AWWA ACE70475

This powerpoint presentation begins by providing bulleted points of the presentation's content that includes the following: NO₃^-, ClO₄^-, HAsO₄^2- easily removed bychloride IX w SBA;separate target ion from background ions,then regenerate/replace resin;IX run length, peaking, and regenerabilitydepend on affinity, K_ij or ? _ij, 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: C_i,Eff > C_i,In;peaking eliminated with selective resins;divalent selectivity: HCO₃^- * CO₃2^- + H⁺;highly preferred ions^1- hard to regenerate; and,natural selectivity reversal in for ions^y, easy regenerationand direct reuse of spent regenerant. Presentation conclusions indicate that: affinity of ions for resins, K_ij,?_ij, determine runlength, peaking, and regenerability; all but most preferred contaminants are subject topeaking; NO₃^-, ClO₄^- peaking eliminated -increase charge separation distance, andincrease hydrophobic nature;divalent preference promotes deprotonation ofpolyprotic anions and pH waves in anion columns; for divalent/monovalent--HAsO₄^2-/Cl^---exchange, selectivity reversal occurs anddirect reuse of brine is possible withoutremoving the arsenic; in absence of selectivity reversal, removal ofcontaminant--NO₃ ^-, ClO₄^---from brinebefore reuse is necessary. Includes table, figure.

Product Details

Edition:

Vol. - No.

Published:

11/01/2009

Number of Pages:

27

File Size:

1 file , 1.2 MB