Simultaneous removal of nitrate and heavy metals by iron metal

Hao, Zhiwei; Xu, Xinhua; Jin, Jiaxin; Ping, He; Liu, Yong; Wang, Dahui

doi:10.1631/jzus.2005.b0307

Cited by 20 publications

(13 citation statements)

References 8 publications

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“…This hypothesis is supported by previous studies, which showed that Ni was mainly scavenged by Fe oxyhydroxides (e.g. Xu et al, 2007;Gunsinger et al, 2006;Sterckeman et al, 2006;Dries et al, 2005;Hao et al, 2005;Stipp et al, 2002;Li et al, 2000). Nachtegaal and Sparks (2002) noted that this phenomenon was enhanced by the presence of humic acids.…”

Section: Tephra As An Active Barrier -The Case Of H3 Tephrasupporting

confidence: 80%

Long term mobilisation of chemical elements in tephra-rich peat (NE Iceland)

Vleeschouwer

Lanoé²,

Fagel

2008

Applied Geochemistry

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This paper presents geochemical profiles of a tephra-bearing minerotrophic peat column from NE-Iceland obtained using various elemental analyses of the solid phase and the pore water. The influence of tephra grain size, thickness and composition of each tephra on the peat geochemistry was investigated. Interpretations are supported by a statistical approach, in particular by autocorrelation, and by microscopy observations. Minerotrophic peat geochemistry may be strongly dependent upon post-depositional mobilization and possible leaching of elements as demonstrated by Fe and trace metal concentration profiles. Chemical elements, and more specifically potentially harmful metals, can be slowly leached out of volcanic falls during their weathering and re-accumulate downwards. It is emphasised that a tephra deposit can act as an active geochemical barrier, blocking downward elemental movements and leading to the formation of enriched layers. In this study, the formation of poorly amorphous Fe phases above the Hekla 3 tephra is shown. These poorly crystalline Fe phases scavenged Ni.

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Section: Tephra As An Active Barrier -The Case Of H3 Tephrasupporting

confidence: 80%

Long term mobilisation of chemical elements in tephra-rich peat (NE Iceland)

Vleeschouwer

Lanoé²,

Fagel

2008

Applied Geochemistry

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“…In particular, at pH values that are relevant to natural systems, iron readily precipitates and the adsorptive affinity of the oxide-film for cations is increased (pH > pH pzc ). Therefore, it is surprising that adsorption and co-precipitation has received less attention in the discussion results of cation removal by Fe 0 /H 2 O systems [43,44]. Hao et al [44] reported that Cu 2+ enhances nitrate reduction by Fe 0 .…”

Section: Fe 0 -Based Alloys In Hydrometallurgymentioning

confidence: 99%

“…Therefore, it is surprising that adsorption and co-precipitation has received less attention in the discussion results of cation removal by Fe 0 /H 2 O systems [43,44]. Hao et al [44] reported that Cu 2+ enhances nitrate reduction by Fe 0 . Even though this is possible through an indirect reaction, "NO 3 − removal" and "NO 3 − reduction" are not randomly interchangeable without precise investigations.…”

Section: Fe 0 -Based Alloys In Hydrometallurgymentioning

confidence: 99%

Fe0-based alloys for environmental remediation: Thinking outside the box

Noubactep¹,

Schöner

2009

Journal of Hazardous Materials

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“…Zero-valent metal (Fe 0 , Al 0 ) will remove [5,38,40] nitrates [41][42][43][44][45][46][47][48][49][50][51][52][53][54], nitrites [55,56], bromates [54], chlorates [54], organic compounds (including organo-halides [4][5][6][7]16,[57][58][59][60][61][62][63]) and metals (Ag [64], Al [5], As [40,65,66], Ba [5], Cd [12,64], Co [40], Cr [5,63], Cu [5,42], Fe [5], Hg [64], Mn [5], Ni [42], Pb …”

Section: Space Velocitymentioning

confidence: 99%

“…Adding Al salts to Fe 0 increases the rate of organic contaminant removal [38,70,71]. Adding Cu 0 to Fe 0 increases the rate of metal and nitrate contaminant removal [42]. Following n-ZVM injection/infiltration Eh and pH change progressively with time [6], i.e., the water composition is a function of space velocity, SV (m 3 H 2 O h −1 t −1 ZVM).…”

Section: Space Velocitymentioning

confidence: 99%

Sustainable Zero-Valent Metal (ZVM) Water Treatment Associated with Diffusion, Infiltration, Abstraction, and Recirculation

Antia¹

2010

Sustainability

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Socio-economic, climate and agricultural stress on water resources have resulted in increased global demand for water while at the same time the proportion of potential water resources which are adversely affected by sodification/salinisation, metals, nitrates, and organic chemicals has increased. Nano-zero-valent metal (n-ZVM) injection or placement in aquifers offers a potential partial solution. However, n-ZVM application results in a substantial reduction in aquifer permeability, which in turn can reduce the amount of water that can be abstracted from the aquifer. This study using static diffusion and continuous flow reactors containing n-ZVM and m-ZVM (ZVM filaments, filings and punchings) has established that the use of m-ZVM does not result in a reduction in aquifer permeability. The experimental results are used to design and model m-ZVM treatment programs for an aquifer (using recirculation or static diffusion). They also provide a predictive model for water quality associated with specific abstraction rates and infiltration/injection into an aquifer. The study demonstrates that m-ZVM treatment requires 1% of the weight required for n-ZVM treatment for a specific flow rate. It is observed that 1 t Fe 0 will process 23,500 m 3 of abstracted or infiltrating water. m-ZVM is able to remove >80% of nitrates from flowing water and adjust the water composition (by reduction) in an aquifer to optimize removal of nitrates, metals and organic compounds. The experiments demonstrate that ZVM treatment of an aquifer can be used to reduce groundwater salinity by 20 -> 45% and that an aquifer remediation program can be designed to desalinate an aquifer. Modeling indicates that widespread application of m-ZVM water treatment may reduce global socio-economic, climate and agricultural stress on water resources. The rate of oxygen formation during water reduction OPEN ACCESSSustainability 2010, 2 2989[by ZVM (Fe 0 , Al 0 and Cu 0 )] controls aquifer permeability, the associated aquifer pH, aquifer Eh and the degree of water treatment that occurs.

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Simultaneous removal of nitrate and heavy metals by iron metal

Cited by 20 publications

References 8 publications

Long term mobilisation of chemical elements in tephra-rich peat (NE Iceland)

Long term mobilisation of chemical elements in tephra-rich peat (NE Iceland)

Fe0-based alloys for environmental remediation: Thinking outside the box

Sustainable Zero-Valent Metal (ZVM) Water Treatment Associated with Diffusion, Infiltration, Abstraction, and Recirculation

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