Fundamentals of ISCO Using Ozone

Clayton, Wilson S.; Petri, Benjamin G.; Huling, Scott G.

doi:10.1007/978-1-4419-7826-4_5

Cited by 8 publications

(6 citation statements)

References 98 publications

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“…However, it should be noted than the remediation performance of ISCO relies on the properties of the involved oxidants (Riegrist, Michelle, & Simpkin, ), in which ozone (O 3 ), permanganate (

{MnO}_{4}^{-}

), persulfate (

{normalS}_{2} {normalO}_{8}^{2 -}

), and hydrogen peroxide (H 2 O 2 ) are widely used. O 3 is unstable and difficult to store and transport (Clayton, Petri, & Huling, ). MnO 2 produced by the oxidation of pollutants with permanganate reduces the permeability of the system (Li & Schwartz, ).…”

Section: Introductionmentioning

confidence: 99%

The performance of nCaO₂ for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

Sun

Lyu

et al. 2019

Water Environment Research

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In this study, nano‐CaO2 (nCaO2) was successfully synthesized and constituted the nCaO2/Fe(II) system applying to remediate BTEX, which are typical mixed pollutants in contaminated groundwater. The particle size of the synthesized nCaO2 was 108.91 nm, and it displayed better BTEX remediation performance than that of commercial CaO2. The innovative generation pattern of hydroxyl radicals (HO·) in the nCaO2/Fe(II) system has been investigated using benzoic acid as the HO· probe, and the proper molar ratio of nCaO2/Fe(II) was optimized as 1/1. Over 90% of BTEX was removed in 180 min with the nCaO2/Fe(II)/BTEX molar ratio of 40/40/1. Further experiments evaluated the influence of co‐existence of mixed pollutants chlorinated hydrocarbon compounds (CHCs) or surfactant constituents on BTEX remediation performance. The experimental results suggested that CHCs have limited influence on BTEX removal rate and surfactants have negative effects on BTEX remediation performance in the experimental conditions. In conclusion, the findings in this study could give some inspirations to apply the nCaO2/Fe(II) process in remediating co‐existing pollutants in contaminated groundwater. Practitioner points nCaO2/Fe(II) system applied to remediate mixed contaminants. HO· generation pattern of the nCaO2/Fe(II) system has been investigated. The influence of chloride hydrocarbon compounds have been studied. The effects of surfactants were evaluated.

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“…However, it should be noted than the remediation performance of ISCO relies on the properties of the involved oxidants (Riegrist, Michelle, & Simpkin, ), in which ozone (O 3 ), permanganate (

{MnO}_{4}^{-}

), persulfate (

{normalS}_{2} {normalO}_{8}^{2 -}

Section: Introductionmentioning

confidence: 99%

The performance of nCaO₂ for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

Sun

Lyu

et al. 2019

Water Environment Research

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“…Because of its relatively high standard oxidation potential (2.07 V), ozone (O3) is a proven ISCO reagent for contaminated soil and groundwater (Bhuyan and Latin, 2012;Clayton et al, 2011;Huling and Pivetz, 2006). However, a key limitation for implementation of O3, and other strong oxidants, in the treatment of recalcitrant contaminant is the short half-live and high reactivity of the oxidant in the subsurface environment (Huling and Pivetz, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Radical scavengers, such as transition metals and soil organic matter associated with the subsurface materials, both aqueous and solid, can impose a significant oxidant demand, which ultimately reduces the amount of oxidant available for reaction with contaminants and increases the cost of treatment (e.g., Brusseau et al, 2011;Crimi and Siegrist, 2003;Marble et al, 2010;Mumford et al, 2004;Urynowicz, 2008;Xu and Thomson, 2009). The oxidant demand, as well as the reactivity of the oxidants, provides a serious challenge for the development of ISCO in general, and the variability and potential controls of O3 oxidant demand in ISCO systems remains subject to research (e.g., Clayton et al, 2011;Huling and Pivetz, 2006;Lim et al, 2002;Masten, 1991;Masten and Davies, 1997;Wang et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…O3 transforms contaminants through either direct oxidation or through decomposition and production of hydroxyl radicals, which then react with contaminants. Clayton et al review the relatively selective direct O3:contaminant reaction mechanisms and indirect contaminant oxidation by radicals generated by O3 (Clayton et al, 2011). The reactions that produce radicals from O3 are generally thought to follow either the Hoigne, Staehelin, and Bader model (Hoigne and Bader, 1983a;Hoigne and Bader, 1983b;Hoigne et al, 1985) or the Tomiyasu, Fukutomi, and Gordan model (Tomiyasu et al, 1985) mechanisms (Clayton et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Stabilization and prolonged reactivity of aqueous-phase ozone with cyclodextrin

Dettmer

Ball

Boving

et al. 2017

Journal of Contaminant Hydrology

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Recalcitrant organic groundwater contaminants, such as 1,4-dioxane, may require strong oxidants for complete mineralization. However, their efficacy for in-situ chemical oxidation (ISCO) is limited by oxidant decay and reactivity. Hydroxypropyl-β-cyclodextrin (HPβCD) was examined for its ability to stabilize aqueous-phase ozone (O) and prolong oxidation potential through inclusion complex formation. Partial transformation of HPβCD by O was observed. However, HPβCD proved to be sufficiently recalcitrant, because it was only partially degraded in the presence of O. The formation of a HPβCD:O clathrate complex was observed, which stabilized decay of O. The presence of HPβCD increased the O half-life linearly with increasing HPβCD:O molar ratio. The O half-life in solutions increased by as much as 40-fold relative to HPβCD-free O solutions. Observed O release from HPβCD and indigo oxidation confirmed that the formation of the inclusion complex is reversible. This proof-of-concept study demonstrates that HPβCD can complex O while preserving its reactivity. These results suggest that the use of clathrate stabilizers, such as HPβCD, can support the development of a facilitated-transport enabled ISCO for the O treatment of groundwater contaminated with recalcitrant compounds.

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“…[5][6][7][8][9] Ozone has also been used for the remediation of aquifers contaminated with organic contaminants by using a systems similar to AS processes. [10][11][12] Although ozone is a powerful oxidizing agent, injection of ozone-containing gas into the aquifer presents another engineering challenge. The inherent problem of implementing air sparging at field sites is that the zone of sparging influence is likely to be confined to the vicinity of the air injection point, and flow bypassing limits the direct contact of the injected air with the contaminated region.…”

Section: Introductionmentioning

confidence: 99%

Surfactant-enhanced ozone sparging for removal of organic compounds from sand

Kim

Yang

2013

Journal of Environmental Science and Health, Part A

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An innovative surfactant-enhanced ozone sparging (SEOS) technique was developed in this study. The synergistic effect of simultaneous surfactant and ozone application on the removal of organic contaminants in an aquifer during air sparging was investigated. Using laboratory-scale one- and two-dimensional physical models packed with water-saturated sand, air sparging and ozone sparging were implemented either at high or low level surface tension of the groundwater. A water-dissolved chemical (fluorescein sodium salt) and a nonaqueous phase liquid (n-decane) were used as the representative contaminants. Sodium dodecylbenzene sulfonate was used for sparging experiments at low level surface tension. Ozone sparging at low surface tension (SEOS) was found to be the most efficient process for the removal of organic chemicals, among AS (air sparging at high surface tension), SEAS (surfactant-enhanced air sparging, air sparging at low surface tension), and OS (ozone sparging at high surface tension), based on the results from a one-dimensional column study. Two-dimensional model experiments also showed that SEOS is more efficient than conventional AS processes. The increased air saturation and sparging influence zone achieved by surfactant application, and the oxidative power of ozone are responsible for the enhanced removal of contaminants from the aquifer. Considering that the application of conventional AS is limited to volatile contaminants, and that OS has a very narrow influence zone, SEOS can be an useful option for the removal of contaminants of low vapor pressures from an expanded zone of influence.

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Fundamentals of ISCO Using Ozone

Cited by 8 publications

References 98 publications

The performance of nCaO₂ for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

The performance of nCaO₂ for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

Stabilization and prolonged reactivity of aqueous-phase ozone with cyclodextrin

Surfactant-enhanced ozone sparging for removal of organic compounds from sand

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Fundamentals of ISCO Using Ozone

Cited by 8 publications

References 98 publications

The performance of nCaO2 for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

The performance of nCaO2 for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

Stabilization and prolonged reactivity of aqueous-phase ozone with cyclodextrin

Surfactant-enhanced ozone sparging for removal of organic compounds from sand

Contact Info

Product

Resources

About

The performance of nCaO₂ for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

The performance of nCaO₂ for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants