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Using Electrical Resistivity Tomography (ERT) to Assess the Effectiveness of Capping in Old Unlined Landfills

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Autor(es):
Morita, Alice K. M. ; Pelinson, Natalia S. ; Bastianon, Douglas ; Saraiva, Fernando Augusto ; Wendland, Edson
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: PURE AND APPLIED GEOPHYSICS; v. N/A, p. 8-pg., 2023-10-10.
Resumo

Engineered capping systems are efficient tools for the safety concept for landfills and contaminated land, consisting of multilayer barriers installed at the top of the deposited waste, even years after its closure. The efficiency of such systems is closely associated with avoiding rainwater infiltration into the waste body, a process that can be assessed and monitored with geophysical methods, such as Electrical Resistivity Tomography (ERT). A surface geomembrane capping of approximately 900 m2 was installed over an abandoned unlined landfill in southeastern Brazil and ERT surveys were adopted to assay the effectiveness of the intervention measure. It was possible to verify significantly more resistive regions below the geomembrane and an increase in conductivity values only at approximately 6 m, at the groundwater level of the area. Thus, the reduction of rainwater input possibly, even in the short term, reduces the moisture content and prevents the formation of leachate sheets in unlined landfills, leading the deposit to be more isolated from the surroundings. Lateral flow affected distances as far as 2.5 m from the capping borders, showing that about 70% of the capped area was effectively isolated from the rainfall infiltration. Therefore, capping contributed to reducing leachate production and can be considered an effective method for mitigating impacts from old unlined landfills. (AU)

Processo FAPESP: 15/03806-1 - Disponibilidade hídrica e riscos de contaminação em áreas de afloramento do Sistema Aquífero Guarani
Beneficiário:Edson Cezar Wendland
Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Temático
Processo FAPESP: 18/24615-8 - Efeitos de impermeabilização superficial parcial na mobilização de contaminantes e na degradação microbiana em depósito de resíduos desativado
Beneficiário:Alice Kimie Martins Morita
Modalidade de apoio: Bolsas no Brasil - Doutorado