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In Chile, 85% of tailings impoundments are inactive or abandoned and many of them do not have a program of treatment or afforestation. The phytoremediation of tailings with Oxalis gigantea, Cistanthe grandiflora, Puya berteroniana and Solidago chilensis have been tested in order to find plants with ornamental value and low water requirements, which enable reductions in molybdenum (Mo), copper (Cu) or lead (Pb) concentrations creating an environmentally friendly surrounding. Ex-situ phytoremediation experiments were carried out for seven months and Mo, Cu and Pb were measured at the beginning and at the end of the growth period. The capacity of these species to phyto-remedy was evaluated using the bioconcentration and translocation factors, along with assessing removal efficiency. Solidago chilensis showed the ability to phytoextract Mo while Puya berteroniana showed potential for Cu and Mo stabilization. The highest removal efficiencies were obtained for Mo, followed by Cu and Pb. The maximum values of removal efficiency for Mo, Cu and Pb were 28.7% with Solidago chilensis, 15.6% with Puya berteroniana and 8.8% with Cistanthe grandiflora, respectively. Therefore, the most noticeable results were obtained with Solidago chilensis for phytoextraction of Mo.
Pamela Lazo; Andrea Lazo. Assessment of Native and Endemic Chilean Plants for Removal of Cu, Mo and Pb from Mine Tailings. Minerals 2020, 10, 1020 .
AMA StylePamela Lazo, Andrea Lazo. Assessment of Native and Endemic Chilean Plants for Removal of Cu, Mo and Pb from Mine Tailings. Minerals. 2020; 10 (11):1020.
Chicago/Turabian StylePamela Lazo; Andrea Lazo. 2020. "Assessment of Native and Endemic Chilean Plants for Removal of Cu, Mo and Pb from Mine Tailings." Minerals 10, no. 11: 1020.
The analysis of Cu distribution in pre-treated mine tailings after electrodialytic remediation was carried out by using two methods of sequential extraction. The initial content of copper in the tailings was 1109 mg Cu/kg of dry tailing, where close to 40% of the sample in weight corresponded to a soluble fraction. The tailing was treated with a leaching solution for 24 h. Three different solutions were tested: H2SO4 + HNO3 with pH = 1.9; H2SO4 + HNO3 with pH = 4.2; and NH4Cl 0.8 mol/L with pH = 5.5. After that, electrodialytic remediation experiments were carried out using an electric field of 2.7 V/cm for 15 days. The best performance for the complete cell was obtained with H2SO4 + HNO3 solutions, with a copper removal efficiency in the range of 62% to 67% and a current efficiency between 6% and 9%. The results of the remaining copper concentration between anode and cathode, from both procedures of sequential extraction, showed similar trends. The differences were mainly attributed to the use of different extractant solutions and extraction times. Soluble and exchangeable fractions were easily removed, with efficiencies higher than 80%. The lowest copper removal efficiency was obtained with NH4Cl 0.8 mol/L.
Andrea Lazo; Pamela Lazo; Alejandra Urtubia; María Gabriela Lobos; Claudia Gutiérrez; Henrik K. Hansen. Copper Analysis by Two Different Procedures of Sequential Extraction after Electrodialytic Remediation of Mine Tailings. International Journal of Environmental Research and Public Health 2019, 16, 3957 .
AMA StyleAndrea Lazo, Pamela Lazo, Alejandra Urtubia, María Gabriela Lobos, Claudia Gutiérrez, Henrik K. Hansen. Copper Analysis by Two Different Procedures of Sequential Extraction after Electrodialytic Remediation of Mine Tailings. International Journal of Environmental Research and Public Health. 2019; 16 (20):3957.
Chicago/Turabian StyleAndrea Lazo; Pamela Lazo; Alejandra Urtubia; María Gabriela Lobos; Claudia Gutiérrez; Henrik K. Hansen. 2019. "Copper Analysis by Two Different Procedures of Sequential Extraction after Electrodialytic Remediation of Mine Tailings." International Journal of Environmental Research and Public Health 16, no. 20: 3957.
Mine tailings have been analyzed by a sequential extraction procedure after their pre-treatment with a leaching solution for 24 h and electrodialytic remediation during 15 days with a constant electric field of 2.7 V cm−1. Four leaching solutions were tested: H2SO4 + HNO3 (2:1 vol.) pH = 1.9; H2SO4 + HNO3 (2:1 vol) pH = 4.2; NH4Cl 0.8M, pH = 5.5 and 30% H2O2 adjusted to pH 2 with HNO3 1M + HCl 1M. After the treatment, the tailings were divided in six slices from anode to cathode. The highest removal efficiency of copper was obtained with H2SO4 + HNO3 pH = 1.9, which allows one to remove 67% of the copper in the total cell and 85% of the copper in the slice closest to anode. The same solution with pH = 4.2 allows one to remove 62% of the total copper. The analysis realized by the sequential extraction method indicates the easy removal of water-soluble and exchangeable fractions in all experiments, moreover, residual and sulfide are the less mobile fractions. The general trend was the movement of copper associated to different fractions from anode to cathode and its accumulation closest to the cathode in the case of exchangeable, Fe-Mn oxides and acid soluble fractions, possibly due to some precipitation of copper compounds associated with less acidic conditions.
Andrea Lazo; Henrik K. Hansen; Pamela Lazo; Claudia Gutiérrez. Application of a Sequential Extraction Method for Analyzing Cu Distribution in Pre-Treated Mine Tailings after Electrodialytic Remediation. International Journal of Environmental Research and Public Health 2019, 16, 584 .
AMA StyleAndrea Lazo, Henrik K. Hansen, Pamela Lazo, Claudia Gutiérrez. Application of a Sequential Extraction Method for Analyzing Cu Distribution in Pre-Treated Mine Tailings after Electrodialytic Remediation. International Journal of Environmental Research and Public Health. 2019; 16 (4):584.
Chicago/Turabian StyleAndrea Lazo; Henrik K. Hansen; Pamela Lazo; Claudia Gutiérrez. 2019. "Application of a Sequential Extraction Method for Analyzing Cu Distribution in Pre-Treated Mine Tailings after Electrodialytic Remediation." International Journal of Environmental Research and Public Health 16, no. 4: 584.
In the present work, an electrocoagulation technique was tested as a possible technological alternative for the treatment of selenium in wastewater from a petroleum refinery. For this purpose, a batch airlift reactor with air stirring was used. The sacrificial electrodes were made of iron to generate the necessary ferrous ions for the process. The results indicated a selenium removal of 90% from the wastewater after 6 hour of treatment, achieving a decrease in concentration from 0.30 mg L-1 to 0.03 mg L-1. The current density was found to be an important variable for the process. In conclusion, the electrocoagulation process seems to be a feasible selenium removal technique applied to petroleum refinery wastewater.
Henrik K. Hansen; Sebastián Franco Peña; Claudia Gutiérrez; Andrea Lazo; Pamela Lazo; Lisbeth M. Ottosen. Selenium removal from petroleum refinery wastewater using an electrocoagulation technique. Journal of Hazardous Materials 2018, 364, 78 -81.
AMA StyleHenrik K. Hansen, Sebastián Franco Peña, Claudia Gutiérrez, Andrea Lazo, Pamela Lazo, Lisbeth M. Ottosen. Selenium removal from petroleum refinery wastewater using an electrocoagulation technique. Journal of Hazardous Materials. 2018; 364 ():78-81.
Chicago/Turabian StyleHenrik K. Hansen; Sebastián Franco Peña; Claudia Gutiérrez; Andrea Lazo; Pamela Lazo; Lisbeth M. Ottosen. 2018. "Selenium removal from petroleum refinery wastewater using an electrocoagulation technique." Journal of Hazardous Materials 364, no. : 78-81.
Luis Vinnett; F. Contreras; Andrea Lazo; M. Morales; F. Díaz; K.E. Waters. The use of radioactive tracers to measure mixing regime in semi-autogenous grinding mills. Minerals Engineering 2018, 115, 41 -43.
AMA StyleLuis Vinnett, F. Contreras, Andrea Lazo, M. Morales, F. Díaz, K.E. Waters. The use of radioactive tracers to measure mixing regime in semi-autogenous grinding mills. Minerals Engineering. 2018; 115 ():41-43.
Chicago/Turabian StyleLuis Vinnett; F. Contreras; Andrea Lazo; M. Morales; F. Díaz; K.E. Waters. 2018. "The use of radioactive tracers to measure mixing regime in semi-autogenous grinding mills." Minerals Engineering 115, no. : 41-43.
Henrik Hansen; Andrea Lazo; Claudia Gutierrez; Manuel Durán; Pamela Lazo; Adrián Rojo. Continuous multistage electrodialytic treatment of copper smelter wastewater. Minerals Engineering 2017, 100, 187 -190.
AMA StyleHenrik Hansen, Andrea Lazo, Claudia Gutierrez, Manuel Durán, Pamela Lazo, Adrián Rojo. Continuous multistage electrodialytic treatment of copper smelter wastewater. Minerals Engineering. 2017; 100 ():187-190.
Chicago/Turabian StyleHenrik Hansen; Andrea Lazo; Claudia Gutierrez; Manuel Durán; Pamela Lazo; Adrián Rojo. 2017. "Continuous multistage electrodialytic treatment of copper smelter wastewater." Minerals Engineering 100, no. : 187-190.