Comparison of calcium carbonate production by bacterial isolates from recycled aggregates.

Autor: Moita GC; Department of Civil Engineering, COPPE, Federal University of Rio de Janeiro, Av. Athos da Silveira Ramos, Rio de Janeiro, RJ, 21941-972, Brazil., da Silva Liduino V; School of Chemistry, Federal University of Rio de Janeiro, Av. Athos da Silveira Ramos, Rio de Janeiro, RJ, 21941-972, Brazil., Sérvulo EFC; School of Chemistry, Federal University of Rio de Janeiro, Av. Athos da Silveira Ramos, Rio de Janeiro, RJ, 21941-972, Brazil., Bassin JP; Department of Chemical Engineering, COPPE, Federal University of Rio de Janeiro, Av. Athos da Silveira Ramos, Rio de Janeiro, RJ, 21941-972, Brazil., Toledo Filho RD; Department of Civil Engineering, COPPE, Federal University of Rio de Janeiro, Av. Athos da Silveira Ramos, Rio de Janeiro, RJ, 21941-972, Brazil. toledo@coc.ufrj.br.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 May; Vol. 31 (25), pp. 37810-37823. Date of Electronic Publication: 2024 May 24.
DOI: 10.1007/s11356-024-33750-8
Abstrakt: The new technology of microbially induced calcium carbonate precipitation (MICP) has been applied in construction materials as a strategy to enhance their properties. In pursuit of solutions that are more localized and tailored to the study's target, this work focused on isolating and selecting bacteria capable of producing CaCO 3 for posterior application in concrete aggregates. First, eleven bacterial isolates were obtained from aggregates and identified as genera Bacillus, Lysinibacillus, Exiguobacterium, and Micrococcus. Then, the strains were compared based on the quantity and nature of calcium carbonate they produced using thermogravimetric analysis, X-ray diffraction, and scanning electron microscopy with energy dispersive spectroscopy. Bacillus sp. dominated the cultured isolates and, along with Lysinibacillus sp., exhibited the highest CaCO 3 conversion (up to 80%). On the other hand, Exiguobacterium and Micrococcus genera showed the poor ability to MICP (21.3 and 20.3%, respectively). Calcite and vaterite were the dominant carbonate polymorphs, with varying proportions. Concrete aggregates have proven to be a source of microorganisms capable of producing stable calcium carbonates with a high conversion rate. This indicates the feasibility of using microorganisms derived from local sources for application in construction materials as a sustainable way to enhance their characteristics.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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