Oxidation of intermediate sulfur species (thiosulfate) by free chlorine to increase the bed life of tailored granular-activated carbon removing perchlorate

Judodine P. Patterson, Robert Parette, Fred Scott Cannon

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Thiosulfate (S2O32-) hosts redox stability in time frame of days, rendering it a candidate ion exchange competitor in anoxic groundwaters during the brief time frames of treatment processes. Indeed, this research determined that the oxyanion thiosulfate (S2O 32-) competed with perchlorate (ClO4 -) for sorption onto activated carbons that had been preloaded with a quaternary ammonium surfactant. Moreover, this research showed that when proper prechlorination oxidized this S2O32- to sulfate (SO42-), this competition was diminished. When rapid small-scale column test employed Redlands, CA, groundwater that contained a native 30 μg/L ClO4-, this exhibited a 6 μg/L ClO4- breakthrough after 33,000 bed volumes (BVs) when processed through bituminous-based granular-activated carbon that had been preloaded with a quaternary ammonium surfactant, namely, 0.24 g/g dicocoalkyldimethylammonium chloride (Arquad 2C-75). When this same water was spiked with 1,000 μg/L S2O32-, 6 μg/L of ClO4- broke through at 17,000 BV. However, when S 2O32- spiked Redlands groundwater was also spiked with 2,500 μg/L chlorine, this reactant stoichiometrically oxidized the S2O32- so as to diminish this competition, such that 6 μg/L ClO4- broke through at 31,000 BV. Similar rapid small-scale column test trends were exhibited when using deionized distilled water that had been spiked with ClO4-, S 2O32-, and chlorine.

Original languageEnglish (US)
Pages (from-to)835-843
Number of pages9
JournalEnvironmental Engineering Science
Volume27
Issue number10
DOIs
StatePublished - Oct 1 2010

Fingerprint

Thiosulfates
perchlorate
thiosulfate
Chlorine
Sulfur
Activated carbon
activated carbon
chlorine
Groundwater
sulfur
oxidation
Oxidation
groundwater
surfactant
Surface active agents
ammonium
Deionized water
Sorption
Ammonium Compounds
ion exchange

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

Cite this

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title = "Oxidation of intermediate sulfur species (thiosulfate) by free chlorine to increase the bed life of tailored granular-activated carbon removing perchlorate",
abstract = "Thiosulfate (S2O32-) hosts redox stability in time frame of days, rendering it a candidate ion exchange competitor in anoxic groundwaters during the brief time frames of treatment processes. Indeed, this research determined that the oxyanion thiosulfate (S2O 32-) competed with perchlorate (ClO4 -) for sorption onto activated carbons that had been preloaded with a quaternary ammonium surfactant. Moreover, this research showed that when proper prechlorination oxidized this S2O32- to sulfate (SO42-), this competition was diminished. When rapid small-scale column test employed Redlands, CA, groundwater that contained a native 30 μg/L ClO4-, this exhibited a 6 μg/L ClO4- breakthrough after 33,000 bed volumes (BVs) when processed through bituminous-based granular-activated carbon that had been preloaded with a quaternary ammonium surfactant, namely, 0.24 g/g dicocoalkyldimethylammonium chloride (Arquad 2C-75). When this same water was spiked with 1,000 μg/L S2O32-, 6 μg/L of ClO4- broke through at 17,000 BV. However, when S 2O32- spiked Redlands groundwater was also spiked with 2,500 μg/L chlorine, this reactant stoichiometrically oxidized the S2O32- so as to diminish this competition, such that 6 μg/L ClO4- broke through at 31,000 BV. Similar rapid small-scale column test trends were exhibited when using deionized distilled water that had been spiked with ClO4-, S 2O32-, and chlorine.",
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Oxidation of intermediate sulfur species (thiosulfate) by free chlorine to increase the bed life of tailored granular-activated carbon removing perchlorate. / Patterson, Judodine P.; Parette, Robert; Cannon, Fred Scott.

In: Environmental Engineering Science, Vol. 27, No. 10, 01.10.2010, p. 835-843.

Research output: Contribution to journalArticle

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N2 - Thiosulfate (S2O32-) hosts redox stability in time frame of days, rendering it a candidate ion exchange competitor in anoxic groundwaters during the brief time frames of treatment processes. Indeed, this research determined that the oxyanion thiosulfate (S2O 32-) competed with perchlorate (ClO4 -) for sorption onto activated carbons that had been preloaded with a quaternary ammonium surfactant. Moreover, this research showed that when proper prechlorination oxidized this S2O32- to sulfate (SO42-), this competition was diminished. When rapid small-scale column test employed Redlands, CA, groundwater that contained a native 30 μg/L ClO4-, this exhibited a 6 μg/L ClO4- breakthrough after 33,000 bed volumes (BVs) when processed through bituminous-based granular-activated carbon that had been preloaded with a quaternary ammonium surfactant, namely, 0.24 g/g dicocoalkyldimethylammonium chloride (Arquad 2C-75). When this same water was spiked with 1,000 μg/L S2O32-, 6 μg/L of ClO4- broke through at 17,000 BV. However, when S 2O32- spiked Redlands groundwater was also spiked with 2,500 μg/L chlorine, this reactant stoichiometrically oxidized the S2O32- so as to diminish this competition, such that 6 μg/L ClO4- broke through at 31,000 BV. Similar rapid small-scale column test trends were exhibited when using deionized distilled water that had been spiked with ClO4-, S 2O32-, and chlorine.

AB - Thiosulfate (S2O32-) hosts redox stability in time frame of days, rendering it a candidate ion exchange competitor in anoxic groundwaters during the brief time frames of treatment processes. Indeed, this research determined that the oxyanion thiosulfate (S2O 32-) competed with perchlorate (ClO4 -) for sorption onto activated carbons that had been preloaded with a quaternary ammonium surfactant. Moreover, this research showed that when proper prechlorination oxidized this S2O32- to sulfate (SO42-), this competition was diminished. When rapid small-scale column test employed Redlands, CA, groundwater that contained a native 30 μg/L ClO4-, this exhibited a 6 μg/L ClO4- breakthrough after 33,000 bed volumes (BVs) when processed through bituminous-based granular-activated carbon that had been preloaded with a quaternary ammonium surfactant, namely, 0.24 g/g dicocoalkyldimethylammonium chloride (Arquad 2C-75). When this same water was spiked with 1,000 μg/L S2O32-, 6 μg/L of ClO4- broke through at 17,000 BV. However, when S 2O32- spiked Redlands groundwater was also spiked with 2,500 μg/L chlorine, this reactant stoichiometrically oxidized the S2O32- so as to diminish this competition, such that 6 μg/L ClO4- broke through at 31,000 BV. Similar rapid small-scale column test trends were exhibited when using deionized distilled water that had been spiked with ClO4-, S 2O32-, and chlorine.

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