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AWWA ACE70575
- Oxidation of Thiosulfate by Free Chlorine to Increase the Bed Life of Tailored GAC to Remove Perchlorate
- Conference Proceeding by American Water Works Association, 11/01/2009
- Publisher: AWWA
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This powerpoint presentation begins by providing a brief overview of perchlorate and cationic surfactants. Hypotheses to test were: thiosulfate and other reduced sulfur speciescompetes with perchlorate for adsorption siteson the tailored granular activated carbon (GAC); proportional diffusivity is not the appropriatesimilitude equation for surfactant tailored GAC; and, loading of surfactant to GAC plays a role inperchlorate adsorption. Topics covered include: reduced sulfur species; thiosulfate oxidation rate; and, effect of anions on perchlorate adsorption to TGAC. Conclusions indicated that: Thiosulfate affects the adsorption of perchlorate toTailored GAC; proper prechlorination can markedly diminish theeffects of thiosulfate; anions such as nitrate interfere with the adsorptionof perchlorate to TGAC; and, oxidized forms of sulfur (SO<sub>4</sub><sup>2-</sup>) do not affect theadsorption of perchlorates as much as thiosulfate. Includes table, figures.
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