ionssupy/sup, easy regenerationand direct reuse of spent regenerant. Presentation conclusions indicate that: affinity of ions for resins, Ksubij/sub,?subij/sub, determine runlength, peaking, and regenerability; all but most preferred contaminants are subject topeaking; NOsub3/subsup-/sup, ClOsub4/subsup-/sup peaking eliminated -increase charge separation distance, andincrease hydrophobic nature;divalent preference promotes deprotonation ofpolyprotic anions and pH waves in anion columns; for divalent/monovalent--HAsOsub4/subsup2-/sup/Clsup-/sup--exchange, selectivity reversal occurs anddirect reuse of brine is possible withoutremoving the arsenic; in absence of selectivity reversal, removal ofcontaminant--NOsub3/sub sup-/sup, ClOsub4/subsup-/sup--from brinebefore reuse is necessary. Includes table, figure.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 27File Size: 1 file , 1.2 MB