Fifteen-year assessment of a permeable reactive barrier for treatment of chromate and trichloroethylene in groundwater

Wilkin, Richard T.; Acree, Steven D.; Ross, Randall R.; Puls, Robert W.; Lee, Tony R.; Woods, Leilani L

doi:10.1016/j.scitotenv.2013.08.056

Cited by 117 publications

(89 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As a result, removal of Cr VI in Fe 0 /H 2 O systems via direct reduction with Fe 0 should, theoretically, have a very low efficiency [83][84][85][86]. Nevertheless, the long-term efficiency of Fe 0 /H 2 O systems for Cr VI removal in reactive walls has been undoubtedly demonstrated [9]. In recent years, several studies have attempted to predict and/or rationalize this observation.…”

Section: More Recent Laboratory-scale Reports (Post Elisabeth City Prb)mentioning

confidence: 99%

“…Another argument put forward to rationalize Cr VI reduction in Fe 0 /H 2 O systems is the prevalence of secondary Fe II -bearing minerals phases formed as Fe 0 corrosion products. Enumerated minerals include ferrous sulfides, magnetite, makinawite, siderite, or green rust [6,9,55,94,95]. Even though reduction of Cr VI at the surface of secondary mineral layers was initially believed to be slow [88], recent studies revealed that, actually, Cr VI may be rapidly sequestrated at the surface of Fe II -bearing minerals containing structural Fe II and/or Fe II impurities, following an adsorption-reduction mechanism [96,97].…”

Section: More Recent Laboratory-scale Reports (Post Elisabeth City Prb)mentioning

confidence: 99%

See 1 more Smart Citation

Progress in Understanding the Mechanism of CrVI Removal in Fe0-Based Filtration Systems

Gheju¹

2018

Water

View full text Add to dashboard Cite

Hexavalent chromium (Cr VI ) compounds are used in a variety of industrial applications and, as a result, large quantities of Cr VI have been released into the environment due to inadequate precautionary measures or accidental releases. Cr VI is highly toxic to most living organisms and a known human carcinogen by inhalation route of exposure. Another major issue of concern about Cr VI compounds is their high mobility, which easily leads to contamination of surface waters, soil, and ground waters. In recent years, attention has been focused on the use of metallic iron (Fe 0 ) for the abatement of Cr VI polluted waters. Despite a great deal of research, the mechanisms behind the efficient aqueous Cr VI removal in the presence of Fe 0 (Fe 0 /H 2 O systems) remain deeply controversial. The introduction of the Fe 0 -based filtration technology, at the beginning of 1990s, was coupled with the broad consensus that direct reduction of Cr VI by Fe 0 was followed by co-precipitation of resulted cations (Cr III , Fe III ). This view is still the dominant removal mechanism (reductive-precipitation mechanism) within the Fe 0 remediation industry. An overview on the literature on the Cr geochemistry suggests that the reductive-precipitation theory should never have been adopted. Moreover, recent investigations recalling that a Fe 0 /H 2 O system is an ion-selective one in which electrostatic interactions are of primordial importance is generally overlooked. The present work critically reviews existing knowledge on the Fe 0 /Cr VI /H 2 O and Cr VI /H 2 O systems, and clearly demonstrates that direct reduction with Fe 0 followed by precipitation is not acceptable, under environmental relevant conditions, as the sole/main mechanism of Cr VI removal in the presence of Fe 0 .

show abstract

Section: More Recent Laboratory-scale Reports (Post Elisabeth City Prb)mentioning

confidence: 99%

Section: More Recent Laboratory-scale Reports (Post Elisabeth City Prb)mentioning

confidence: 99%

Progress in Understanding the Mechanism of CrVI Removal in Fe0-Based Filtration Systems

Gheju¹

2018

Water

View full text Add to dashboard Cite

show abstract

“…Zero valent iron (Fe 0 , ZVI) has been placed in permeable reactive barriers (PRB's) and injected into aquifers in order to effect aquifer remediation since the 1970s (e.g., [6][7][8][9][10]70,71,[93][94][95][96][97][98]). The principle historical remediation focus has been on the removal of organo-chlorides, organo-nitrates, phosphates, nitrates, arsenic and heavy metals (e.g., [26,70,71,93,94,[99][100][101][102]).…”

Section: E4 Loss Of Reactivity With Timementioning

confidence: 99%

“…Desalination associated with zero valent iron (ZVI, Fe 0 ) has been demonstrated in more than 160 batch trials (utilizing 0.2-240 L/batch [1][2][3][4][5]) and by monitoring the salinity of water flowing through granular Fe 0 permeable reactive barriers (PRB) [6][7][8][9][10]. These trials have demonstrated that ZVI desalination has potential applications for groundwater management, road runoff water management, agricultural water management, municipal and domestic water, emergency and disaster water requirements, feed and waste water treatment associated with conventional desalination plants, waste water associated with the extractive industries and environmental damage mitigation [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…These trials have demonstrated that ZVI desalination has potential applications for groundwater management, road runoff water management, agricultural water management, municipal and domestic water, emergency and disaster water requirements, feed and waste water treatment associated with conventional desalination plants, waste water associated with the extractive industries and environmental damage mitigation [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

ZVI (Fe0) Desalination: Stability of Product Water

Antia¹

2016

Resources

View full text Add to dashboard Cite

A batch-operated ZVI (zero valent iron) desalination reactor will be able to partially desalinate water. This water can be stored in an impoundment, reservoir or tank, prior to use for irrigation. Commercial development of this technology requires assurance that the partially-desalinated product water will not resalinate, while it is in storage. This study has used direct ion analyses to confirm that the product water from a gas-pressured ZVI desalination reactor maintains a stable salinity in storage over a period of 1-2.5 years. Two-point-three-litre samples of the feed water (2-10.68 g (Na + + Cl´)¨L´1) and product water (0.1-5.02 g (Na + + Cl´)¨L´1) from 21 trials were placed in storage at ambient (non-isothermal) temperatures (which fluctuated between´10 and 25˝C), for a period of 1-2.5 years. The ion concentrations (Na + and Cl´) of the stored feed water and product water were then reanalysed. The ion analyses of the stored water samples demonstrated: (i) that the product water salinity (Na + and Cl´) remains unchanged in storage; and (ii) the Na:Cl molar ratios can be lower in the product water than the feed water. The significance of the results is discussed in terms of the various potential desalination routes. These trial data are supplemented with the results from 122 trials to demonstrate that: (i) reactivity does not decline with successive batches; (ii) the process is catalytic; and (iii) the process involves a number of steps.

show abstract

Water Remediation by Metallic Iron: Much Ado About Nothing – As Profitless as Water in a Sieve?

Noubactep¹

2014

CLEAN Soil Air Water

View full text Add to dashboard Cite

Fifteen-year assessment of a permeable reactive barrier for treatment of chromate and trichloroethylene in groundwater

Cited by 117 publications

References 25 publications

Progress in Understanding the Mechanism of CrVI Removal in Fe0-Based Filtration Systems

Progress in Understanding the Mechanism of CrVI Removal in Fe0-Based Filtration Systems

ZVI (Fe0) Desalination: Stability of Product Water

Water Remediation by Metallic Iron: Much Ado About Nothing – As Profitless as Water in a Sieve?

Contact Info

Product

Resources

About