Pub Date : 2022-07-29DOI: 10.11144/javeriana.iued26.cdss
Juan Daniel Molina-Muñoz, J. A. Christen
Objetivo: Proponer un criterio para determinar el tamaño de muestra en simulaciones estocásticas de MC (Monte Carlo) y MCMC (Markov chain Monte Carlo), garantizando una determinada precisión en la estimación de parámetros. Se busca que la precisión se garantice de forma adimensional. Materiales y métodos: El presente artículo propone un criterio buscando cumplir con el objetivo planteado. Además, de una metodología para la aplicación del mismo. Resultados y discusión: Se presenta la aplicación de la metodología en 3 contextos diferentes: Simulación de MC en que la muestra de interés presenta variabilidad moderada, simulación de MC en que la muestra de interés presenta variabilidad excesiva y simulación de MCMC. En todos los casos se obtienen adecuadas estimaciones del número de corridas MC y MCMC a partir de muestras relativamente pequeñas. Además, la aplicación de la metodología representa únicamente un costo computacional adicional marginal. Conclusiones: El criterio presentado en este artículo permite determinar el tamaño de muestra en simulaciones estocásticas, garantizando precisión adimensional en la estimación de parámetros.
{"title":"Criterio para determinar el tamaño de muestra en procesos de simulación estocástica","authors":"Juan Daniel Molina-Muñoz, J. A. Christen","doi":"10.11144/javeriana.iued26.cdss","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.cdss","url":null,"abstract":"Objetivo: Proponer un criterio para determinar el tamaño de muestra en simulaciones estocásticas de MC (Monte Carlo) y MCMC (Markov chain Monte Carlo), garantizando una determinada precisión en la estimación de parámetros. Se busca que la precisión se garantice de forma adimensional. Materiales y métodos: El presente artículo propone un criterio buscando cumplir con el objetivo planteado. Además, de una metodología para la aplicación del mismo. Resultados y discusión: Se presenta la aplicación de la metodología en 3 contextos diferentes: Simulación de MC en que la muestra de interés presenta variabilidad moderada, simulación de MC en que la muestra de interés presenta variabilidad excesiva y simulación de MCMC. En todos los casos se obtienen adecuadas estimaciones del número de corridas MC y MCMC a partir de muestras relativamente pequeñas. Además, la aplicación de la metodología representa únicamente un costo computacional adicional marginal. Conclusiones: El criterio presentado en este artículo permite determinar el tamaño de muestra en simulaciones estocásticas, garantizando precisión adimensional en la estimación de parámetros.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72528030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-27DOI: 10.11144/javeriana.iued26.pnsb
David Leonardo Blanco-Estupiñan, Angela Bermudez-Castañeda, Sebastián Marquez
Objetivo: evaluar la resistencia a la corrosión de las boquillas de inyección de acero inoxidable bajo ensayo de inmersión en biodiésel, y realizar una caracterización electroquímica bajo soluciones de HNO3. Métodos y materiales: Se realizó la caracterización química del biodiésel para analizar su estabilidad. Se realizaron pruebas de inmersión durante 4 meses, evaluando el acero inoxidable 304 bajo 3 concentraciones diferentes de mezclas de diésel/biocombustible. Además, se realizaron ensayos de polarización con concentraciones de NOx superiores a los niveles medidos en las emisiones de los motores. Resultados y discusión: El uso de biocombustibles en Colombia ha sido impulsado en gran medida por la producción de etanol de origen vegetal. Su uso aporta algunas ventajas relacionadas con la reducción de las emisiones de partículas y gases tóxicos (principalmente, grupos aromáticos, NOx y CO2). Sin embargo, puede producirse una degradación de los materiales cuando están en contacto directo con el biodiésel. Además, se ha informado de solidificación de ceras, que provoca el taponamiento de las boquillas. No obstante, se desconoce si esto influye en la difusión del oxígeno en la solución y, a su vez, afecta a la resistencia a la corrosión del acero inoxidable. Conclusiones: La resistencia a la corrosión del acero inoxidable 304 cambió bajo condiciones de inmersión, aunque su capa protectora no se vio afectada por las concentraciones de NOx registradas en las mezclas de biocombustible.
{"title":"Evaluación del comportamiento de aceros de toberas aceros de toberas en biocombustible","authors":"David Leonardo Blanco-Estupiñan, Angela Bermudez-Castañeda, Sebastián Marquez","doi":"10.11144/javeriana.iued26.pnsb","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.pnsb","url":null,"abstract":"Objetivo: evaluar la resistencia a la corrosión de las boquillas de inyección de acero inoxidable bajo ensayo de inmersión en biodiésel, y realizar una caracterización electroquímica bajo soluciones de HNO3. Métodos y materiales: Se realizó la caracterización química del biodiésel para analizar su estabilidad. Se realizaron pruebas de inmersión durante 4 meses, evaluando el acero inoxidable 304 bajo 3 concentraciones diferentes de mezclas de diésel/biocombustible. Además, se realizaron ensayos de polarización con concentraciones de NOx superiores a los niveles medidos en las emisiones de los motores. Resultados y discusión: El uso de biocombustibles en Colombia ha sido impulsado en gran medida por la producción de etanol de origen vegetal. Su uso aporta algunas ventajas relacionadas con la reducción de las emisiones de partículas y gases tóxicos (principalmente, grupos aromáticos, NOx y CO2). Sin embargo, puede producirse una degradación de los materiales cuando están en contacto directo con el biodiésel. Además, se ha informado de solidificación de ceras, que provoca el taponamiento de las boquillas. No obstante, se desconoce si esto influye en la difusión del oxígeno en la solución y, a su vez, afecta a la resistencia a la corrosión del acero inoxidable. Conclusiones: La resistencia a la corrosión del acero inoxidable 304 cambió bajo condiciones de inmersión, aunque su capa protectora no se vio afectada por las concentraciones de NOx registradas en las mezclas de biocombustible.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85497894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-25DOI: 10.11144/javeriana.iued26.iafd
Laura Andrea Florez-Bedoya, Laura Estefanía Mora-Joaqui, B. Cruz-Muñoz, R. Dorantes-Rodríguez, Sebastián Ospina-Castro, Alexander Ríos-Gaviria
We present the design, construction, and implementation of thin film deposition equipment based on the Sol/Gel dip-coating technique for the fabrication of coatings under controlled deposition conditions and working environment at ambient temperature and pressure. The deposition system includes a 304 stainless steel structure and a moving platform that holds the substrate and is transported along vertical axes at a deposition distance of up to 30 cm in height. The mechanical and electronic design was considered, using computer-aided development and dimensional validation (for the structure and the motion transmission system) and the programming of the system using the Arduino platform. The design focused on the deposition speed control for the functional equipment operations, whose operating principle is based on a PWM scheme, achieving an immersion/extraction speed parameter in ranges between 1.5 cm/s and 3.5 cm/s (with a resolution of ± 0.2 cm/s). The operation of the equipment and the reproducibility of the deposits were tested by studying the optical properties of CuCoMn coatings on glass. A substrate immersion/extraction speed of 1.5 cm/s and precursor agitation time (0.83 h - 0.98 h) were used, obtaining absorbances higher than 90%. In conclusion, the implemented prototype will allow the research group to produce reproducible thin films of better quality than those made manually, which can be produced at a low cost and offer the possibility of sustainable maintenance of the equipment.
我们介绍了基于溶胶/凝胶浸涂技术的薄膜沉积设备的设计、建造和实现，用于在室温和常压下控制沉积条件和工作环境下制备涂层。沉积系统包括一个304不锈钢结构和一个移动平台，该平台可容纳基材，并沿垂直轴以高达30厘米的沉积距离运输。考虑机械和电子设计，采用计算机辅助开发和尺寸验证(针对结构和运动传输系统)，并使用Arduino平台对系统进行编程。设计重点是功能设备操作的沉积速度控制，其工作原理基于PWM方案，实现浸入/提取速度参数在1.5 cm/s到3.5 cm/s之间(分辨率为±0.2 cm/s)。通过研究CuCoMn涂层在玻璃上的光学性能，对设备的操作和镀层的重现性进行了测试。底物浸提速度为1.5 cm/s，前驱体搅拌时间为0.83 h ~ 0.98 h，吸光度高于90%。总之，实现的原型将使研究小组能够生产出比手工制作的质量更好的可复制薄膜，这可以以低成本生产，并提供设备可持续维护的可能性。
{"title":"Implementation of an Automated Film Deposition Equipment under the sol/gel Dip-Coating Technique","authors":"Laura Andrea Florez-Bedoya, Laura Estefanía Mora-Joaqui, B. Cruz-Muñoz, R. Dorantes-Rodríguez, Sebastián Ospina-Castro, Alexander Ríos-Gaviria","doi":"10.11144/javeriana.iued26.iafd","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.iafd","url":null,"abstract":"We present the design, construction, and implementation of thin film deposition equipment based on the Sol/Gel dip-coating technique for the fabrication of coatings under controlled deposition conditions and working environment at ambient temperature and pressure. The deposition system includes a 304 stainless steel structure and a moving platform that holds the substrate and is transported along vertical axes at a deposition distance of up to 30 cm in height. The mechanical and electronic design was considered, using computer-aided development and dimensional validation (for the structure and the motion transmission system) and the programming of the system using the Arduino platform. The design focused on the deposition speed control for the functional equipment operations, whose operating principle is based on a PWM scheme, achieving an immersion/extraction speed parameter in ranges between 1.5 cm/s and 3.5 cm/s (with a resolution of ± 0.2 cm/s). The operation of the equipment and the reproducibility of the deposits were tested by studying the optical properties of CuCoMn coatings on glass. A substrate immersion/extraction speed of 1.5 cm/s and precursor agitation time (0.83 h - 0.98 h) were used, obtaining absorbances higher than 90%. In conclusion, the implemented prototype will allow the research group to produce reproducible thin films of better quality than those made manually, which can be produced at a low cost and offer the possibility of sustainable maintenance of the equipment.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"207 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85503859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-21DOI: 10.11144/javeriana.iued26.aecw
Manuel Ricardo Pérez-Cerquera, Jairo Alberto Hurtado Londoño, Juan Manuel Cruz-Bohorquez
This paper describes and discusses the implementation of a project-based undergraduate course on applied electromagnetics in electronics engineering with a conceiving-designing-implementing-operating (CDIO) approach involving active project-based learning (PBL). The course, which requires a combination of mathematical and physics concepts for its completion, allows students to understand the principles of electromagnetic transmission theory in wireless communication systems. This paper presents the course proposal, its project description, and results hinting at the relationship with the CDIO process. The proposed projects allow students to engage in core concepts such as complex vectors, Maxwell’s equations, boundary conditions, Poynting's theorem, uniform plane waves, reflection and transmission of waves, waveguides, cavity resonators, and computer-assisted design. The proposed methodology results suggest that students lowered their perception of the difficulty of the course, and most students recognized a better learning process of the core concepts for this course. In addition, students’ final course grades showed an average improvement of approximately 6% compared with the final grades of other groups with different methodologies.
{"title":"Applied Electromagnetics Course with a Conceiving-Designing-Implementing-Operating Approach in Engineering Education","authors":"Manuel Ricardo Pérez-Cerquera, Jairo Alberto Hurtado Londoño, Juan Manuel Cruz-Bohorquez","doi":"10.11144/javeriana.iued26.aecw","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.aecw","url":null,"abstract":"This paper describes and discusses the implementation of a project-based undergraduate course on applied electromagnetics in electronics engineering with a conceiving-designing-implementing-operating (CDIO) approach involving active project-based learning (PBL). The course, which requires a combination of mathematical and physics concepts for its completion, allows students to understand the principles of\u0000electromagnetic transmission theory in wireless communication systems. This paper presents the course proposal, its project description, and results hinting at the relationship with the CDIO process. The proposed projects allow students to engage in core concepts such as complex vectors, Maxwell’s equations, boundary conditions, Poynting's theorem, uniform plane waves, reflection and transmission of waves, waveguides, cavity resonators, and computer-assisted design. The proposed methodology results suggest that students lowered their perception of the difficulty of the course, and most students recognized a better learning process of the core concepts for this course. In addition, students’ final course grades showed an average improvement of approximately 6% compared with the final grades of other groups with different methodologies.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77668313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-21DOI: 10.11144/javeriana.iued26.sboa
Juan David Carvajal-Hernandez, Andres Felipe Osorio-Muriel
Objective: Estimate an optimal policy for the blood platelets supply chain distribution problem using a vendor-managed inventory problems approach. Methods and materials: This paper uses an integrated simulation-based optimization model to develop a Vendor-Managed Inventory approach for blood platelets. Simulation is used to estimate the performance of a defined inventory policy. On the other hand, a genetic algorithm finds optimal or near-optimal inventory policies. This approach is evaluated using a case study inspired by a real blood center in Colombia. Results and discussion: Using the proposed approach, key indicators in the blood supply chain such as total cost and outdated units are significantly improved while maintaining the service level. In terms of costs, the VMI model shows a 19.19% advantage over the non-VMI solution. Moreover, the proposed VMI solution can reduce by 42.25% the number of expired platelets. Conclusions: Using a VMI-based distribution system and a simulation-based optimization approach with genetic algorithms offers promising results in the proposed use case. This mixed methodology allows for flexible system configurations without the need for complex changes in the algorithm, and it does so without the need for excessive computational resources.
{"title":"Simulation-Based Optimization Algorithm for the Vendor-Managed Inventory Problem for Blood Platelets","authors":"Juan David Carvajal-Hernandez, Andres Felipe Osorio-Muriel","doi":"10.11144/javeriana.iued26.sboa","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.sboa","url":null,"abstract":"Objective: Estimate an optimal policy for the blood platelets supply chain distribution problem using a vendor-managed inventory problems approach. Methods and materials: This paper uses an integrated simulation-based optimization model to develop a Vendor-Managed Inventory approach for blood platelets. Simulation is used to estimate the performance of a defined inventory policy. On the other hand, a genetic algorithm finds optimal or near-optimal inventory policies. This approach is evaluated using a case study inspired by a real blood center in Colombia. Results and discussion: Using the proposed approach, key indicators in the blood supply chain such as total cost and outdated units are significantly improved while maintaining the service level. In terms of costs, the VMI model shows a 19.19% advantage over the non-VMI solution. Moreover, the proposed VMI solution can reduce by 42.25% the number of expired platelets. Conclusions: Using a VMI-based distribution system and a simulation-based optimization approach with genetic algorithms offers promising results in the proposed use case. This mixed methodology allows for flexible system configurations without the need for complex changes in the algorithm, and it does so without the need for excessive computational resources.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87457149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-14DOI: 10.11144/javeriana.iued26.beui
Juan Daniel Molina-Muñoz, Luis Fernando Giraldo-Jaramillo, Edilson Delgado-Trejos
Objetivo: Proponer un procedimiento metodológico que sirva de guía para aplicar técnicas en la evaluación de la incertidumbre de medida, como son: GUM, MMC y Bayes; además, de desarrollar una aplicación en un caso de estudio no trivial. Materiales y métodos: En el presente artículo, se proponen un conjunto de pasos que permiten validar la evaluación de incertidumbre de medida a partir de técnicas como GUM, MMC y Bayes; estas se aplicaron como estrategia para evaluar la incertidumbre de un proceso de medición indirecta, donde el experimento de pruebas consistió en determinar el nivel de un fluido a través de la medición de presión hidrostática que genera el fluido en estado estacionario sobre la base de un contenedor. Se compararon los resultados obtenidos con cada técnica. Resultados y discusión: se encontró que el uso de la GUM es válido en el fenómeno caso de estudio, sin embargo, los resultados obtenidos aplicando el enfoque Bayesiano y el MMC ofrecieron información complementaria de mucha utilidad, como es la función de densidad de probabilidad (FDP) del mensurando, que permitió una mejor descripción del fenómeno. Asimismo, las FDP a posteriori obtenidas con Bayes permitieron aproximar a valores más cercanos en torno de los verdaderos valores del mensurando, y los intervalos de los posibles valores fueron más amplios que los que ofrecieron el MMC y la GUM. Conclusiones: En el contexto del caso de estudio se tiene que el enfoque bayesiano presenta resultados más realistas que GUM y MMC; además de la ventaja conceptual que presenta Bayes, de la posibilidad de actualizar los resultados de la evaluación de incertidumbre ante la presencia de nueva evidencia.
{"title":"Evaluación bayesiana de la incertidumbre en mediciones indirectas comparada con GUM y Monte Carlo","authors":"Juan Daniel Molina-Muñoz, Luis Fernando Giraldo-Jaramillo, Edilson Delgado-Trejos","doi":"10.11144/javeriana.iued26.beui","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.beui","url":null,"abstract":"Objetivo: Proponer un procedimiento metodológico que sirva de guía para aplicar técnicas en la evaluación de la incertidumbre de medida, como son: GUM, MMC y Bayes; además, de desarrollar una aplicación en un caso de estudio no trivial. Materiales y métodos: En el presente artículo, se proponen un conjunto de pasos que permiten validar la evaluación de incertidumbre de medida a partir de técnicas como GUM, MMC y Bayes; estas se aplicaron como estrategia para evaluar la incertidumbre de un proceso de medición indirecta, donde el experimento de pruebas consistió en determinar el nivel de un fluido a través de la medición de presión hidrostática que genera el fluido en estado estacionario sobre la base de un contenedor. Se compararon los resultados obtenidos con cada técnica. Resultados y discusión: se encontró que el uso de la GUM es válido en el fenómeno caso de estudio, sin embargo, los resultados obtenidos aplicando el enfoque Bayesiano y el MMC ofrecieron información complementaria de mucha utilidad, como es la función de densidad de probabilidad (FDP) del mensurando, que permitió una mejor descripción del fenómeno. Asimismo, las FDP a posteriori obtenidas con Bayes permitieron aproximar a valores más cercanos en torno de los verdaderos valores del mensurando, y los intervalos de los posibles valores fueron más amplios que los que ofrecieron el MMC y la GUM. Conclusiones: En el contexto del caso de estudio se tiene que el enfoque bayesiano presenta resultados más realistas que GUM y MMC; además de la ventaja conceptual que presenta Bayes, de la posibilidad de actualizar los resultados de la evaluación de incertidumbre ante la presencia de nueva evidencia.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87016111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-12DOI: 10.11144/javeriana.iued26.brhp
J. Castillo, Paula Andrea Guarin-Guio, Ludy Ortiz
Objective: In this article a comparison was made between graphene (SPGE) and graphene oxide screen-printed electrodes (SPGOE) to study the bio-electrocatalytic reduction of hydrogen peroxide (H2O2) by guinea grass peroxidase (GGP). Methods and materials: GGP was immobilized onto SPGE and SPGOE by a drop-casting procedure. Electrochemical techniques were carried out to monitor the electrochemical behavior of GGP and the efficiency of electrocatalytic reduction of H2O2. Results and discussion: GGP adsorbed on both electrodes exhibited a couple of well-defined redox peaks at 120 mV/10.5 mV and 184 mV/59 mV for anodic and cathodic peaks, respectively. Linearity between scan rates root and oxidation and reduction peak currents for both electrodes suggest a surface-controlled process. The GGP-modified electrodes exhibited a good electrocatalytic activity to H2O2 reduction at a redox potential of -0.6 V and -0.5 V for SPEG and SPEGO, respectively. Conclusions: SPGE and SPGOE electrodes modified with GGP showed excellent analytical performance towards different concentrations of hydrogen peroxide. This is a preliminary step to developing a bio-analytical portable system based on GGP for the detection of H2O2 in real environmental samples.
{"title":"Bio-Electrocatalytic Reduction of Hydrogen Peroxide by Peroxidase from Guinea Grass (Panicum Maximum) Immobilized on Graphene and Graphene Oxide Screen-Printed Electrodes","authors":"J. Castillo, Paula Andrea Guarin-Guio, Ludy Ortiz","doi":"10.11144/javeriana.iued26.brhp","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.brhp","url":null,"abstract":"Objective: In this article a comparison was made between graphene (SPGE) and graphene oxide screen-printed electrodes (SPGOE) to study the bio-electrocatalytic reduction of hydrogen peroxide (H2O2) by guinea grass peroxidase (GGP). Methods and materials: GGP was immobilized onto SPGE and SPGOE by a drop-casting procedure. Electrochemical techniques were carried out to monitor the electrochemical behavior of GGP and the efficiency of electrocatalytic reduction of H2O2. Results and discussion: GGP adsorbed on both electrodes exhibited a couple of well-defined redox peaks at 120 mV/10.5 mV and 184 mV/59 mV for anodic and cathodic peaks, respectively. Linearity between scan rates root and oxidation and reduction peak currents for both electrodes suggest a surface-controlled process. The GGP-modified electrodes exhibited a good electrocatalytic activity to H2O2 reduction at a redox potential of -0.6 V and -0.5 V for SPEG and SPEGO, respectively. Conclusions: SPGE and SPGOE electrodes modified with GGP showed excellent analytical performance towards different concentrations of hydrogen peroxide. This is a preliminary step to developing a bio-analytical portable system based on GGP for the detection of H2O2 in real environmental samples.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87767932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-12DOI: 10.11144/javeriana.iued26.tadc
Cesar René Blanco-Zuñiga, Zully Ximena Chacón-Rojas, Juan Sebastian Villarraga-Castillo, Heidy Elizabeth Guevara-Suarez, Yesica Nataly Casteblanco-Castro, N. Rojas-Arias
Coal mining represents one of the primary economic incomes in the department of Boyacá, Colombia. However, the acid mine drainage (AMD) generated has a tremendous environmental impact in the area due to the presence of sulfate ions (SO4-2), heavy metals, and low pH This article studies the behavior in the content of Fe and sulfates in AMD samples when treated within an artificial anaerobic vertical flow wetland, analyzing the concentration of these elementsand the content of dissolved oxygen (DO) and pH at different time intervals. The treatment of a MAD from the department of Boyacá was carried out using a bioreactor prototype with an organic substrate to provide the necessary conditions for the development of sulfate-reducing bacteria. Measurements were made with hydraulic retention times between 24 to 120 hours, monitoring the changes in the content of total Fe, SO4-2, pH, and DO. The data obtained show a reduction for total Fe of 88.3%, established at 5.61g∙m-2∙day-1, and for SO4-2 of 34.3% with 9.35g∙m-2∙day-1; reaching a maximum removal degree of 52.32% at 120h for sulfates and 92% for Fe, where the maximum removal peak is achieved, reducing the Fe removal rate for longer times. The reduction in the concentration of Fe is related to the reduction of DO and regulation of the pH, in addition to favoring the reduction of sulfate ions through the formation of the mineralogical phases pyrite and siderite. These data show that the anoxic conditions of the organic environment are maintained, for which a subsequent aeration stage is suggested.
{"title":"Treatment of Acid Drainage from Coal Mines Produced in the Boyacá Region, Colombia, using an Anaerobic Wetland with an Upward Flow","authors":"Cesar René Blanco-Zuñiga, Zully Ximena Chacón-Rojas, Juan Sebastian Villarraga-Castillo, Heidy Elizabeth Guevara-Suarez, Yesica Nataly Casteblanco-Castro, N. Rojas-Arias","doi":"10.11144/javeriana.iued26.tadc","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.tadc","url":null,"abstract":"Coal mining represents one of the primary economic incomes in the department of Boyacá, Colombia. However, the acid mine drainage (AMD) generated has a tremendous environmental impact in the area due to the presence of sulfate ions (SO4-2), heavy metals, and low pH This article studies the behavior in the content of Fe and sulfates in AMD samples when treated within an artificial anaerobic vertical flow wetland, analyzing the concentration of these elementsand the content of dissolved oxygen (DO) and pH at different time intervals. The treatment of a MAD from the department of Boyacá was carried out using a bioreactor prototype with an organic substrate to provide the necessary conditions for the development of sulfate-reducing bacteria. Measurements were made with hydraulic retention times between 24 to 120 hours, monitoring the changes in the content of total Fe, SO4-2, pH, and DO. The data obtained show a reduction for total Fe of 88.3%, established at 5.61g∙m-2∙day-1, and for SO4-2 of 34.3% with 9.35g∙m-2∙day-1; reaching a maximum removal degree of 52.32% at 120h for sulfates and 92% for Fe, where the maximum removal peak is achieved, reducing the Fe removal rate for longer times. The reduction in the concentration of Fe is related to the reduction of DO and regulation of the pH, in addition to favoring the reduction of sulfate ions through the formation of the mineralogical phases pyrite and siderite. These data show that the anoxic conditions of the organic environment are maintained, for which a subsequent aeration stage is suggested.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84787736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-02DOI: 10.11144/javeriana.iyu26.twtp
Maria Camila Zapata Zúñiga, Miguel Angel Parra-Pérez, Johan Alexander Álvarez-Berrio, N. I. Molina-Gómez
This study aimed to evaluate the efficiency of technologies for removing antibiotics, antibiotic-resistant bacteria and their antibiotic resistance genes, and the countries where they have been developed. For this purpose, was conducted a systematic review to identify the tertiary treatments to remove the above-mentioned pollutants. The ScienceDirect and Scopus databases were used as sources of information, taking into account only experimental research from 2006 to 2019 and technologies with removal rates higher than 70% to the information analyses. From the analysis of 9 technologies evaluated, in a set of 47 investigations, photo-Fenton, and electrochemical treatments were found to be the most efficient in the removal of antibiotics; gamma radiation and photocatalysis with TiO2 and UV revealed better results in the removal of resistant microbial agents and their resistance genes, with efficiencies of 99.9%. As one of the largest producers and consumers of antibiotics, China appears to be the country with the most scientific research on the area. The importance of innovation in wastewater treatment processes to achieve better results in the remotion of antibiotics, antibiotic-resistant bacteria, and their resistance genes is highlighted, given the effects on the aquatic ecosystems and public health.
{"title":"Technologies in Wastewater Treatment Plants for the Removal of Antibiotics, Resistant Bacteria and Antibiotic Resistance Genes: a Review of the Current Literature","authors":"Maria Camila Zapata Zúñiga, Miguel Angel Parra-Pérez, Johan Alexander Álvarez-Berrio, N. I. Molina-Gómez","doi":"10.11144/javeriana.iyu26.twtp","DOIUrl":"https://doi.org/10.11144/javeriana.iyu26.twtp","url":null,"abstract":"This study aimed to evaluate the efficiency of technologies for removing antibiotics, antibiotic-resistant bacteria and their antibiotic resistance genes, and the countries where they have been developed. For this purpose, was conducted a systematic review to identify the tertiary treatments to remove the above-mentioned pollutants. The ScienceDirect and Scopus databases were used as sources of information, taking into account only experimental research from 2006 to 2019 and technologies with removal rates higher than 70% to the information analyses. From the analysis of 9 technologies evaluated, in a set of 47 investigations, photo-Fenton, and electrochemical treatments were found to be the most efficient in the removal of antibiotics; gamma radiation and photocatalysis with TiO2 and UV revealed better results in the removal of resistant microbial agents and their resistance genes, with efficiencies of 99.9%. As one of the largest producers and consumers of antibiotics, China appears to be the country with the most scientific research on the area. The importance of innovation in wastewater treatment processes to achieve better results in the remotion of antibiotics, antibiotic-resistant bacteria, and their resistance genes is highlighted, given the effects on the aquatic ecosystems and public health.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79427128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-11-02DOI: 10.11144/javeriana.iued26.ibca
Laura Moreno-Escandón, Daniela Perea-Soto, Jonathan Soto-Paz, P. Torres-Lozada, Luis Fernando Marmolejo-Rebellón
Objetivo: Evaluar cómo la modificación de cachaza (CA) como material de enmienda, afectación de la eficiencia del proceso y la calidad del producto final del compostaje de biorresiduos de origen municipal (BOM). Materiales y métodos: En este estudio se evaluó una escala piloto y en términos de estabilidad, madurez y valor agrícola, el efecto de la modificación de CA sobre el compuesto de BOM en cuatro proporciones de mezcla BOM: CA (100: 00 - control; 90:10; 80:20 y 70:30). Resultados: Los resultados que afectan en general, la modificación de CA alcanzan temperaturas termofílicas en menor tiempo que el tratamiento control y alcanzan mejores condiciones de estabilidad (consumo de oxígeno <1,0 mgO 2/ gSVh), Índice de Germinación (IG> 80%: indicador de un producto maduro) e Índice de calidad de compost (IF> 3,5: indicador de alto potencial de fertilización de suelos), siendo la proporción 80:20 la mejor calidad del producto (mayor contenido de N total: 2,32%, PT: 1,42%, CIC: 65,5 meq / 100g), menor valor de CE (0,38 dS / m) y de coliformes totales y fecales (15,3 y 4,0 NMP / g respectivamente), cumpliendo con normas técnicas como la colombiana y la chilena para productos orgánicos utilizados como fertilizantes y acondicionadores del suelo, además de los mejores resultados de IG e IF (123,40% y 4,67 respectivamente).
{"title":"Mejora del compostaje de biorresiduos mediante la incorporación de cachaza como material de enmienda","authors":"Laura Moreno-Escandón, Daniela Perea-Soto, Jonathan Soto-Paz, P. Torres-Lozada, Luis Fernando Marmolejo-Rebellón","doi":"10.11144/javeriana.iued26.ibca","DOIUrl":"https://doi.org/10.11144/javeriana.iued26.ibca","url":null,"abstract":"Objetivo: Evaluar cómo la modificación de cachaza (CA) como material de enmienda, afectación de la eficiencia del proceso y la calidad del producto final del compostaje de biorresiduos de origen municipal (BOM). Materiales y métodos: En este estudio se evaluó una escala piloto y en términos de estabilidad, madurez y valor agrícola, el efecto de la modificación de CA sobre el compuesto de BOM en cuatro proporciones de mezcla BOM: CA (100: 00 - control; 90:10; 80:20 y 70:30). Resultados: Los resultados que afectan en general, la modificación de CA alcanzan temperaturas termofílicas en menor tiempo que el tratamiento control y alcanzan mejores condiciones de estabilidad (consumo de oxígeno <1,0 mgO 2/ gSVh), Índice de Germinación (IG> 80%: indicador de un producto maduro) e Índice de calidad de compost (IF> 3,5: indicador de alto potencial de fertilización de suelos), siendo la proporción 80:20 la mejor calidad del producto (mayor contenido de N total: 2,32%, PT: 1,42%, CIC: 65,5 meq / 100g), menor valor de CE (0,38 dS / m) y de coliformes totales y fecales (15,3 y 4,0 NMP / g respectivamente), cumpliendo con normas técnicas como la colombiana y la chilena para productos orgánicos utilizados como fertilizantes y acondicionadores del suelo, además de los mejores resultados de IG e IF (123,40% y 4,67 respectivamente).\u0000 ","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75067251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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