Abstract
Conventional bottom ash (BA) management consists of a solidification process using inorganic binder reagents, such as cement. However, despite the heavy metal content, the use of BA as a natural aggregate has become increasingly more common. In particular, bottom ash is used as a raw material for clinker, cement mortar or frit production, as a drainage layer in landfills or as a sub-base material in road construction. In this study, the life cycle assessment approach was used to evaluate and compare ash solidification with ash recycling in Portland cement production as a clinker and gypsum substitute. The findings showed that the substitution of ash for clinker resulted in the lowest natural resources (NR) consumption and the lowest environmental burdens (EB). The decrease in the clinker substitution percentage generated a higher NR consumption and an increased EB. In ash recycling, the distance between the incinerator and the cement facility is an important parameter in the decision-making process. Specifically, ash solidification presented less favourable results than ash recycling (with a clinker substitution of 25 %), despite the increasing distance between the incinerator and the cement facility. However, when the clinker substitution decreased to 2.5 % or when ash was substituted for gypsum, the distance played an important role in the water impact.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the project FENIX-Giving Packaging a New Life.
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The authors do not have any potential conflict of interest to declare.
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Margallo, M., Aldaco, R. & Irabien, Á. Environmental management of bottom ash from municipal solid waste incineration based on a life cycle assessment approach. Clean Techn Environ Policy 16, 1319–1328 (2014). https://doi.org/10.1007/s10098-014-0761-4
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DOI: https://doi.org/10.1007/s10098-014-0761-4