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A Novel Dry Treatment for Municipal Solid Waste Incineration Bottom Ash for the Reduction of Salts and Potential Toxic Elements
- 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 pilotscale 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 andThe 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 pilotscale 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.…
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| Autor*innen: | M. Abis, M. Bruno, Franz-Georg SimonORCiD, R. Grönholm, M. Hoppe, K. Kuchta, S. Fiore |
|---|---|
| Dokumenttyp: | Zeitschriftenartikel |
| Veröffentlichungsform: | Verlagsliteratur |
| Sprache: | Englisch |
| Titel des übergeordneten Werkes (Englisch): | Materials |
| Jahr der Erstveröffentlichung: | 2021 |
| Organisationseinheit der BAM: | 4 Material und Umwelt |
| 4 Material und Umwelt / 4.3 Schadstofftransfer und Umwelttechnologien | |
| Veröffentlichende Institution: | Bundesanstalt für Materialforschung und -prüfung (BAM) |
| Verlag: | MDPI |
| Verlagsort: | Basel |
| Jahrgang/Band: | 14 |
| Ausgabe/Heft: | 11 |
| Erste Seite: | 3133 |
| DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Sanitär- und Kommunaltechnik; Umwelttechnik |
| Freie Schlagwörter: | Bottom ash; Dry treatment; Potential toxic elements; Salts |
| Themenfelder/Aktivitätsfelder der BAM: | Umwelt |
| Umwelt / Circular Economy | |
| DOI: | 10.3390/ma14113133 |
| URN: | urn:nbn:de:kobv:b43-527963 |
| ISSN: | 1996-1944 |
| Verfügbarkeit des Dokuments: | Datei für die Öffentlichkeit verfügbar ("Open Access") |
| Lizenz (Deutsch): |  Creative Commons - CC BY - Namensnennung 4.0 International |
| Datum der Freischaltung: | 10.06.2021 |
| Referierte Publikation: | Ja |
| Datum der Eintragung als referierte Publikation: | 05.07.2021 |
| Schriftenreihen ohne Nummerierung: | Wissenschaftliche Artikel der BAM |
