Stabilization/solidification of lead-contaminated soil using cement and rice husk ash

Yin, Chunyang; Mahmud, Hilmi Bin; Shaaban, Ghazaly

doi:10.1016/j.jhazmat.2006.05.013

Cited by 124 publications

(37 citation statements)

References 5 publications

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“…Considering the largely alkaline pH of the cement solutions and the Pourbaix-type diagrams, the geochemical modelling carried out in some previous works reported the formation of hydroxylated and hydroxycarbonated compounds as the phases with the highest likelihood to be found [38]. Additionally, for example, in the presence of Pb, hydrocerussite (Pb 3 (CO 3 ) 2 (OH) 2 ) [38] and Pb(OH) 2 [39][40][41][42] were found. Therefore, in the current work, it could be reasonably expected the formation of small amounts of similar hydroxylated and hydroxycarbonated compounds of Cu and Pb.…”

Section: Sorption Studiesmentioning

confidence: 98%

Solidification/stabilization of toxic metals in calcium aluminate cement matrices

Navarro-Blasco

Durán

Sirera

et al. 2013

Journal of Hazardous Materials

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The ability of calcium aluminate cement (CAC) to encapsulate toxic metals (Pb, Zn and Cu) was assessed under two curing conditions. Changes in the consistency and in the setting time were found upon the addition of the nitrates of the target metals. Both Pb and Cu caused a delay in CAC hydration, while Zn accelerated the stiffening of the mortar. Compressive strengths of the metal-doped mortars, when initially cured at 60ºC/100% RH, were comparable with that of the free-metal mortar. Three different pore size distribution patterns were identified and related to the compounds identified by XRD and SEM. Sorbent capacities of CAC for the toxic metals were excellent: a total uptake was achieved for up to 3 wt.% loading of the three metals. In this way, CAC mortars were perfectly able to encapsulate the toxic metals, allowing the use of CAC for waste management as proved by the leaching tests.

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Section: Sorption Studiesmentioning

confidence: 98%

Solidification/stabilization of toxic metals in calcium aluminate cement matrices

Navarro-Blasco

Durán

Sirera

et al. 2013

Journal of Hazardous Materials

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“…On the other hand, pH exerts -at the same time -a strong influence over the speciation of the metals. At pH 7, the majority of the Zn appears as Zn 2+ , while at pH 8 small percentages of Zn(OH) + and Zn(OH) 2 have also been reported [34]. This last species of Zn cannot be complexed by the carboxylate groups of the polymer.…”

Section: Leaching Tests Of Heavy Metals In Cmch-modified Cement Mortarsmentioning

confidence: 99%

“…heavy metals) by immobilizing them [1,2]. As a result of the chemical properties of the cement, the solidification/stabilization (S/S) processes may involve both physical entrapment (adsorption) and/or chemical binding (complexation) of the contaminant to the cement matrix.…”

Section: Introductionmentioning

confidence: 99%

“…As CMCH at neutral or alkaline pH deprotonates giving rise to carboxylate groups, cationic forms of heavy metal would be able to be retained by the polymer. In this sense, pH 7 turns out to be the limit for the 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 7 appearance of Pb 2+ , as from this pH onwards it starts to precipitate as Pb(OH) 2 and cannot be chelated. On the other hand, pH 8.25 is the limit for the Zn 2+ presence.…”

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confidence: 99%

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Interaction of carboxymethylchitosan and heavy metals in cement media

Lasheras-Zubiate

Navarro-Blasco

Álvarez

et al. 2011

Journal of Hazardous Materials

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The performance of an etherified chitosan, carboxymethyl chitosan (CMCH), when added to cement mortars doped with heavy metals, was assessed. In the presence of heavy metals (Cr, Pb, Zn) strong modifications of the fresh-state properties were evaluated. The addition of the polymer was seen to be useful in minimising some of these modifications, as those related to the setting time. A competitive mechanism for adsorption between the oxoanionic form of the metals and the carboxylate groups of the chitosan derivative was established. Studies on the metal chelating ability of the polymer and leaching from the hardened specimens showed scarce complexation under alkaline conditions, pointing to physical entrapment based on metal adsorption. However, significant chelation of metals was proved at near-neutral pH, suggesting the potential usefulness of the polymer as a agent for removing heavy metals from polluted waters and subsequently immobilizing them in cement mortars. Leaching tests carried out on polymer-metal complex-bearing samples showed a significant reduction in the amount of released Pb and Zn.

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“…Compressive strength as a function of added zinc concentrations [24] 图3. 锌离子浓度对水泥固化淤泥的强度影响术处理后的废弃物(堆放至填埋场内时)的渗透系数， US EPA [24] 推荐其必须比周围物质小到至少2个数量级(见图6)。目前尚没有关于固化/稳定技术处理的重图4. 铅离子浓度对水泥固化淤泥的强度的影响 [22] Figure 5.…”

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Study on Heavy Metal Contaminated Soils Dealt with Cement Solidification/Stabilization

翟¹

2014

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Abstract:With the sustainable development of economy in China, environmental pollution is aggravated constantly and the soil in city is polluted severely. Heavy metal ions in soil may lead to the change in soil engineering properties. Their leakage would also harm the surrounding environment. Currently the cement solidification technology is a useful method of solidifying and stabilizing heavy metal contaminated soils. Different heavy metal types and contents, cement contents and curing time will bring different influences on strength and deformation properties of solidified contaminated soils.

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Stabilization/solidification of lead-contaminated soil using cement and rice husk ash

Cited by 124 publications

References 5 publications

Solidification/stabilization of toxic metals in calcium aluminate cement matrices

Solidification/stabilization of toxic metals in calcium aluminate cement matrices

Interaction of carboxymethylchitosan and heavy metals in cement media

Study on Heavy Metal Contaminated Soils Dealt with Cement Solidification/Stabilization

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