Chemical changes and leachate mass balance of municipal solid waste bottom ash submitted to weathering

Freyssinet, Philippe; Piantone, Patrice; Azaroual, Mohamed; Itard, Y.; Clozel, Blandine; Guyonnet, Dominique; Baubron, Jean-Claude

doi:10.1016/s0956-053x(01)00065-4

Cited by 115 publications

(70 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The leachates instead are always undersaturated as far as Portlandite, Gibbsite and Gypsum, are concerned and which, if present, are subjected to dissolution. These results are partially in agreement with the observations of other researchers on outlet leachates [13] , during a weathering study conducted on a large heap. The obtained aluminum values are lower than the Gibsite and Boehemite solubility, but they are in good agreement with the solubility of microcrystalline Gibsite [20] , or have intermediated values between microcrystalline Gibsite and amorphous alumina.…”

Section: Discussionsupporting

confidence: 93%

“…The calcium concentration is Portlandite controlled only in the zero time leachate, while, in the weathered BA leachates, it is too low to be controlled by the Portlandite or Gypsum dissolution, but too high to depend on the Ettringite dissolution; it therefore does not seem to be due to the dissolution of any of the considered minerals. It could depend on CaCO 3aq complex concentration, in agreement with the suggestions of some researchers [13] , when the system presents pH values near 12. The sulphates concentrations are two orders of magnitude lower than those observed by other researchers [11,12] , even for natural weathered BA with similar values of aluminum [8] .…”

Section: Discussionsupporting

confidence: 90%

“…Changes in mineralogical forms and pH values are likely to affect the leaching of any major and trace elements. The effect of weathering on the leaching of heavy metals and particularly of lead leaching, mainly depends on three different causes: The first and most important is pH decrease as a consequence of carbonation; the second cause is immobilization by adsorption with Fehydroxides [12] : The last is the role of solid solution phenomena and particularly the possibility that lead traces are trapped in calcite deposits [13,14] . Carbonation and the oxidation of metals (Al, Fe) or organic substances are the first reactions in the initial phases of weathering [8] .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Full Scale Tests of Short-Term Municipal Solid Waste Incineration Bottom Ash Weathering Before Landfill Disposal

Marchese¹

2009

American Journal of Environmental Sciences

View full text Add to dashboard Cite

Problem statement: Natural weathering is the most economic method of treatment in order to reduce the release of heavy metals present in the residue. Approach: The aim of the study was to optimize the minimum weathering times that were useful to reduce the lead release to within the Italian limits for landfill disposal. The mechanism of short-term weathering of MSWI bottom ash had been studied and its effect on the leaching of lead had been evaluated. Two bottom ash heaps had been realized for the experimental assessment: In one case an open-air situation was used, in the other, a heap placed under shelter was not exposed to rain. Results: The weathering course was monitored through the results of a leaching test that was carried out at different ageing times (EN 12457-2:2002). The total carbonates were also measured, at the same time, on the fine fraction of the weathered bottom ash (<1 mm). A fast decrease in lead release was observed in the analysis of the leachates and, at the same time, a decrease in pH and calcium concentration. The pH and leachate lead concentration control mechanisms were investigated and individuated. It had been possible to observe that the lead concentration was fundamentally a function of the pH. The Calcite precipitation that occurred from calcium hydroxide carbonation was the main reason for the decrease above all during the first days of the process, when the maximum quantity of CO 2 was fixed by air. The pH value was controlled by Portlandite dissolution only at the beginning, after the pH control seems to be due to aluminum hydroxides. Conclusion: The most significant changes in the bottom ash were found to occur in the first 60 days. It had been possible to verify the limited influence of washing phenomena while it was confirmed that carbonation was the most important process in short-term weathering and that it had an important rule on limiting lead release.

show abstract

Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Full Scale Tests of Short-Term Municipal Solid Waste Incineration Bottom Ash Weathering Before Landfill Disposal

Marchese¹

2009

American Journal of Environmental Sciences

View full text Add to dashboard Cite

show abstract

“…Subtle or systematic uptake of Pb and Zn by carbonates (Freyssinet et al 2002) and of Cr and Se by ettringite (Zhang and Reardon 2003) was observed. However, these elements showed on-going leaching in this study.…”

Section: Leaching Characteristics Of Major Elementsmentioning

confidence: 95%

Simultaneous leaching and carbon sequestration in constrained aqueous solutions

Moon

Cho

Moberly

et al. 2011

Environ Geochem Health

View full text Add to dashboard Cite

The behavior of metal ions' leaching and precipitated mineral phases of metal-rich fly ash (FA) was examined in order to evaluate microbial impacts on carbon sequestration and metal immobilization. The leaching solutions consisted of aerobic deionized water (DW) and artificial eutrophic water (AEW) that was anaerobic, organic- and mineral-rich, and higher salinity as is typical of bottom water in eutrophic algae ponds. The Fe- and Ca-rich FAs were predominantly composed of quartz, mullite, portlandite, calcite, hannebachite, maghemite, and hematite. After 86 days, only Fe and Ca contents exhibited a decrease in leaching solutions while other major and trace elements showed increasing or steady trends in preference to the type of FA and leaching solution. Ca-rich FA showed strong carbon sequestration efficiency ranging up to 32.3 g CO(2)/kg FA after 86 days, corresponding to almost 65% of biotic carbon sequestration potential under some conditions. Variations in the properties of FAs such as chemical compositions, mineral constituents as well as the type of leaching solution impacted CO(2) capture. Even though the relative amount of calcite increased sixfold in the AEW and the relative amount of mineral phase reached 37.3 wt% using Ca-rich FA for 86 days, chemical sequestration did not accomplish simultaneous precipitation and sequestration of several heavy metals.

show abstract

“…It will have some positive effects on decreasing heavy metal leaching [4,5]. Carbonation has been recognized to be an important step in the weathering process [6].…”

Section: Natural Carbonationmentioning

confidence: 99%

Pb stabilization in fresh fly ash from municipal solid waste incinerator using accelerated carbonation technology

Jiang

Chen

Zhang

et al. 2009

Journal of Hazardous Materials

View full text Add to dashboard Cite

Chemical changes and leachate mass balance of municipal solid waste bottom ash submitted to weathering

Cited by 115 publications

References 7 publications

Full Scale Tests of Short-Term Municipal Solid Waste Incineration Bottom Ash Weathering Before Landfill Disposal

Full Scale Tests of Short-Term Municipal Solid Waste Incineration Bottom Ash Weathering Before Landfill Disposal

Simultaneous leaching and carbon sequestration in constrained aqueous solutions

Pb stabilization in fresh fly ash from municipal solid waste incinerator using accelerated carbonation technology

Contact Info

Product

Resources

About