Use of iron-based technologies in contaminated land and groundwater remediation: A review

Cundy, Andrew B.; Hopkinson, Laurence; Whitby, Raymond L. D.

doi:10.1016/j.scitotenv.2008.07.002

Cited by 550 publications

(237 citation statements)

References 54 publications

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“…As was present as arsenate despite the fact that ZVI is a rather powerful reducing agent (Cundy et al, 2008). Other oxyanions in the soil solution, such as phosphate, compete with arsenate for sorption sites (Manning and Goldberg, 1996;Violante and Pigna, 2002).…”

Section: Indicated Thatmentioning

confidence: 99%

“…Although ZVI can immobilize several contaminants including arsenic, copper and chromium in a short-term perspective (months to a few years) (Cundy et al, 2008;Kumpiene et al, 2006), questions about the long-term performance (several years) remain to be answered before this technique can be recommended with confidence by regulators. In particular, detailed knowledge is needed about the immobilizing mechanisms involved and how they might change with time.…”

Section: Indicated Thatmentioning

confidence: 99%

“…In particular, detailed knowledge is needed about the immobilizing mechanisms involved and how they might change with time. Reviews on chemical stabilization of soils highlight the need for long-term field studies (Cundy et al, 2008;Komarek et al, 2013;Kumpiene et al, 2008). In this work we used a combination of batch experiments, geochemical modeling and EXAFS spectroscopy to investigate the long-term performance of ZVI in soils contaminated with copper or arsenic.…”

Section: Indicated Thatmentioning

confidence: 99%

“…Further, trace elements can be co-precipitated with newlyformed iron (hydr)oxides (Komarek et al, 2013). Critical factors that affect the immobilization capacity of oxidized ZVI include pH and redox conditions, the volume of infiltrating water and microbial activity (Kumpiene et al, 2007), as well as the rate of crystallization of the formed iron (hydr)oxides (Cundy et al, 2008). the soil treated with ZVI and compost (pH 7.0) (Kumpiene et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Immobilization of Cu and As in two contaminated soils with zero-valent iron – Long-term performance and mechanisms

Tiberg

Kumpienė

Gustafsson

et al. 2016

Applied Geochemistry

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Immobilization of trace elements in contaminated soils by zero-valent iron (ZVI) is a promising remediation method, but questions about its long-term performance remain unanswered. To quantify immobilization and predict possible contaminant remobilization on long timescales detailed knowledge about immobilization mechanisms is needed. This study aimed at assessing the long-term effect of ZVI amendments on dissolved copper and arsenic in contaminated soils, at exploring the immobilization mechanism(s), and at setting up a geochemical model able to estimate dissolved copper and arsenic under different scenarios.Samples from untreated and ZVI-treated plots in two field experiments where ZVI had been added 6 and 15 years ago were investigated by a combination of batch experiments, geochemical modeling and extended X-ray absorption fine structure (EXAFS) spectroscopy.Dissolved copper and arsenic concentrations were described by a multisurface geochemical model with surface complexation reactions, verified by EXAFS. The ZVI remained "reactive" after 6-15 years, i.e. the dissolved concentrations of copper and arsenic were lower in the ZVI-treated than in the untreated soils. There was a shift in copper speciation from organic matter complexes in the untreated soil to surface complexes with iron (hydr)oxides in the ZVI-treated soil. The pH value was important for copper immobilization and ZVI did not have a stabilizing effect if pH was lower than about 6. Immobilization of arsenic was slightly pH-dependent and sensitive to the competition with phosphate. If phosphate was ignored in the modeling, the dissolution of arsenate was greatly underestimated.

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Section: Indicated Thatmentioning

confidence: 99%

Section: Indicated Thatmentioning

confidence: 99%

Section: Indicated Thatmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Immobilization of Cu and As in two contaminated soils with zero-valent iron – Long-term performance and mechanisms

Tiberg

Kumpienė

Gustafsson

et al. 2016

Applied Geochemistry

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“…Iron-based permeable reactive barriers (iron walls) have been successfully used as an efficient in situ remediation technology for groundwaters contaminated with various organic and inorganic compounds over the past 15 years [1][2][3][4][5]. The real mechanism of contaminant 1 removal is yet to be elucidated.…”

Section: Introductionmentioning

confidence: 99%