Browsing by Author "Brazales Quizhpe, Diana Esperanza"

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Biosorción de Cd (II) y Pb (II) en columna de lecho fijo con cáscara de cacao
(2018) Vera Cabezas, Luisa Mayra; Bermejo Zari, Daniel Leonardo; Uguña Rosas, María Fernanda; García Alvear, Nancy Beatriz; Flores Zamora, Marittza Eleanor; Brazales Quizhpe, Diana Esperanza
In this work the results of the biosorption of Pb(II) and Cd (II) of synthetic waters with cocoa shell in fixed bed columns are presented. The experimental data were fitted to several models describing the breakdown curve for single component and two component systems. The removal percentages of lead and cadmium in single-component systems are 91% and 90%, respectively. In bicomponent systems Pb-Cd the percentage of lead removal 88% and cadmium 90%. The Dose-Response model in two-component and single-component systems was the one that best reproduced the experimental rupture curves throughout the measured range.
Desarrollo de un plan de seguridad industrial para la empresa INDALUM S.A.
(2010) Brazales Quizhpe, Diana Esperanza; Guzmán P., Diego Amauri; Álvarez Palomeque, Lourdes Ximena
Evaluación toxicológica de soluciones acuosas de ibuprofeno mediante bioensayos con Artemia salina, Allium schoenoprasum L y Lactuca sativa
(2018) Saetama Guallpa, Maria Veronica; Vera Cabezas, Luisa Mayra; Vanegas Peña, María Eulalia; Cruzat Contreras, Christian Américo; Brazales Quizhpe, Diana Esperanza
Drugs are considered within the so-called emerging pollutants, so it is important to investigate the toxic effects they can produce in the environment. The aim of this study was to determine the toxic effect of aqueous solutions of ibuprofen on an aquatic organism Artemia salina and the seeds of Allium schoenoprasum L and Lactuca sativa. The toxicity tests were carried out by exposing the test organisms to concentrations of aqueous ibuprofen solutions of 20, 10, 5, 2, 1 and 0.5 mgL-1. The percentage of mortality for Artemia salina and the elongation of the radicle and hypocotyl for the seeds were determined. The highest mortality percentage occurred at the concentration of 20 mgL-1, the calculated LC50 was 17.386 mgL-1. A low toxic effect was present in the germination of the seeds of Allium schoenoprasum L. There was inhibition in the elongation of the radicle and hypocotyl in seeds of Allium schoenoprasum L and a stimulation effect in the elongation of the radicle and hypocotyl of the seeds of Lactuca sativa. The highest inhibition effect was presented at 1 and 20mgL-1 and the highest stimulation at 20 mgL-1.
Modelado en columna de lecho fijo para la bioadsorción de Cd2+ y Pb2+ con cáscara de cacao
(2018) Vera Cabezas, Luisa Mayra; Bermejo Campos, Daniel Francisco; Uguña Rosas, María Fernanda; García Alvear, Nancy Beatriz; Flores Zamora, Marittza Eleanor; Brazales Quizhpe, Diana Esperanza
In this work the results of the biosorption of Pb+2 and Cd+2 with cocoa shell in fixed bed columns are presented. A hydrodynamic study was performed varying diameter and height of the column, as well as diameter and mass of biosorbent, to determine the best hydrodynamic conditions, which resulted in a flow through the column of 2.12 mL/min. Experimental data were adjusted to several models depending on the effluent volume, which describe the rupture curve for single component and two component systems. The removal percentages of Pb+2 and Cd+2 in single component systems are 91 and 90 %, respctively. In bicomponent systems (Pb+2-Cd+2) the removal percentages of lead and cadmium were 88 and 90 %, respectively. The dose-response model in bi and mono-component systems best reproduced the experimental rupture curves throughout the measured range.
Tecnologías de biosorción y membranas en la eliminación de metales pesados
(2018) Vera Cabezas, Luisa Mayra; García Alvear, Nancy Beatriz; Flores Zamora, Marittza Eleanor; Uguña Rosas, María Fernanda; González, Enrique; Brazales Quizhpe, Diana Esperanza
In this paper a comparison between biosorption membrane technology and the elimination of Pb +2 and Cd +2 wastewater from the mining industry is performed. SEPA cell membranes CF II laboratory scale operations that allows cross-flow filtration with reverse ósmosis membranes (SE, GE Osmonics) and nanofiltration (DK, GE Osmonics), yielding a ratio of ósmosis rejection of 98,77 for Pb +2 is used and 98.30 for Cd + 2 and nanofiltration 98,67 for Pb + 2 and 98.05 for Cd +2 . Powered by biosorption using sugar cane bagasse removal percentages for 97.76 and 81.35 Pb +2 for Cd +2 are obtained. From the environmental point of view the two technologies are compatible with the environment and from the economic point of view, the membranes have a higher initial cost than biosorption process but life is about 10 years, Biosorption you can take advantage of agricultural waste with low acquisition cost. © 2018 Instituto Mexicano de Tecnologia del Agua. All rights reserved.