Browsing by Author "Bermejo Campos, Daniel Francisco"

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Análisis cienciométrico y sistemático en la investigación de la economía circular enfocado en el tratamiento de aguas residuales desde la perspectiva de la sostenibilidad
(Universidad de Cuenca, 2025-06-05) Bermejo Campos, Daniel Francisco; García Ávila, Fausto Fernando
The increasing scarcity of water and pollution in water bodies, stemming from urbanization and inefficient waste management, highlighted the urgent need for a sustainable approach in wastewater treatment. In this context, the Sustainable Development Goals, provide a global framework to address challenges such as access to clean water and responsible consumption practices. This study conducts a bibliometric and systematic literature analysis to examine the role of circular economy as a strategy to drive sustainability in wastewater treatment plants. A total of 281 scientific publications were analyzed from 2015 to September 2024, using the Scopus database and employing bibliometric tools to identify emerging trends, influential authors, and promising research areas. The results demonstrate an increase in publications since 2015. The implementation of circular economy in wastewater not only enhances water use efficiency but also facilitates resources recovery of and pollution reduction, thereby contributing to compliance with the Sustainable Development Goals. However, there are important gaps, such as the absence of a comprehensive approach that simultaneously considers the economic, social and environmental dimensions. It is recommended that future research address these gaps, extend the analysis to other databases, and delve deeper into the social benefits of circular economy. This study underscores the importance of circular economy as a pathway to improved sustainability in wastewater treatment, although significant barriers to its overall integration remain.
Corncobs as a potentially low-cost biosorbent for sulfamethoxazole removal from aqueous solution
(2020) Peñafiel Tenorio, María Eulalia; Matesanz Martín, José María; Vanegas Peña, María Eulalia; Bermejo Campos, Daniel Francisco; Ormad, María P.
This work examines corncobs adsorption capacity sulfamethoxazole removal from aqueous solutions. Various parameters have been optimized and kinetic, equilibrium and thermodynamic evaluated. The characteristics of corncobs were determined by Brunauer-Emmett-Teller (BET), infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), point of zero charge and chemical analysis. The adsorption kinetic of SMX followed the pseudo-second-order model, reaching the equilibrium at 60 min. In equilibrium, data fitted BET model, the removal efficiency was 48% (pH = 6, SMX concentration 5 mg L−1, 30 g L−1 of adsorbent). The adsorption was sensitive to the pH of solution. The thermodynamic indicates an exothermic process workable under ambient temperatures.
Fixed bed column modeling of lead(II) and cadmium(II) ions biosorption on sugarcane bagasse
(2018) Vera Cabezas, Luisa Mayra; Bermejo Campos, Daniel Francisco; Uguña Rosas, María Fernanda; García Alvear, Nancy Beatriz; Flores Zamora, Marittza Eleanor; González, Enrique
In this paper the results of the biosorption of lead(II) and cadmium(II) with sugarcane bagasse in fixed bed columns are presented. Experimental data were fitted to several models describing the rupture curve for single-component and two-component systems. The percentages of removal of lead and cadmium in single-component systems are 91% and 90%, respectively. In lead-cadmium bicomponent systems the percentage of elimination of lead was 90% and cadmium 92%. In single-component systems, Yoon-Nelson and Thomas models successfully reproduce the rupture curves. In two-component system, the Dose-Response model was the best one reproducing the experimental rupture curves in the entire measured range.
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.
Organic residues as adsorbent for the removal of ciprofloxacin from aqueous solution
(2019) Peñafiel Tenorio, María Eulalia; Vanegas Peña, María Eulalia; Bermejo Campos, Daniel Francisco; Matesanz Martín, José María; Ormad, María P.
Ciprofloxacin was used to study the adsorbent properties of three organic residues: corn cob and rice husk. The study encompassed measuring the effect of the biomass dose, pH, contact time, temperature and initial concentration of the drug. The optimal dose of the adsorbent was established in 2 and 6 g L−1 for the corn cob and rice husk, respectively. The pH strongly affects the adsorption of ciprofloxacin; the optimum pH for the absorption of ciprofloxacin onto the three biomasses is 6. The experiments show a rapid adsorption that hits equilibrium in 60 min for the rice husk and 40 min for corn cob. The temperature has little in fluence with a tendency to a decrease in the percentage of removal when the temperature increases. The removal percentage of ciprofloxacin reaches 56.3% for corn cob and 59.7% for rice husk given an ambient temperature of 20 °C and a ciprofloxacin concentration of 5 mg L−1. The experimental adsorption data can be fitted well by the Freundlich model and the kinetic data by a pseudo second order model. The obtained results suggest that maize and rice husk can be used as low-cost biosorbents for the removal of ciprofloxacin from aqueous solutions.
Remoción de plomo y cadmio presente en aguas residuales mineras mediante biosorción en columnas con bagazo de caña y cáscara de cacao
(2016) Bermejo Campos, Daniel Francisco; Uguña Rosas, María Fernanda
In the province of the Oro sector of Portovelo, are located some artisanal mining companies whose residues, product of the extraction, pollute the waters of the rivers and through analysis it has been encountered that lead and cadmium are outside the norm TULSMA. In this work a study was performed on fixed bed columns using as biosorbents cocoa shell and sugar cane bagasse for which were prepared synthetic solutions with similar characteristics encountered in the wastewater of the mines. To describe the behavior in columns in the process of adsorption of the lead ions and cadmium ions were used different mathematical models as Yoon-Nelson, Thomas and dose-response. Through the modeling of the process was demonstrated that the studied parameters theoretically approach to them experimental. The model of Yoon and Nelson and dose-response reproduced satisfactorily the curve of rupture in function of time, furthermore the model of dose - response is the one that has a best adjustment for the simulation of the curve of rupture in function of the volume of treated effluent.