Study of mineralogy and leaching behavior of stabilized/solidified sludge using differential acid neutralization analysis

Peyronnard, Olivier; Blanc, D.; Benzaazoua, Mostafa; Morand, Pierre

doi:10.1016/j.cemconres.2009.03.012

Cited by 20 publications

(21 citation statements)

References 13 publications

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“…Little difference was observed in the concentrations and pH values between 1 and 2 years confirming that the samples were very close to equilibrium. C-S-H phases are not stable at this range of pH (<9.5) (Bernard et al, 2017a;Leisinger et al, 2014;Peyronnard et al, 2009;Shi and Stegemann, 2000;Swanton et al, 2016). It can be noted however that the calcium concentrations were much lower (0.15 to 0.46 mmol/L, depending on the initial calcium content, temperature and time) than the total amount of calcium that could theoretically be present in solution (11.93 ± 1.50 and 23.66 ± 2.60 mmol/L), which suggests the uptake of calcium by the solid…”

Section: Aqueous Phase Compositionmentioning

confidence: 98%

Magnesium and calcium silicate hydrates, Part I: Investigation of the possible magnesium incorporation in calcium silicate hydrate (C-S-H) and of the calcium in magnesium silicate hydrate (M-S-H)

Bernard

Lothenbach

Cau-dit-Coumes

et al. 2018

Applied Geochemistry

111

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Calcium silicate hydrate (C-S-H) and magnesium silicate hydrate (M-S-H) have been described as two separate phases. This work investigates their stability domains and the possible uptake of small amounts of magnesium by C-S-H or, reversely, the uptake of small amounts of calcium by M-S-H. The phases, synthesized by co-precipitation, are characterized using a large panel of techniques (thermogravimetry analysis, X-ray diffraction, X-ray pair distribution function analysis, 29 Si MAS-NMR spectroscopy, 17 measurement of zeta potential and cation exchange capacity) while the compositions of the solutions at 18 equilibrium are determined by ion chromatography and pH measurements. Syntheses of C-S-H samples 19 in the presence of magnesium ((Ca+Mg)/Si = 0.8 and Mg/Si = 0.05 or 0.10) yield two separate phases: 20

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Section: Aqueous Phase Compositionmentioning

confidence: 98%

Magnesium and calcium silicate hydrates, Part I: Investigation of the possible magnesium incorporation in calcium silicate hydrate (C-S-H) and of the calcium in magnesium silicate hydrate (M-S-H)

Bernard

Lothenbach

Cau-dit-Coumes

et al. 2018

Applied Geochemistry

111

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“…The PHREEQC program is based on the calculation of equilibrium between aqueous solutions and minerals, gases, solid solutions, exchangers, and sorption surfaces. As suggested by Peyronnard et al ( 2009 ), a simplified mineral assemblage was defined on the basis of the mineralogical study (XRD and SEM analysis) and chemical characterization. The acid attack was simulated on the assemblage by adding nitric acid or sodium hydroxide.…”

Section: Geochemical Modelingmentioning

confidence: 99%

Geochemical characterization and modeling of arsenic behavior in a highly contaminated mining soil

et al. 2016

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The environmental assessment and management of historical mining sites contaminated with various inorganic species require a better knowledge of pollutant-bearing phases. Among elements present in mining soils, arsenic is a toxic metalloid with potential high content and high mobility capacity into the environment. The objective of this paper was to investigate the mobility and fractionation of arsenic (As) in a highly As contaminated soil (ca. 3 wt%). The soil was collected from an old gold mining site in France, where mining activities and smelting processes of gold ores took place.

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“…In the present study, the leaching of metals of environmental concern was studied, including element forming cations (Cd, Cu, Mn, Ni, Pb, and Zn) and oxyanions (Cr, Mo and V) in solution. Regarding the pH dependent Cement and Concrete Research 40 (2010) [1639][1640][1641][1642][1643][1644][1645][1646][1647][1648][1649] leaching from cement based materials some relevant studies are available [4][5][6]. In our previous [2] and in the present study we expand the pH range compared to the earlier reported studies in order to cover the most acidic region as well as the alkaline pH above 13.…”

Section: Introductionmentioning

confidence: 99%

Leaching characterisation and geochemical modelling of minor and trace elements released from recycled concrete aggregates

Engelsen

Sloot

Wibetoe

et al. 2010

Cement and Concrete Research

132

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The pH dependent release of Cd, Cr, Cu, Mn, Mo, Ni, Pb, V and Zn from different recycled concrete aggregate samples was determined. Geochemical speciation modelling was applied on the concentrations of Cu, Cr, Mo and Ni in the leachates in order to predict the measured concentrations and the specific release mechanisms. The model was able to reproduce the characteristic pH dependent release patterns for these elements and reasonable to sometimes excellent matches between the predicted and measured concentrations were achieved. Binding of Mo and Cr as oxyanions (MoO 4 2− and CrO 4 2− ) to ettringite was modelled with fair agreement for Cr only. For Cu and Ni, the predicted and measured concentrations agreed well for the partly carbonated sample at high alkaline pH (11)(12)(13). The importance of complexation to humic substances was also shown in samples derived from construction debris.

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Study of mineralogy and leaching behavior of stabilized/solidified sludge using differential acid neutralization analysis

Cited by 20 publications

References 13 publications

Magnesium and calcium silicate hydrates, Part I: Investigation of the possible magnesium incorporation in calcium silicate hydrate (C-S-H) and of the calcium in magnesium silicate hydrate (M-S-H)

Magnesium and calcium silicate hydrates, Part I: Investigation of the possible magnesium incorporation in calcium silicate hydrate (C-S-H) and of the calcium in magnesium silicate hydrate (M-S-H)

Geochemical characterization and modeling of arsenic behavior in a highly contaminated mining soil

Leaching characterisation and geochemical modelling of minor and trace elements released from recycled concrete aggregates

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