Low-grade MgO used to stabilize heavy metals in highly contaminated soils

García, M. Villegas; Chimenos, J.M.; Fernández, A. Inés; Miralles, L.; Segarra, M.; Espiell, F.

doi:10.1016/j.chemosphere.2004.04.005

Cited by 101 publications

(49 citation statements)

References 10 publications

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“…Magnesia (MgO) has been reported to have superior immobilisation capacities for a wide range of contaminants due to (1) its pH neutralisation range of 9e11, where the solubility of metal hydroxides are at their minimum; (2) ion-exchange between magnesium and other metal cations and (3) complexation between contaminants and OH-groups on the MgO surface (García et al, 2004;R€ otting et al, 2006;Cubukcuoglu and Ouki, 2012;Tresintsi et al, 2013). In addition to numerous studies (Bochkarev et al, 2007;Nagappa and Chandrappa, 2007;Moussavi and Mahmoudi, 2009) on the wastewater treatment using MgO, a few studies (García et al, 2004;Iyengar, 2008;Suzuki et al, 2013;Wang et al, 2015a) have been carried out on the utilisation of MgO for contaminated land remediation.…”

Section: Introductionmentioning

confidence: 99%

Three-year performance of in-situ solidified/stabilised soil using novel MgO-bearing binders

2016

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A new group of MgO-bearing binders has been developed recently which showed improved sustainability and technical performance compared to Portland cement (PC). However, the application of these MgO-bearing binders in the Solidification/Stabilisation (S/S) techniques is very limited. This study investigates the three-year performance of a highly contaminated soil treated by in-situ S/S using MgO-bearing binders and PC. The core quality, strength, permeability and the leaching properties of the S/S materials were evaluated. The effects of binder composition, addition of inorgano-organo-clay (IOC) and the grout content on the properties of the 3-y S/S materials are discussed. It is found that although MgO alone provided negligible strength to the soil, it is superior in immobilising both inorganic and organic contaminants. Replacing MgO by ground granulated blast-furnace slag (GGBS) significantly enhanced the strength while also performed well in immobilising the contaminants. The improved pH buffering capacity was attributed to the low solubilities of brucite and hydrotalcite-like phases formed in the MgO-bearing binders, and was also the reason for the improved performance in stabilising contaminants. The addition of IOC slightly decreased the strength and the permeability of the S/S materials but inconsistent effect on the contaminant immobilisation was found depending on the binder composition. This study showed no degradation of the S/S materials after 3 y exposure to field conditions and has proved the applicability and the advantages of MgO-bearing binders over PC in S/S.

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Section: Introductionmentioning

confidence: 99%

Three-year performance of in-situ solidified/stabilised soil using novel MgO-bearing binders

2016

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“…The MFGDR may increase the available P and then result in the generation of residual fraction, since the P causes precipitation of a new discrete Pb mineral phase, which is stable and typically found in arable soils (Brown et al 2005). However, part of residual fraction in T1 and T2 treatments was converted into Fe-Mn oxide-bound and organic matter-bound fraction after harvest, since high alkaline condition may cause a reverse trends on Pb stability due to the amphoteric nature of Pb (Heasman et al 1997;Garcı et al 2004), andGeebelen et al (2003) suggests that the pH value of soil at 8.1 and below can increase the Pb leaching.…”

Section: Speciation Analysis On Heavy Metals In Soilmentioning

confidence: 96%

The Effects of Modified Flue Gas Desulfurization Residue on Growth of Sweet Potato and Soil Amelioration

Wang

Shi

2015

Water Air Soil Pollut

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We report on treatment and disposal of flue gas desulfurization (FGD) as a solid and hazardous waste. The effects of modified flue gas desulfurization residue (MFGDR) prepared by calcining a mixture of dry/semi-dry FGD residue, potassium feldspar, and/or limestone power on growth of plant and soil amelioration are investigated. The effect of MFGDR on the sweet potato was evaluated by analyzing the soil physiochemical properties and heavy metal speciation in the soil, and the yield, quality, and heavy metal concentrations of the sweet potato. The results indicated that applying MFGDR as soil ameliorant increased total yield by 53.38 %, safety, and the quality of sweet potato. The concentrations of Cd, Cr, Cu, Pb, and As in the sweet potato reduced by 31.34, 70.57, 22.17, 79.49, and 100 %, respectively. The improvements were attributed to enhancement of soil mineral composition contained in MFGDR. The MFGDR could also improve the soil p hy s i c oc h e m i c a l p r o p e r t i e s a n d de c r e a s e d phytoavailability of heavy metals. The application of MFGDR in agriculture not only was a potential and useful technique for recycling and utilization of FGD residue, but also had potential benefits for soil amelioration, plant growth, and decrease of heavy metals in grown products.

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“…L'utilisation de chaux est très efficace dans les sols fortement contaminés. Elle permet de conserver des pH de 9 à 11 au sein de la matrice sédimentaire, de minimiser la solubilité des métaux présents dans celle-ci, et d'éviter à nouveau leur dissolution (GARCIA et al, 2004). L'évolution de la consistance des sédiments débute dès l'épandage de la chaux avec la fragmentation due au retrait de déshydratation.…”

Section: Thème 7 -Gestion Et Valorisation Des Sédiments Marinsunclassified

Etude de la durabilité d'une valorisation de sédiments marins traités avec différents types de fumée de silice

Silitonga¹,

Mezazigh²,

Levacher³

2010

XIèmes Journées, Les Sables d'Olonne

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Low-grade MgO used to stabilize heavy metals in highly contaminated soils

Cited by 101 publications

References 10 publications

Three-year performance of in-situ solidified/stabilised soil using novel MgO-bearing binders

Three-year performance of in-situ solidified/stabilised soil using novel MgO-bearing binders

The Effects of Modified Flue Gas Desulfurization Residue on Growth of Sweet Potato and Soil Amelioration

Etude de la durabilité d'une valorisation de sédiments marins traités avec différents types de fumée de silice

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