A Mechanochemical Route to Magnesium/Calcium Citrate Formation for Chrysotile/Asbestos Cement Correct Disposal as Agricultural Input

Author(s)

Borges, Roger ; do Amaral, Lilian Fernanda Martins ; Ribeiro, Vitoria Palhares ; de Oliveira- Paiva, Christiane Abreu ; Wypych, Fernando ; Ribeiro, Caue

• Document type: Journal article
• Source: WASTE AND BIOMASS VALORIZATION; v. N/A, p. 11-pg., 2022-12-03.

Abstract

Here, we propose a mechanochemical route to manage the disposal of asbestos fibers material from raw chrysotile and asbestos cement, using it as a nutrient source for agriculture. The mechanochemical process, using citric acid as a reactant, led to the fibers' disruption. The constant mixing, the reactants' friction, and the ion migration enabled the formation of calcium/magnesium citrates. Through soil incubation and enzymatic profile analyses, we showed the beneficial effect of these products as readily available carbon to stimulate endogenous microbiota, releasing Ca2+/Mg2+ to correct acid soil pH. The results evidence the potential of these citrates to promote an acidic buffer to the soil and, after their microbiological decomposition, their equivalent effect to commercial limestone for soil pH correction. (AU)

• FAPESP's process: 16/10636-8 - From the cell factory to the Biodiesel-Bioethanol integrated biorefinery: a systems approach applied to complex problems in micro and macroscales
• Grantee: Roberto de Campos Giordano
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants
• FAPESP's process: 18/10104-1 - Nanocomposites Preparation from Urea modified with Glycerol for optimization of Process of Controlled Release of Nutrients
• Grantee: Amanda Soares Giroto
• Support Opportunities: Scholarships in Brazil - Post-Doctoral