Influence of Carbonation on Leaching of Cementitious Wasteforms

Shafique, Sazzad Bin; Walton, John C.; Gutierrez, Neyda; Smith, Robert W.; Tarquin, Anthony J.

doi:10.1061/(asce)0733-9372(1998)124:5(463)

Cited by 58 publications

(31 citation statements)

References 16 publications

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“…In hydrated systems, they are moderately mobilised due to the lowering of the pH, although their concentration in the leachates is below the regulation limits [5,10]. These metals form either hydroxi-carbonates or carbonates that deposit on the calcium silicate minerals [1,10].…”

Section: Cumentioning

confidence: 98%

“…On the other hand, carbonation has been demonstrated to act positively in the immobilisation of heavy metal-contaminated soils and other residues [1][2][3][4][5]. In this patented application [6,7], the use of carbonation has been used to overcome the inhibiting effects of complex waste materials on the hydraulic and pozzolanic reactions responsible for effective solidification [6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A review of accelerated carbonation technology in the treatment of cement-based materials and sequestration of CO2

Bertos

Simons

Hills

et al. 2004

Journal of Hazardous Materials

807

207

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Section: Cumentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

A review of accelerated carbonation technology in the treatment of cement-based materials and sequestration of CO2

Bertos

Simons

Hills

et al. 2004

Journal of Hazardous Materials

807

207

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“…The carbonation of the cemented materials was responsible for the adsorption of the heavy metals and other pollutants present in the samples. 22,23 Similarly, our batch experiments also showed that ALC effectively adsorbed several heavy metals from synthetic leachate. 20 Interestingly, the adsorption rate of the heavy metals increased in the presence of ZVI and anaerobic municipal sludge.…”

Section: Resultsmentioning

confidence: 64%

Removal of mixed contaminants by Fe0-based biobarrier in flow-through columns using recycled waste materials

Lee

Youm

Choi

et al. 2009

J Mater Cycles Waste Manag

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The present study investigated the reactivity and ability of permeable reactive barriers [zero-valent iron (ZVI)-barrier plus biobarrier) to remove various contaminants (Cd, As, Zn, Cu, Mn, Cr, NO 3 − , NH 4 + , and COD cr ) from synthetic leachate. Two different reactive materials were used in this study, namely ZVI and autoclaved lightweight concrete (ALC). After 90 days of column operation, the contaminant profi les were determined along the length of the columns. The heavy metals were extensively removed in the bio-ALC and sequential barriers (ZVI plus bio-ALC), however the removal effi ciencies for the heavy metals Zn and Cr in the ALC and bio-ALC barriers were comparatively low. Nitrate was completely removed (>99.9%) in the ALC, bio-ALC, and sequential barriers. More than 50% of the produced ammonium and organic materials were removed in the biologically reactive zone of the sequential barriers. The results of the present study suggest that sequential barriers are one of the best solutions for in situ remediation and that they can be applied to clean up the leachate released from landfi lls.

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“…Papadakis et al 1991;Johanneson and Utgenannt 2001;Short et al 2001;Van Balen 2005). More recently, research has also focused on accelerated carbonation treatment of cement-bound waste to promote the stabilization degree and improve the leaching behaviour of the treated material (Lange et al 1996;Bin-Shafique et al 1998;Van Gerven et al 2006). The CO 2 sequestration potential of concrete demolition waste has also been lately studied (Shtepenko et al 2005;Stolaroff et al 2005).…”

Section: Mineral Carbonationmentioning

confidence: 95%

Current status and perspectives of accelerated carbonation processes on municipal waste combustion residues

Costa

Baciocchi

Polettini

et al. 2007

Environ Monit Assess

154

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The increasing volumes of municipal solid waste produced worldwide are encouraging the development of processes to reduce the environmental impact of this waste stream. Combustion technology can facilitate volume reduction of up to 90%, with the inorganic contaminants being captured in furnace bottom ash, and fly ash/APC residues. The disposal or reuse of these residues is however governed by the potential release of constituent contaminants into the environment. Accelerated carbonation has been shown to have a potential for improving the chemical stability and leaching behaviour of both bottom ash and fly ash/APC residues. However, the efficacy of carbonation depends on whether the method of gas application is direct or indirect. Also important are the mineralogy, chemistry and physical properties of the fresh ash, the carbonation reaction conditions such as temperature, contact time, CO(2) partial pressure and relative humidity. This paper reviews the main issues pertaining to the application of accelerated carbonation to municipal waste combustion residues to elucidate the potential benefits on the stabilization of such residues and for reducing CO(2) emissions. In particular, the modification of ash properties that occur upon carbonation and the CO(2) sequestration potential possible under different conditions are discussed. Although accelerated carbonation is a developing technology, it could be introduced in new incinerator facilities as a "finishing step" for both ash treatment and reduction of CO(2) emissions.

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Influence of Carbonation on Leaching of Cementitious Wasteforms

Cited by 58 publications

References 16 publications

A review of accelerated carbonation technology in the treatment of cement-based materials and sequestration of CO2

A review of accelerated carbonation technology in the treatment of cement-based materials and sequestration of CO2

Removal of mixed contaminants by Fe0-based biobarrier in flow-through columns using recycled waste materials

Current status and perspectives of accelerated carbonation processes on municipal waste combustion residues

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