heavy metals, adsorption, sorbent, zeolite, bottom ash, sediment
Municipal solid waste incinerator (MSWI) bottom ash (BA) was converted to zeolitic-type adsorbent materials by hydrothermal conversion under strongly alkaline conditions. The conversion product was determined to be a mixture of sodium aluminum silicate hydrate (SASH) (Na2O·Al2O3·1.68SiO2·1.73H2O) and tobermorite (Ca5Si6O16(OH)2·4H2O). The BET specific surface area was 22.1 m2/g, which represented a significant gain compared to the BA (4.6 m2/g) due to the formation of micropores and mesopores. The converted BA demonstrated promising performance for application as a sorbent towards several heavy metals (oxyanions of As(V), and Cd2+, Co2+, Ni2+, Pb2+, and Zn2+). Its performance was found to be generally superior to that of a mainly-clinoptilolite natural zeolite, achieving greater sorption extents and better stabilizing capability of contaminated sediments. At a lower dosage rate (50 mg sorbent per gram sediment) to that of natural zeolite, converted BA achieved greater than 80% reduction of cationic heavy metal concentrations in sediment porewater. These results suggest a promising route for reutilization of MSWI-BA, which can greatly enhance the sustainability of waste incineration technology.
Faculty of Applied Science & Technology
School of Chemical and Environmental Sciences
Peer Reviewed/Refereed Publication
© 2011 Elsevier B.V. All rights reserved.
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Original Publication Citation
Chiang, Y. W., Ghyselbrecht, K., Santos, R. M., Meesschaert, B., & Martens, J. A. (2012). Synthesis of Zeolitic-type Adsorbent Material From Municipal Solid Waste Incinerator Bottom Ash and Its Application in Heavy Metal Adsorption. Catalysis Today, 190(1), 23-30. doi:10.1016/j.cattod.2011.11.002
Santos, Rafael M.; Chiang, Yi Wai; Ghyselbrecht, Karel; Meesschaert, Boudewijn D.; and Martens, Johan A., "Synthesis of Zeolitic-type Adsorbent Materials from Municipal Solid Waste Incinerator Bottom Ash and its Application in Heavy Metal Adsorption" (2012). Faculty Publications and Scholarship. 10.