A long-term bench-scale investigation of permanganate consumption by aquifer materials

Xu, Xiuyuan; Thomson, Neil R.

doi:10.1016/j.jconhyd.2009.09.001

Cited by 38 publications

(24 citation statements)

References 31 publications

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“…10 U.S. standard mesh sieve (2.00 mm) were used in this investigation. A summary of the pertinent physical and geochemical properties of the aquifer materials is provided in Table 1 (see Xu and Thomson (2009) for additional information).…”

Section: Aquifer Materialsmentioning

confidence: 99%

Hydrogen Peroxide Persistence in the Presence of Aquifer Materials

Thomson

2010

Soil and Sediment Contamination: An International Journal

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In situ chemical oxidation using hydrogen peroxide for groundwater remediation has received a great deal of attention over the last 15 years. A comprehensive investigation that focused on the interaction between hydrogen peroxide and eight aquifer materials was performed using both batch and column experiments. The results from the batch experiments indicated that the decomposition of hydrogen peroxide in the presence of various aquifer materials followed a first-order rate law, and was strongly affected by the content of amorphous transition metals. The exposure of the aquifer solids to hydrogen peroxide for 14 days indicated that not all forms of natural organic matter (NOM) contributed to the observed decomposition. Multiple linear regression analysis was used to generate two potentially useful predictive decomposition rate coefficient relationships based on the various aquifers' material characteristics. Column experiments were conducted with five representative aquifer materials to complement and expand the findings from the batch experiments. As expected the decomposition rate coefficients were higher in the column experiments relative to the batch experiments due to the larger solids mass to solution volume ratio. Attempts to simulate the column observations indicated that dissolution and transport of metals from aquifer solids may play an important role in hydrogen peroxide persistence in some subsurface environments.

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Section: Aquifer Materialsmentioning

confidence: 99%

Hydrogen Peroxide Persistence in the Presence of Aquifer Materials

Thomson

2010

Soil and Sediment Contamination: An International Journal

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“…Thus aquifer materials exposed to permanganate exhibit a finite or an ultimate natural oxidant demand (NOD) (8)(9)(10). Once the ultimate NOD of the solids has been satisfied, permanganate is relatively stable in the subsurface for extended periods of time (3,11).…”

Section: Introductionmentioning

confidence: 99%

Persistence of Persulfate in Uncontaminated Aquifer Materials

Kanwartej

Thomson

Barker

2010

Environ. Sci. Technol.

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127

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Batch and stop-flow column experiments were performed to estimate persulfate decomposition kinetic parameters in the presence of seven well-characterized aquifer materials. Push-pull tests were conducted in a sandy aquifer to represent persulfate decomposition under in situ conditions. The decomposition of persulfate followed a first-order rate law for all aquifer materials investigated. Reaction rate coefficients (k(obs)) increased by an order of magnitude when persulfate concentration was reduced from 20 g/L to 1 g/L, due to ionic strength effects. The column experiments yielded higher k(obs) than batch experiments due to the lower oxidant to solids mass ratio. The kinetic model developed from the batch test data was able to reproduce the observed persulfate temporal profiles from the push-pull tests. The estimated k(obs) indicate that unactivated persulfate is a persistent oxidant for the range of aquifer materials explored with half-lives ranging from 2 to 600 d.

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“…1) which implies that there are at least two oxidation steps or two fractions of oxidizable material for the reed peat, where only the rate for the fast step or fraction is dependent on temperature. Fast and slow reactive structures have already been noticed in previous studies (Mumford et al, 2005;Xu and Thomson, 2009;Cha et al, 2012), but none of these authors considered differences in temperature dependence. As mentioned above both reed peat and forest peat appear to have persistent fractions.…”

Section: Oxidation Of Specific Nom Typesmentioning

confidence: 93%

“…Substitution of a hydrogen by a carbonyl (AC@O), carboxyl or nitro (ANO 2 ) group has the opposite effect and decreases the reactivity (Schnitzer and Desjardins, 1970;Arndt and Lee, 1981;Fatiadi, 1987;Waldemar and Tratnyek, 2006). The differences in reactivity of the various NOM constituents with permanganate have been shown in several recent studies, in which fast and slow oxidizing fractions were observed (Mumford et al, 2005;Xu and Thomson, 2009;Cha et al, 2012).…”

Section: Introductionmentioning

confidence: 96%