Lead leachability in stabilized/solidified soil samples evaluated with different leaching tests

Jing, Chuanyong; Meng, Xiaoguang; Korfiatis, George P.

doi:10.1016/j.jhazmat.2004.07.017

Cited by 74 publications

(52 citation statements)

References 24 publications

(43 reference statements)

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“…Some amphoteric elements showed different solubilisation as a function of pH value at the solid -liquid interface (Johnson et al, 1996;Sanchez et al, 2000). In this case the hydroxides precipitate at pH 9 and become the predominant species at pH 11, conversely with pH value higher than 12 these hydroxides are soluble and high amount was found in water samples (Jing et al, 2004). Besides, the Zn excess in solution causes oxidation-reduction processes with Cu(II) forming stable compounds with reduced Cu (Li and Wang, 2003).…”

Section: Characteristics Of Vitrified Fly Ash and Glass-ceramic (Vfa)mentioning

confidence: 99%

In situ remediation of polluted Spolic Technosols using Ca(OH)2 and smectitic marlstone

et al. 2014

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a b s t r a c t a r t i c l e i n f oTechnosols are soils developed on non-traditional substrates and containing large quantities of materials mostly due to intensive human industrial activity, such as artefacts. The increasing number of sites affected by Technosols and their impact on the environment as growing media for plants or as source of pollutants require an understanding of their functioning and evolution, above all the knowledge on the transport of toxic substances from contaminated technogenic soils to groundwater. A case study on properties, remediation and evaluation of Technosols made up by vitrified fly ash and glass-ceramics in Italy was carried out. Original technogenic soils, classified as Spolic Technosols (ecotoxic), were pedotechnically in situ remediated by adding smectitic marlstone and Ca(OH) 2 . Chemical analysis on samples from piezometers showed the presence of harmful heavy metals in groundwater. By means of boreholes and soil profiles the new soils generated, after remediation, were physically and chemically characterized and classified as Spolic Technosols (calcaric). Analysis on soil toxicity and leaching tests showed the effectiveness of the remediation and the mobility reduction of some potentially harmful elements according to the environmental Italian regulation.

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Section: Characteristics Of Vitrified Fly Ash and Glass-ceramic (Vfa)mentioning

confidence: 99%

In situ remediation of polluted Spolic Technosols using Ca(OH)2 and smectitic marlstone

et al. 2014

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“…Conventional S/S treatment with Portland cement and nZVI were also employed as control and the treatment procedure was the same as our previous report [24]. Briefly, COPR samples were mixed with 10% cement (10% C), 25% cement (25% C), 2.5% nZVI (2.5% Fe), 6% nZVI (6% Fe), a series of combinations of 10% cement and 2.5% nZVI (LCLFe), 10% cement and 6% nZVI (LCHFe), 25% cement and 2.5% nZVI (HCLFe), and 25% cement and 6% nZVI (HCHFe), respectively.…”

Section: Sample Preparationmentioning

confidence: 99%

“…In order to achieve complete Cr(VI) reduction and immobilization, sufficient nZVI should be added. Once Cr(VI) in COPR was reduced, cement addition may increase the strength of the solid waste to be used for construction purpose [24].…”

Section: 1 Cr(vi) Immobilizing Efficiencymentioning

confidence: 99%

Reduction and immobilization of chromate in chromite ore processing residue with nanoscale zero-valent iron

et al. 2012

Journal of Hazardous Materials

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Keywords:Chromite ore processing residue (COPR) Nanoscale zero-valent iron (nZVI) X-ray absorption near edge structure (XANES) spectroscopy Chromate leachability Speciation a b s t r a c t Chromite ore processing residue (COPR) poses a great environmental and health risk with persistent Cr(VI) leaching. To reduce Cr(VI) and subsequently immobilize in the solid matrix, COPR was incubated with nanoscale zero-valent iron (nZVI) and the Cr(VI) speciation and leachability were studied. Multiple complementary analysis methods including leaching tests, X-ray powder diffraction, X-ray absorption near edge structure (XANES) spectroscopy, and X-ray photoelectron spectroscopy (XPS) were employed to investigate the immobilization mechanism. Geochemical PHREEQC model calculation agreed well with our acid neutralizing capacity experimental results and confirmed that when pH was lowered from 11.7 to 7.0, leachate Cr(VI) concentrations were in the range 358-445 mg L −1 which contributed over 90% of dissolved Cr from COPR. Results of alkaline digestion, XANES, and XPS demonstrated that incubation COPR with nZVI under water content higher than 27% could result in a nearly complete Cr(VI) reduction in solids and less than 0.1 mg L −1 Cr(VI) in the TCLP leachate. The results indicated that remediation approaches using nZVI to reduce Cr(VI) in COPR should be successful with sufficient water content to facilitate electron transfer from nZVI to COPR.

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“…The leachates were maintained highly acidic by adding nitric acid (pH < 2) to avoid any change in chromium concentration and stored at 48C for metal analysis. The concentration of Cr 16 was determined by Hitachi UV-VIS spectrophotometer at 540 nm [22][23][24][25][26]. …”

Section: Leaching Proceduresmentioning

confidence: 99%

Use of selected industrial waste materials in concrete mixture

Mesci

Çoruh

Ergun

2011

Env Prog and Sustain Energy

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In this study, chromite industry waste and red mud were used in the production of concrete. They were ground and incorporated into concrete with the levels of 5%, 10% and 15% by the weight of binder. Ten mixtures were prepared with different proportions of both the chromite industry waste and the red mud. The experimental results indicate that the mixtures that were ground with 5% chromite industry waste and 5% red mud, substituted with Portland cement gave compressive strength performance similar to that of the reference mixture. A higher percentage of the chromite industry waste and the red mud (15%) replacement yielded lower strength values. The leaching tests that were carried out confirmed that the process makes it possible to obtain materials without major risks for the environment. This study shows that using waste materials in concrete to cost-effective help solve some of the issues with solid waste problems.

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Lead leachability in stabilized/solidified soil samples evaluated with different leaching tests

Cited by 74 publications

References 24 publications

In situ remediation of polluted Spolic Technosols using Ca(OH)2 and smectitic marlstone

In situ remediation of polluted Spolic Technosols using Ca(OH)2 and smectitic marlstone

Reduction and immobilization of chromate in chromite ore processing residue with nanoscale zero-valent iron

Use of selected industrial waste materials in concrete mixture

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