1,4-Dioxane degradation by oxidation and sonication in the presence of different-sized ZVI in open-air system

Shin, Jina; Lee, Young-Chul; Ahn, Yeonghee; Yang, Ji‐Won

doi:10.1080/19443994.2012.708554

Cited by 11 publications

(5 citation statements)

References 44 publications

(104 reference statements)

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“…It is significant to note that the persulfate concentration used herein, ~1 g/L, is an order of magnitude lower than the concentrations typically used in standard field ISCO applications. It is also interesting to note that the k (0.018 h −1 ) is comparable to the values (0.03~0.12 h −1 ) obtained with micron- or nano-ZVI in batch experiments (Son et al, 2009; Shina et al, 2012), indicating that the persulfate-enhanced PRB has the potential to achieve a dioxane removal efficiency similar to nano-ZVI. These results illustrate the potential of the persulfate-enhanced PRB for in-situ remediation of dioxane contaminated groundwater.…”

Section: Discussionsupporting

confidence: 66%

“…These contrasting results indicate that the iron filings apparently produced a small degree of dioxane degradation. Dioxane degradation in open aqueous systems in the presence of micron- (~44 μm) or nano-sized (~1 μm) particles of ZVI has been reported (Son et al, 2009; Shina et al, 2012). Such degradation was caused by dissolved oxygen oxidation catalyzed by the ZVI.…”

Section: Resultsmentioning

confidence: 99%

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In-situ activation of persulfate by iron filings and degradation of 1,4-dioxane

et al. 2015

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Activation of persulfate by iron filings and subsequent degradation of 1,4-dioxane (dioxane) was studied in both batch-reactor and column systems to evaluate the potential of a persulfate-enhanced permeable reactive barrier (PRB) system for combined oxidative-reductive removal of organic contaminants from groundwater. In batch experiments, decomposition of persulfate to sulfate and degradation of dioxane both occurred rapidly in the presence of iron filings. Conversely, dioxane degradation by persulfate was considerably slower in the absence of iron filings. For the column experiments, decomposition and retardation of persulfate was observed for transport in the columns packed with iron filings, whereas no decomposition or retardation was observed for transport in columns packed with a reference quartz sand. Both sulfate production and dioxane degradation were observed for the iron-filings columns, but not for the sand column. The pH of the column effluent increased temporarily before persulfate breakthrough, and significant increases in both ferrous and ferric iron coincided with persulfate breakthrough. Multiple species of free radicals were produced from persulfate activation as determined by electron paramagnetic resonance (EPR) spectroscopy. The impact of the oxidation process on solution composition and iron-filings surface chemistry was examined using ICP-MS, SEM-EDS, and XRD analyses. A two-stage reaction mechanism is proposed to describe the oxidation process, consisting of a first stage of rapid, solution-based, radical-driven, decomposition of dioxane and a second stage governed by rate-limited surface reaction. The results of this study show successful persulfate activation using iron filings, and the potential to apply an enhanced PRB method for improving in-situ removal of organic contaminants from groundwater.

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Section: Discussionsupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

In-situ activation of persulfate by iron filings and degradation of 1,4-dioxane

et al. 2015

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“…If a release of dioxane is associated with 1,1,1-trichloroethene (1,1,1-TCA), for which it served as a widespread stabilizer, , then the relatively high solubility and low sorption of dioxane could presumably lead to dioxane plumes that are longer than co-occurring chlorinated solvent plumes. This hypothesis is supported by the poor dioxane removal efficiency of many common treatment technologies (e.g., refs − ). Furthermore, it has only been in the past 10–15 years that evidence of significant biological degradation of dioxane has been reported. − A second component of this conceptual model is that dioxane plumes likely occupy large spatial footprints with significant portions of the impacted area associated with relatively low concentrations .…”

Section: Introductionmentioning

confidence: 85%

A Multisite Survey To Identify the Scale of the 1,4-Dioxane Problem at Contaminated Groundwater Sites

Adamson

Mahendra

Walker

et al. 2014

Environ. Sci. Technol. Lett.

129

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1,4-Dioxane (dioxane) is an emerging groundwater contaminant that has significant regulatory implications and potential remediation costs, but our current understanding of its occurrence and behavior is limited. This study used intensive data mining to identify and evaluate >2000 sites in California where groundwater has been impacted by chlorinated solvents and/or dioxane. Dioxane was detected at 194 of these sites, with 95% containing one or more chlorinated solvents. Dioxane frequently co-occurs with 1,1,1-trichloroethene (1,1,1-TCA) (76% of the study sites), but despite this, no dioxane analyses were conducted at 332 (67%) of the sites where 1,1,1-TCA was detected. At sites where dioxane has been identified, plumes are dilute but not large (median maximal concentration of 365 μg/L; median plume length of 269 m) and have been delineated to a similar extent as typically co-occurring chlorinated solvents. Furthermore, at sites where dioxane and chlorinated solvents co-occur, dioxane plumes are frequently shorter than the chlorinated solvent plumes (62%). The results suggest that dioxane has not migrated beyond chlorinated solvent plumes and existing monitoring networks at the majority of sites, and that the primary risk is the large number of sites where dioxane is likely to be present but has yet to be identified.

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“…although in most papers researchers try to minimize this effect in order to drive heterogeneous photo-Fenton, in a few recent papers leaching of iron is favoured to drive homogeneous neutral photo-Fenton. However, as hapenned with heterogeneus processes, this strategy has been more widely applied in dark Fenton, because of the more difficult illumination of a solution containing solid particles [93][94][95].…”

Section: "In Situ" Generation Of Ironmentioning

confidence: 99%

Strategies to Drive Photo-Fenton Process at Mild Conditions for the Removal of Xenobiotics from Aqueous Systems

Santos‐Juanes¹,

Amat

Arqués

2017

COC

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The aim of this paper is to provide an overview on the different approaches that can be employed to drive a photo-Fenton process under mild conditions, using both heterogeneous and homogeneous iron sources. For this purpose, sections are devoted to the following strategies: a) addition of iron at low concentrations; b) using the matrix of the effluent in order to avoid deactivation of iron; c) addition of chemical auxiliaries to form photoactive complexes with iron, such as carboxylates, chelating agents and humic-like macromolecules; d) strategies leading to the application of heterogeneous photo-Fenton process, by using iron-based solid particles or by hosting iron on different supports and; e) using heterogeneous iron sources as a reservoir for constant dosing of homogeneous iron photocatalyst. In particular, the review will focus on the elimination of emerging pollutants (e.g. drugs, personal care products or pesticides at low concentrations) which are the effluents where applying neutral photo-Fenton seems especially meaningful, although relevant works with other families of pollutants are also considered.

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1,4-Dioxane degradation by oxidation and sonication in the presence of different-sized ZVI in open-air system

Cited by 11 publications

References 44 publications

In-situ activation of persulfate by iron filings and degradation of 1,4-dioxane

In-situ activation of persulfate by iron filings and degradation of 1,4-dioxane

A Multisite Survey To Identify the Scale of the 1,4-Dioxane Problem at Contaminated Groundwater Sites

Strategies to Drive Photo-Fenton Process at Mild Conditions for the Removal of Xenobiotics from Aqueous Systems

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