Long-term efficiency and kinetic evaluation of ZVI barriers during clean-up of copper containing solutions

Komnitsas, Kostas; Bartzas, Georgios; Fytas, Kostas; Paspaliaris, Ioannis

doi:10.1016/j.mineng.2007.05.002

Cited by 57 publications

(36 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Other recent studies reported that the presence of the abundant supply of H + ions at highly acidic solution, and the corrosion of Fe affects the deposition of metal on the iron surface. For some subtrates, such as iron (Fe), cementation rate decreases at high solution acidity due to the adsorption of H 2 formed at the metal surface (Equation 3), or the continuous coating of the iron surface with layers of secondary corrosion products (Equation 4) which causes the decrease in the available reduction sites for metal ions present in the solution phase (Djoudi et al, 2007;Komnitsas et al, 2007). This could be the reason why low Pb recovery was obtained at pH less than 1.…”

Section: Removal and Recovery Of Metalsmentioning

confidence: 99%

Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier

Alorro

Mitani

Hiroyoshi

et al. 2008

Minerals Engineering

View full text Add to dashboard Cite

Municipal solid waste (MSW) molten fly ash is classified as a hazardous waste because it contains considerable amount of heavy metals, which pose environmental concern due to their leaching potential in landfill environments. This study proposes Carrier-in-Pulp (CIP) method as a new hydrometallurgical route to extract and recover Pb, Zn, Cu, and Cd from molten fly ash before landfilling. In this method, a carrier material, which recovers the extracted metals, is added simultaneously with fly ash to a leaching solution and is harvested from the pulp by physical separation method, such as magnetic separation or sieving.To demonstrate the effect of the CIP method, shaking flask experiments were conducted under various conditions using NaCl solution, iron powder as carrier, and molten fly ash. More than 99 wt% Pb, Zn, and Cd, and 97 wt% Cu were extracted from the ash.

show abstract

Section: Removal and Recovery Of Metalsmentioning

confidence: 99%

Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier

Alorro

Mitani

Hiroyoshi

et al. 2008

Minerals Engineering

View full text Add to dashboard Cite

show abstract

“…The application of active treatment systems such as pump-and-treat methods, direct addition of lime to streams and open lime drains have also been used in the past for the remediation of acidic water. However, they are not suitable for large areas due to high operation and maintenance costs (Komnitsas et al 2007). Recently, attention has been paid to the use of permeable reactive barriers (PRBs) for remediating contaminated groundwater.…”

Section: Introductionmentioning

confidence: 99%

“…Several researchers (Karvonen 2004;Komnitsas et al 2007;Li and Benson 2005;Liang et al 2003;McMahon et al 1999;Puls et al 1999a;Sarr 2001;Vogan et al 1999;Yabusaki 2001) have reported that armouring on the surface of reactive materials and chemical clogging of pores, by precipitated compounds during chemical reactions inside the PRB, decrease the long-term performance parameters such as reactivity, porosity and permeability. Significant concerns relating to precipitation of iron and aluminium oxides and hydroxides also exist in alkaline PRBs with acidic groundwater in ASS terrain because their solubilities are pH-dependent.…”

Section: Introductionmentioning

confidence: 99%

Performance of a PRB for the Remediation of Acidic Groundwater in Acid Sulfate Soil Terrain

Indraratna

Regmi

Nghiem

et al. 2010

J. Geotech. Geoenviron. Eng.

View full text Add to dashboard Cite

Contaminated groundwater resulting from pyrite oxidation of acid sulphate soils (ASS) is a major environmental problem in coastal Australia. A column test was carried out for an extended period with recycled concrete to study the efficiency of the reactive materials for neutralising acidic groundwater. Results show that the actual acid neutralisation capacity of the recycled concrete could decrease to less than 50% of the theoretical value due to armouring effects. Nevertheless, the performance is good as a spot treatment in Acid Sulphate Soil Terrain utilising a near-zero cost waste product. Based on the test results and site characterisation, a PRB with recycled concrete was designed and installed in ASS terrain on the Shoalhaven River floodplain, southeastern, Australia in October 2006. The performance of the PRB was studied over two and half years to assess the potential of recycled concrete (i) to neutralise the groundwater acidity and (ii) to remove the dissolved heavy metals such as iron and aluminium from in situ acidic groundwater. To date, performance monitoring of the PRB shows that recycled concrete can successfully improve the pH of groundwater from acidic to mildly alkaline. In addition, it successfully removes groundwater iron and aluminium. Results reported here also reveal a slow decrease in the performance of the PRB due to armouring effects probably caused by precipitation of iron and aluminium on the surface of the reactive recycled concrete materials.

show abstract

“…the creation of permeable reactive barriers (PRB) containing n-ZVM (e.g., a physical static barrier within the aquifer containing n-ZVM) [5,[8][9][10][11][12][13][14][15]] and 2. the injection of n-ZVM into an aquifer with injected or infiltrating water [6,7,16,17].…”

Section: Zvm Treatmentmentioning

confidence: 99%

“…Sustainable Zero-Valent Metal (ZVM) water treatment associated with infiltration, abstraction, and recirculation removes metals (including As), nitrates, chloro-organics, sulphates, phosphates, organic chemicals) from water in the aquifer/GWM (or during abstraction/infiltration). ZVM treatment is experimental [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], but offers the potential to treat storm runoff, abstracted water and water within an aquifer. The experimental focus has been to identify if n-ZVM treatment actually reduces pollutants Where the ZVM treatment is effective the experimental studies have sought to identify the kinetic parameters associated with pollutant removal [5], i.e., the relationship between temperature and the rate of pollutant removal.…”

Section: Introductionmentioning

confidence: 99%

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

Antia¹

2010

Sustainability

View full text Add to dashboard Cite

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.

show abstract

Long-term efficiency and kinetic evaluation of ZVI barriers during clean-up of copper containing solutions

Cited by 57 publications

References 29 publications

Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier

Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier

Performance of a PRB for the Remediation of Acidic Groundwater in Acid Sulfate Soil Terrain

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

Contact Info

Product

Resources

About