2026-05-29T21:00:08Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/185352026-02-03T12:25:40Zcom_10630_2254col_10630_37959

Improving Cr (VI) Extraction through Electrodialysis García-Delgado, Rafael Antonio Nieto-Castilo, A Villén-Guzmán, María Dolores Cerrillo-González, María del Mar Gómez-Lahoz, César Vereda-Alonso, Carlos Paz-García, Juan Manuel Rodríguez-Maroto, José Miguel Electrodiálisis A laboratory study has been carried out to determine the feasibility of in situ remediation of chromium (VI) contaminated soil using electrodialysis. In a classic setup, this technique implies the application of a low intensity direct current to the soil, which is separated from the electrode compartments by ion-exchange membranes. If the pollutants are ionic compounds, they can be forced to migrate to the oppositely charged electrode by electro-migration. Membranes selectively impede the flow of ions in the electrode compartments back to the soil. If a metal species is naturally present as an anion, mobilization from the soil at alkaline pH can be realized and, at the same time, the mobilization of other metal cations that occur at low pH can be minimized. Experiments have been carried out with clayey soils (kaolinite clay and soil clay mixtures) that have been characterized and then contaminated by mixing with a potassium dichromate solution for several days. Initial Cr (VI) content ranges from 500 to 4000 mg/kg. Treatment tests were carried out in an acrylic laboratory cells consisting of a central soil compartment and two electrode compartments located at both ends of the column. Dimensionally stable titanium electrodes coated with mixed metal oxides were placed in the electrode compartments. 0.01M Na2SO4 electrolytes were recirculated through them from two 1-liter deposits using a peristaltic pump. Two commercial ion exchange membranes separated the anolyte and catholyte compartments from the soil in the standard configuration. A programmable DC: power supply was connected to the electrodes and a computer for data acquisition. 2019-10-08T07:53:58Z 2019-10-08T07:53:58Z 2019 2019-10-08 conference output https://hdl.handle.net/10630/18535 eng The 17th International Symposium on Electrokinetic Remediation (EREM 2019) San Miguel de Allende (Guanajuato, México) 22 - 27 septiembre de 2019 open access