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Environmental potential assessment of MSWI bottom ash-based alkali-activated binders

Abstract: Alkali-activated binders (AABs) stand out as a sustainable alternative to ordinary Portland cement (OPC) as they can be formulated using by-products or waste as raw materials. However, the presence of hazardous compounds in residues can lead to an increase in AABs' toxicity due to the highly alkaline media. Therefore, it is extremely important to evaluate their environmental risks to validate their use as building materials. This study environmentally assessed AABs prepared with two different fractions (0-30 mm and 8-30 mm) of weathered bottom ash (AA-WBA) from WtE plants. The potential leachate toxicity of AA-WBA was assessed using granular and monolithic leaching tests that simulated end-of-life and service life scenarios, respectively. Furthermore, an acute toxicity test with crustacean Daphnia magna as model organisms was conducted to determine the relationship between the leachate metal(loid) concentrations and the ecotoxicity of AA-WBA. The results showed higher metal(loid) concentrations in AA-WBA specimens prepared with the 0-30 mm fraction of WBA. The service life scenario revealed multiple metal(loid)-release mechanisms. The 48 h EC50 value (close to 10%; moderate toxicity) indicated that the use of the coarse fraction of WBA increased the immobilisation of the metal(loid)s. Finally, the correlation between the concentrations of some of the metal(loid)s and toxicity was demonstrated.

 Autoría: Maldonado-Alameda A., Giro-Paloma J., Rodríguez-Romero A., Serret J., Menargues A., Andrés A., Chimenos J.M.,

 Fuente: Journal of Hazardous Materials, 2021, 416, 125828

Editorial: Elsevier

 Fecha de publicación: 15/08/2021

Nº de páginas: 14

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.jhazmat.2021.125828

ISSN: 0304-3894,1873-3336

Proyecto español: BIA2017-83912-C2-1-R

Url de la publicación: https://doi.org/10.1016/j.jhazmat.2021.125828

Autores/as

MALDONADO ALAMEDA, ALEX

GIRÓ PALOMA, JESSICA

ARACELI RODRIGUEZ ROMERO

SERRET SALSE, JOAN

MENARGUES, ÁNGEL

JOSEP MARIA CHIMENOS RIBERA