Provide PDF Format
AWWA WKICO66062
- Chromium Treatment for Glendale, California's Groundwater: Mechanistic Studies of Weak-Base Anion Exchange
- Conference Proceeding by American Water Works Association, 01/01/2008
- Publisher: AWWA
$12.00$24.00
This powerpoint presentation begins by introducing a case study of Cr(VI) at Glendale, California. The methods for analyzing contaminant removalprocesses are examined and include:XRF, XRD, SEM, chemical tests, XAFS, leachingprocedures. Treatment implications fromanalytical results included:low pH is necessary for maximizing Cr(VI) capacity onWBA resins (but not SBA resins) - protonation of aminegroup, less OH- competition, HCrO<sub>4</sub><sup>-M/sup> speciation; Cr(VI) is reduced to Cr(III) by the two WBA resins,perhaps after being adsorbed;Cr is not retained on the resins in the form of smallprecipitates - added stability;lack of crystalline solids suggests another electron donorperhaps part of the ion exchange functional groups or thebackbone of the resin material; other elements are simultaneously removed by the WBAresins, such as U, V, and Cu - may limit operational life.Disposal options for treatmentresiduals are listed, along with TCLP Results, CWET Results, and Total Uranium Results. Summary and Conclusions: mechanism of WBA resin treatment involvesreduction of Cr(VI) to Cr(III);no evidence of crystalline Cr(III) precipitates on theresins;WBA resins likely to be classified as non-hazardous waste byfederal standards and hazardous waste by California standards; and,uranium accumulation may limit useful operationallife of one resin rather than capacity. Includes tables, figures.
Related Products
AWWA ACE95175
FIELD LOK Gaskets, An Effective Ductile Iron Pressure Pipe Joint Restraining System..
$12.00 $24.00