Calcite buffer effects in electrokinetic remediation of clopyralid-polluted soils

Autor(es)

Lopez-Vizcaino, R. ^{[1, 2]} ; dos Santos, E. V. ^[3] ; Yustres, A. ^[2] ; Rodrigo, M. A. ^[4] ; Navarro, V. ^[2] ; Martinez-Huitle, C. A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Rio Grande do Norte, Inst Chem, Campus Univ, BR-59078970 Natal, RN - Brazil

^[2] Univ Castilla La Mancha, Civil Engn Sch, Geoenvironm Grp, Avda Camilo Jose Cela S-N, E-13071 Ciudad Real - Spain

^[3] Univ Fed Rio Grande do Norte, Sch Sci & Technol, Campus Univ, BR-59078970 Natal, RN - Brazil

^[4] Univ Castilla La Mancha, Fac Chem Sci & Technol, Dept Chem Engn, Campus Univ S-N, E-13071 Ciudad Real - Spain

• Tipo de documento: Artigo Científico
• Fonte: Separation and Purification Technology; v. 212, p. 376-387, APR 1 2019.
• Citações Web of Science: 0

Resumo

This work presents a study of the dissolution-precipitation processes of calcite in soil undergoing electrokinetic remediation processes. For this purpose, a numerical inspection of one of these processes in a calcareous soil (10% calcite content) contaminated with an of the organochlorine acid herbicide (3,6-dichloro-2-pyridinecarboxylic acid) was carried out. The numerical tool used to perform this analysis was the Multiphysics for EKR (M4EKR), a module programmed by the authors in the COMSOL Multiphysics platform. A detailed analysis of the pH, the distribution of species that have a significant influence on soil buffering capacity (carbonates and calcite), as well as the pollutant, has been performed. In this way, the kinetics of the calcite dissolution-precipitation processes have been analysed in order to determine the pH of the water in the pores and, therefore, how it directly affects the effectiveness of the treatment. Additionally, a sensitivity analysis of the selected EKR process has been carried out at different values of the rate of calcite dissolution due to the uncertainty associated with the reactive surface area parameter. (AU)

• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático