Comparison of solidification/stabilization of lead contaminated soil between magnesia–phosphate cement and ordinary portland cement under the same dosage

Li, Jiangshan; Xue, Qi‐Kun; Wang, Ping; Zhang, Tingting; Zhang, Ying

doi:10.1002/ep.12204

Cited by 24 publications

(14 citation statements)

References 23 publications

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“…Artificially contaminated soil was used in this test due to its high repeatability and homogeneity. Pb-contaminated soils were obtained by mixing a Pb(NO 3 ) 2 solution with air-dried clean soil until the Pb(NO 3 ) 2 concentration in the soil reached 10000 mg/kg, which represents a universal concentration for Pbcontaminated soil in China [11][12][13]. Deionized water was then added to the contaminated soil until the water content reached 23.5% (optimum moisture content).…”

Section: Preparation Of Pb-contaminated Soilmentioning

confidence: 99%

Mechanical Properties and Leaching Characteristics of Geopolymer‐Solidified/Stabilized Lead‐Contaminated Soil

Zhang

Jia

et al. 2019

Advances in Civil Engineering

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Ordinary Portland cement (OPC) is widely used in the solidification/stabilization of Pb-contaminated soils. However, many studies have suggested that the high content of Pb would degrade the mechanical properties of OPC-solidified/stabilized soils. is paper presents a new binder, geopolymer fine aggregate (GFA), composed of ground granulated blast furnace slag, fly ash, CaO, and Na 2 SiO 3 . For comparison, OPC was used as a conventional binder. Mechanical properties and leaching characteristics are typically used to evaluate the effects of binders on solidified/stabilized soils. Nevertheless, limited information on the mechanical properties and leaching characteristics of the GFA-solidified/stabilized soils is available. is study thus investigated the mechanical properties and leaching characteristics of geopolymer-solidified/stabilized Pb-contaminated soil. Unconfined compressive strength test, permeability test, synthetic precipitation leaching procedure, simplified bioaccessibility extraction, phytoavailability extraction (with diethylene-triamine penta-acetic acid), sequential extraction procedure, mercury intrusion porosimetry, and scanning electron microscopy (SEM) were performed on OPC-and GFA-solidified/stabilized soil. e results showed that the GFA presented a better effect on the mechanical properties and leachability of the solidified/stabilized soils than the OPC-solidified/stabilized soils. e GFA-solidified/stabilized soil displayed considerably lower leachability, bioaccessibility, and phytoavailability of Pb and higher mechanical properties and chemical stability than the OPC counterpart. is study demonstrated that GFA had a better effect than OPC on the solidification/stabilization of Pb-contaminated soils.

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Section: Preparation Of Pb-contaminated Soilmentioning

confidence: 99%

Mechanical Properties and Leaching Characteristics of Geopolymer‐Solidified/Stabilized Lead‐Contaminated Soil

Zhang

Jia

et al. 2019

Advances in Civil Engineering

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“…The detailed description of the physical characterization of the raw soil and Cr(VI)-contaminated soil are presented in Table 1, which was obtained according to the "Standard for soil test method" of China. The Light Proctor compaction method was used for the compaction test [16,17]. Cr(VI)-contaminated soils were obtained by adding K 2 Cr 2 O 7 solution until the Cr(VI) content in the soil reached 1000 mg/kg, which represents a universal content for Cr(VI)-contaminated soil in China [18][19][20][21][22].…”

Section: Cr(vi) Contaminated Soil Preparationmentioning

confidence: 99%

Leachability and Stability of Hexavalent-Chromium-Contaminated Soil Stabilized by Ferrous Sulfate and Calcium Polysulfide

2018

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Ferrous sulfate (FeSO4) and calcium polysulfide (CaS5) stabilization are practical approaches to stabilizing hexavalent chromium (Cr(VI))-contaminated soil. The leachability and stability of Cr(VI) and Cr are important factors affecting the effectiveness of stabilized Cr(VI)-contaminated soil. This study compared the leachability and stability of Cr(VI) and Cr in Cr(VI)-contaminated soil stabilized by using FeSO4 and CaS5. The contaminated soil was characterized before and after stabilization, and the effectiveness of FeSO4 and CaS5 stabilization was assessed using leaching, bioaccessibility, alkaline digestion, sequential extraction, and X-ray diffraction tests. Results showed that FeSO4 and CaS5 significantly reduced the leachability and Cr(VI) content in the contaminated soil. The acid-buffering capacity and stability (leachability, bioaccessibility, speciation distribution, and mineral composition) of the Cr(VI)/Cr and Cr(VI) content of CaS5 were better than those of FeSO4. This study demonstrated that CaS5 had a better effect than FeSO4 on the stabilization of Cr(VI) in Cr(VI)-contaminated soil. The CaS5 significantly enhanced the stabilization and immobilization of Cr(VI) and reduced its leachability and toxicity.

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“…However, the energy intensive process and a global warming potential material have made the use of OPC for this purpose being disadvantage. Waste residues with composition similar to that of OPC are therefore receiving an increase interest recently as alternative solidification binders .…”

Section: Introductionmentioning

confidence: 99%

Alkali‐activated composites of calcium carbide and black rice husk ash for immobilizing electroplating sludge

Piyaphanuwat

Asavapisit

2018

Env Prog and Sustain Energy

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This study investigated the use of two waste products, black rice husk ash (BHA) from biomass power plants and calcium carbide residue (CCR) from acetylene gas production as an alkali‐activated binder to solidify and stabilize the heavy metal plating sludge (PS) from electroplating plants. Optimum strength of the alkali‐activated product was obtained using a weight percentage ratio of CCR to BHA of 60:40. CCR‐BHA compacts containing 50 wt % PS developed strength after 3 days, but the addition of 2 wt % Na2SiO3 or 4 wt % Na2CO3 developed strength in all the samples after 1 day. The CCR‐BHA paste containing 50 wt % PS developed a 7‐day strength >0.35 MPa in the sample containing 4 wt % Na2SiO3 and the same strength was developed after 3 days in the sample containing 4 wt % Na2CO3. The Cr concentration of leachate from all the samples was greater than the regulatory limit except for the CCR‐BHA paste containing 50 wt % PS and 4 wt % Na2CO3. After contacted all samples with synthetic acid rain, less corroded surface was observed from sample containing Na2SiO3 and Na2CO3. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

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Comparison of solidification/stabilization of lead contaminated soil between magnesia–phosphate cement and ordinary portland cement under the same dosage

Cited by 24 publications

References 23 publications

Mechanical Properties and Leaching Characteristics of Geopolymer‐Solidified/Stabilized Lead‐Contaminated Soil

Mechanical Properties and Leaching Characteristics of Geopolymer‐Solidified/Stabilized Lead‐Contaminated Soil

Leachability and Stability of Hexavalent-Chromium-Contaminated Soil Stabilized by Ferrous Sulfate and Calcium Polysulfide

Alkali‐activated composites of calcium carbide and black rice husk ash for immobilizing electroplating sludge

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