Removal of arsenic from wastewaters and stabilization of arsenic bearing waste solids: Summary of experimental studies

Twidwell, L.G.; Plessas, K.O.; Comba, P.; Dahnke, D. R.

doi:10.1016/0304-3894(93)e0054-6

Cited by 35 publications

(13 citation statements)

References 2 publications

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“…The syntheses were conducted so that the stoichiometry of the final products was in both rural and urban settings. Uptake of arsenic from waste, soil or water by phosphate compounds, particularly hydroxylapatite, has been investigated previously [1][2][3][4][5]. The technology arises from the low solubility of lead apatites (including lead phosphates and lead arsenates) and from their rapid precipitation reactions.…”

Section: Synthesismentioning

confidence: 99%

Fourier transform infrared spectroscopic study of hydroxylpyromorphite Pb10(PO4)6OH2–hydroxylmimetite Pb10(AsO4)6(OH)2 solid solution series

et al. 2015

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A total of seven compounds of the hydroxylmimetite Pb 10 (AsO 4) 6 (OH) 2hydroxylpyromorphite Pb 10 (PO 4) 6 (OH) 2 (HPY-HMI) solid solution series were synthesized at 80 °C from aqueous solutions and characterized using XRD, SEM-EDS and FTIR. The substitution effect of [PO 4 ] 3− anions by [AsO 4 ] 3− on systematic changes in lattice parameters and spectral properties has been explained based on correlation between chemical composition and the peak positions. The substitution results in systematic linear increase in unit cell parameters and unit cell volume. Isomorphic substitutions are apparent in IR as a change in the position and intensity of bands derived from phosphates, arsenates and hydroxyl ions. Main bands attributed to stretching

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Section: Synthesismentioning

confidence: 99%

Fourier transform infrared spectroscopic study of hydroxylpyromorphite Pb10(PO4)6OH2–hydroxylmimetite Pb10(AsO4)6(OH)2 solid solution series

et al. 2015

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“…Mimetite (Pb5(AsO4)3Cl), a lead arsenate chloride, was detected exclusively in the water-saturated H4 level at T4 and T8 (Fig.4). Mimetite precipitation was proposed to be part of a soil treatment technology allowing the removal of arsenate ions from solution (Twidwell et al, 1994 ;Bajda et al, 2006). Indeed, mimetite precipitates under conditions of low Pb and arsenate concentrations and has a stability domain that covers the pH range of natural waters (Magalhães and Silva 2003;Bajda 2010).…”

Section: Evolution Of the Mineralogical Associationmentioning

confidence: 99%

Influence of environmental changes on the biogeochemistry of arsenic in a soil polluted by the destruction of chemical weapons: A mesocosm study

Thouin

Battaglia-Brunet

Norini

et al. 2018

Science of The Total Environment

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Thermal destruction of chemical munitions from World War I led to the formation of a heavily contaminated residue that contains an unexpected mineral association in which a microbial As transformation has been observed. A mesocosm study was conducted to assess the impact of water saturation episodes and input of bioavailable organic matter (OM) on pollutant behavior in relation to biogeochemical parameters. Over a period of about eight (8) months, the contaminated soil was subjected to cycles of dry and wet periods corresponding to water table level variations. After the first four (4) months, fragmented litter from the nearby forest was placed on top of the soil. The mesocosm solid phase was sampled by three rounds of coring: at the beginning of the experiment, after four (4) months (before the addition of OM), and at the end of the experiment. Scanning electron microscopy coupled to energy dispersive X-ray spectroscopy observations showed that an amorphous phase, which was the primary carrier of As, Zn, and Cu, was unstable under water-saturated conditions and released a portion of the contaminants in solution. Precipitation of a lead arsenate chloride mineral, mimetite, in soils within the water saturated level caused the immobilization of As and Pb. Mimetite is a durable trap because of its large stability domain; however, this precipitation was limited by a low Pb concentration inducing that high amounts of As remained in solution. The addition of forest litter modified the quantities and qualities of soil OM. Microbial As transformation was affected by the addition of OM, which increased the concentration of both As(III)-oxidizing and As(V)-reducing microorganisms. The addition of OM negatively impacted the As(III) oxidizing rate, however As(III) oxidation was still the dominant reaction in accordance with the formation of arsenate-bearing minerals.

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“…As a result, it is considered to have great potential for remediation procedures (Bajda 2010). The mobility-and bioavailability of arsenic and lead can be controlled by mimetite crystallization (Twidwell et al 1994). However, the stability of mimetite decreases at low pH and in the presence of organic acids.…”

Section: Introductionmentioning

confidence: 99%

Dissolution of mimetite Pb₅(AsO₄)₃Cl in malic acid solutions

Turek¹,

Bajda²,

Manecki³

2015

Mineralogia

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Mimetite Pb5(AsO4)3Cl is the most insoluble lead arsenate mineral and could be used in remediation techniques to reduce As(V) mobility in soils. However, low-molecular-weight organic acids such as malic acid increase its solubility. The effect of malic acid on the dissolution of mimetite strongly depends on the pH of the equilibrium solution. At low pH, mimetite is decomposed mostly by the mechanism of protonation. With increasing pH, the solubility of mimetite decreases and a greater influence in its dissolution is ascribed to complexation of Pb(II) by organic ligands. During dissolution experiments, the amount of arsenic released to solution was > 26% higher in organic solutions than in inorganic solutions, and the amount of lead was > 8% greater. The solubility product of mimetite (KSP) was calculated in order to quantify the thermodynamic stability of the investigated mineral. The value obtained, i.e., -24.52 ± 0.49 fluctuates between the values of -21.69 ± 1.05 and -27.87 ± 0.42 reported in the literature.

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Removal of arsenic from wastewaters and stabilization of arsenic bearing waste solids: Summary of experimental studies

Cited by 35 publications

References 2 publications

Fourier transform infrared spectroscopic study of hydroxylpyromorphite Pb10(PO4)6OH2–hydroxylmimetite Pb10(AsO4)6(OH)2 solid solution series

Fourier transform infrared spectroscopic study of hydroxylpyromorphite Pb10(PO4)6OH2–hydroxylmimetite Pb10(AsO4)6(OH)2 solid solution series

Influence of environmental changes on the biogeochemistry of arsenic in a soil polluted by the destruction of chemical weapons: A mesocosm study

Dissolution of mimetite Pb₅(AsO₄)₃Cl in malic acid solutions

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Removal of arsenic from wastewaters and stabilization of arsenic bearing waste solids: Summary of experimental studies

Cited by 35 publications

References 2 publications

Fourier transform infrared spectroscopic study of hydroxylpyromorphite Pb10(PO4)6OH2–hydroxylmimetite Pb10(AsO4)6(OH)2 solid solution series

Fourier transform infrared spectroscopic study of hydroxylpyromorphite Pb10(PO4)6OH2–hydroxylmimetite Pb10(AsO4)6(OH)2 solid solution series

Influence of environmental changes on the biogeochemistry of arsenic in a soil polluted by the destruction of chemical weapons: A mesocosm study

Dissolution of mimetite Pb5(AsO4)3Cl in malic acid solutions

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Dissolution of mimetite Pb₅(AsO₄)₃Cl in malic acid solutions