Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.3597
Publisher DOI: 10.3390/ma14113133
Title: A novel dry treatment for municipal solid waste incineration bottom ash for the reduction of salts and potential toxic elements
Language: English
Authors: Abis, Marco 
Bruno, Martina 
Simon, Franz-Georg 
Grönholm, Raul 
Hoppe, Michel 
Kuchta, Kerstin 
Fiore, Silvia 
Keywords: bottom ash;dry treatment;incineration;municipal solid waste;potential toxic elements;salts
Issue Date: 7-Jun-2021
Publisher: Multidisciplinary Digital Publishing Institute
Source: Materials 14 (11): 3133 (2021)
Journal: Materials 
Abstract (english): 
The main obstacle to bottom ash (BA) being used as a recycling aggregate is the content of salts and potential toxic elements (PTEs), concentrated in a layer that coats BA particles. This work presents a dry treatment for the removal of salts and PTEs from BA particles. Two pilot-scale abrasion units (with/without the removal of the fine particles) were fed with different BA samples. The performance of the abrasion tests was assessed through the analyses of particle size and moisture, and that of the column leaching tests at solid-to-liquid ratios between 0.3 and 4. The results were: the particle-size distribution of the treated materials was homogeneous (25 wt % had dimensions <6.3 mm) and their moisture halved, as well as the electrical conductivity of the leachates. A significant decrease was observed in the leachates of the treated BA for sulphates (44%), chlorides (26%), and PTEs (53% Cr, 60% Cu and 8% Mo). The statistical analysis revealed good correlations between chloride and sulphate concentrations in the leachates with Ba, Cu, Mo, and Sr, illustrating the consistent behavior of the major and minor components of the layer surrounding BA particles. In conclusion, the tested process could be considered as promising for the improvement of BA valorization.
URI: http://hdl.handle.net/11420/9730
DOI: 10.15480/882.3597
ISSN: 1996-1944
Other Identifiers: doi: 10.3390/ma14113133
Institute: Umwelttechnik und Energiewirtschaft V-9 
Document Type: Article
Funded by: Bundesministerium für Bildung und Forschung 
More Funding information: The authors would like to acknowledge the financial support to the project BASH-Treat (ID 157) provided by the ERA-MIN2 Research & Innovation Programme on Raw Materials to Foster Circular Economy, by the German Federal Ministry of Education and Research (BMBF, FKZ 033RU005 A-C) and by the Italian Ministry of University and Research (MIUR). The authors are thankful to project partners Heidemann Recycling GmbH and Sysav Utveckling AB.
Project: BASH 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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