Produção Nacional
Enhance electrokinetic remediation of potentially toxic elements in the dredged sediment of Camorim Lagoon
2024; Brazilian Association of Sanitary and Environmental Engineering; Volume: 29; Linguagem: Inglês
10.1590/s1413-41522024025
ISSN1809-4457
AutoresAlejandra Daniela Delgado Vallejo, José Tavares Araruna Júnior, Rodrigo Araújo Gonçalves, Rodrigo Fernandes Magalhães de Souza, Shuguang Liu, Hongtao Wang,
Tópico(s)Geophysical and Geoelectrical Methods
ResumoABSTRACT Electrokinetic remediation, effective for low-permeability sediments, can remove both organic and inorganic contaminants simultaneously. This study investigated its application to dredged sediments from Camorim Lagoon (Jacarepaguá lagoon complex, Rio de Janeiro), known to be contaminated with potentially toxic metals (chromium, copper, lead, zinc, and nickel). A buffer solution controlled pH changes, while the complexing agent ethylenediaminetetraacetic acid (EDTA) and humic substances aided metal desorption and removal. Treatments utilizing EDTA (EK2 and EK3) achieved lower final concentrations of zinc and lead. Notably, EK1 (freshwater only) achieved the lowest nickel concentration observed in the anodic section. EK1 also achieved the lowest copper concentration; however, none of the treatments reached regulatory limits for copper. Chromium, which is the least mobile metal, is concentrated in the middle section for all treatments, suggesting the need for further electrolyte optimization to promote efficient chromium transport.
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