Resumo

RIVERA AMBRIZ, Aldo; ROJAS-SOLIS, Daniel; GARCIA-VILLANUEVA, Luis Antonio  e  LINDIG-CISNEROS, Roberto. Recycled concrete-based technosols: Effects of the source of organic matter, biochar, and inoculation with plant growth promoting bacteria. Rev. Int. Contam. Ambient [online]. 2024, vol.40, 55196.  Epub 17-Mar-2025. ISSN 0188-4999.  https://doi.org/10.20937/rica.55196.

Worldwide, waste from the construction and demolition sector represents 45 to 65% of the waste deposited in final disposal sites, 25% of which is concrete. It is important to seek alternatives to reuse these materials in order to reduce the environmental impact they cause, particularly when they are not disposed of properly. One option is the elaboration of technosols, which require a mineral fraction and a source of organic matter. Due to their synthetic origin, technosols usually have a poorly diverse microbiota. In the present work, technosols were designed from recycled concrete (of two textures) and organic wastes of two origins (wastewater treatment sludge, and compost). The materials were characterized and the growth of Zea mays and Albizia occidentalis was evaluated. In addition, the effect of inoculation with plant growth-promoting bacteria (PGPB) was quantified. Different crystalline structures were found in the concrete, characteristic of this material, including portlandite. The results indicate that the source of organic matter is important for plant performance, particularly for Zea mays, since the best performance was obtained in mixtures with residual sludge as a source of organic matter with coarse-textured concrete. The physical and chemical properties of the technosols and leachates varied according to the composition of the mixtures and the plant species grown. The use of PGPB was beneficial for plant growth.

Palavras-chave : life cycle; restoration; urban cultivation.

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