Visualization experiments of iron precipitates: Application for in-situ arsenic remediation

Darwish, Mohamed I.M.; Beek, Vera van; Bruining, J.

doi:10.1016/j.gexplo.2005.08.008

Cited by 8 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is reported that green rust (GR) will appear in the aerobic circumstance which was known as layered double hydroxides (LDH), in which [Fe (1−x) II Fe x III (OH) 2 ] x+ layers alternate with interlayers made of anions (such as CO 3 2− ,SO 4 2− or Cl − ). Arsenic can take part in the formation of GR, or which can be effectively adsorbed on the surface of GR [27]. Meanwhile, it is possible that transition materials like GR will not appear and instantaneous transformation from ferrous to ferric was happened.…”

Section: Release Of Arsenic and Iron From Frs In Acid Watermentioning

confidence: 99%

Arsenic removal from aqueous solution using ferrous based red mud sludge

Wang

Luan

et al. 2010

Journal of Hazardous Materials

View full text Add to dashboard Cite

a b s t r a c tFerrous based red mud sludge (FRS) which combined the iron-arsenic co-precipitation and the high arsenic adsorption features was developed aimed at low arsenic water treatment in rural areas. Arsenic removal studies shown that FRS in dosage of 0.2 or 0.3 g/l can be used effectively to remove arsenic from aqueous solutions when initial As(V) concentration was 0.2 or 0.3 mg/l. Meanwhile, turbidity of supernatant in disturbing water was lower than 2 NTU after 24 h. The pH range (4.5-8.0) for FRS in effective arsenic removal was applicable in natural circumstance. Phosphate can greatly reduce the arsenic removal efficiency while the presence of carbonate had no significant effect on arsenic removal. Arsenic fractionation experiments showed that amorphous hydrous oxide-bound arsenic was the major components. When aqueous pH was decreased from 8.0 to 4.5, arsenic in FRS was not obviously released. The high arsenic uptake capability, good settlement performance and cost-effective characteristic of FRS make it potentially attractive material for the arsenic removal in rural areas.

show abstract

Section: Release Of Arsenic and Iron From Frs In Acid Watermentioning

confidence: 99%

Arsenic removal from aqueous solution using ferrous based red mud sludge

Wang

Luan

et al. 2010

Journal of Hazardous Materials

View full text Add to dashboard Cite

show abstract

“…The formation of iron hydroxide after ferrous addition consists two steps: (1) oxidation of green rusts [22,23]. The rate of Fe(II) oxidation is extremely slow at a pH lower than 6 and it rises sharply above this pH [24].…”

Section: Arsenic Removal By Ferrous Addedmentioning

confidence: 99%

Evaluation of arsenic immobilization in red mud by CO2 or waste acid acidification combined ferrous (Fe2+) treatment

Wang

Peng

et al. 2012

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…However, the long term operating performance has not been demonstrated. Visualization of the oxidation of iron precipitates was conducted byDarwish et al (2006) to aid in understanding the phenomena associated with in-situ arsenic remediation. The spatial and temporal changes in Fe (II) distribution were recorded and reaction rates for arsenic removal were predicted.A pore diffusion model, combined with Freundlich isotherm parameters, was used byLin et al (2006) to simulate experimental arsenic removal data by an iron based adsorbent and ion exchange resin (Arsenex).The model with extracted coefficients was able to predict the kinetic adsorption curves for other experimental conditions, indicating that the model was appropriate for the system tested in the study.…”

mentioning

confidence: 99%