Options
A novel dry treatment for municipal solid waste incineration bottom ash for the reduction of salts and potential toxic elements
Citation Link: https://doi.org/10.15480/882.3597
Publikationstyp
Journal Article
Date Issued
2021-06-01
Sprache
English
TORE-DOI
TORE-URI
Journal
Volume
14
Issue
11
Article Number
3133
Citation
Materials 14 (11): 3133 (2021-06-01)
Publisher DOI
Scopus ID
Publisher
Multidisciplinary Digital Publishing Institute
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.
Subjects
bottom ash
dry treatment
incineration
municipal solid waste
potential toxic elements
salts
DDC Class
600: Technik
620: Ingenieurwissenschaften
Funding Organisations
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.
Publication version
publishedVersion
Loading...
Name
materials-14-03133-v2.pdf
Size
3.66 MB
Format
Adobe PDF