Long-term prediction of the leaching behavior of pollutants from solidified wastes

Tiruta-Barna, Ligia; Imyim, Apichat; Barna, Radu

doi:10.1016/s1093-0191(03)00042-x

Cited by 57 publications

(29 citation statements)

References 11 publications

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“…However, when chemical equilibrium models are needed to introduce into dynamic leaching models (coupled chemical/transport model), a mathematical equation is required. To solve this problem, some authors consider simple empirical models: the simplest case is to consider a polynomial equation, such as that used by Tiruta-Barna et al [20] for lead solubilization in a synthetic waste stabilized with cement:…”

Section: Resultsmentioning

confidence: 99%

Modeling of zinc solubility in stabilized/solidified electric arc furnace dust

Fernández-Olmo

Lasa

Irabien

2007

Journal of Hazardous Materials

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Section: Resultsmentioning

confidence: 99%

Modeling of zinc solubility in stabilized/solidified electric arc furnace dust

Fernández-Olmo

Lasa

Irabien

2007

Journal of Hazardous Materials

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“…The C-S-H gels have been known as the naturally existed geological forms characterized of a high persistence for a long time (Tiruta-Barna et al 2004). These gels have been a part of cement chemistry and were created during the solidification process.…”

Section: Resultsmentioning

confidence: 99%

Investigating the chemical stabilization of hazardous waste material (fly ash) encapsulated in Portland cement

Sobiecka

2013

Int. J. Environ. Sci. Technol.

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Portland cement has been suggested as an effective stabilization (physico-chemical) method for hazardous waste. This research explored the immobilization of metals in various mixtures of Portland cement and fly ash waste sampled from coal power plant in the province of Lodz, central Poland. The stabilization of fly ash in Portland cement was investigated under a wide range of pH conditions (3-12). Leachability tests were used to determine the efficiency of the encapsulation by studying the dissolution of alkaline metals (sodium, potassium) and alkaline earth metals (calcium, magnesium). The lowest value of leached metals was obtained for ratio of ash to cement of 1:10 in a case of sodium and calcium, while ratio 1.5 gave the lowest leached effects for potassium and magnesium. The high effectiveness of solidification/stabilization process was gained in high pH values (9-11).

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“…The concentration of Na in the leachates was immediately high at the initial high pH of the ANC systems showing the high solubility of Na in ash residues, and this high concentration was maintained irrespective of the pH of the systems. The trends of release of Na in the ANC systems suggest the rapid dissolution of any transient Na-rich soluble salts such as halite (NaCl) or Na 2 SO 4 (Wang et al 2010;Quina et al 2009;Tiruta-Barna et al 2004) that may have formed in the ash residues during the long-term fly ash-brine interaction experiments. The release of significant amounts of Na at the initial high pH of the ANC systems is an indication that the Na removed from the brine solution by the fly ashes during the long-term fly ash-brine interaction experiments is highly mobile immediately on contact with water.…”

Section: Magnesium Potassium Sodium and Chloridementioning

confidence: 99%

Long-term brine impacted fly ash, Part II: Mobility of major species in the ash residues

Fatoba

Petrik

Akinyeye

et al. 2013

Int. J. Environ. Sci. Technol.

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The leaching of major species from fly ash is a function of the pH of the solution in contact with the fly ash. The aim of this study was to determine the effect of the pH of the leachant on the leaching of species from the ash residues recovered after the long-term fly ash-brine interactions. Acid neutralization capacity (ANC) tests using solutions of different pH values ranging from the initial pH of the ash residues (11-12) to pH 4 were employed in the leaching experiments. The ANC tests revealed that the release of major species from the ash residues depended on the pH of the leachants except for Na and Cl, where the significant concentrations leached were independent of the solution pH. The concentrations of Al and Si in the ANC leachates were very high at pH below 6 while Ca, K, Sr, Mg and B were immediately mobilized from the brine impacted fly ash when in contact with de-ionized water, and leaching increased as the pH decreased. The concentration of SO 4 leached from the brine impacted ash residues at high pH was high, and the leaching increased with decrease in the pH of the leachant. This study shows that most of the major elements captured in the ash residues could be mobilized when in contact with aqueous solutions of various pH. This reveals that the co-disposal of fly ash and brine may not be the best practice as the major elements captured in the ash residues could leach over time.

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Long-term prediction of the leaching behavior of pollutants from solidified wastes

Cited by 57 publications

References 11 publications

Modeling of zinc solubility in stabilized/solidified electric arc furnace dust

Modeling of zinc solubility in stabilized/solidified electric arc furnace dust

Investigating the chemical stabilization of hazardous waste material (fly ash) encapsulated in Portland cement

Long-term brine impacted fly ash, Part II: Mobility of major species in the ash residues

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