Browsing by Author "Silva Leal, Jorge Antonio"
Now showing 1 - 20 of 20
Results Per Page
Sort Options
Item Aplicación del internet de las cosas (IoT) en la gestión de almacenes - una revisión de nuevas propuestas(Universidad Santiago de Cali, 2019) Morales Sarria, David Felipe; Silva Leal, Jorge AntonioThe Internet of Things (IoT) is a key concept of the fourth industrial revolution and is considered one of the most promising areas for controlling and improving supply chain performance. This manuscript is an exploration of new proposals for Internet of Things applications in warehouse management over the past five years. A review of the academic literature published between 2015 and 2019 was conducted, with the goal of providing a full description of the cumulative state of research on this topic. Warehousing operations were investigated in the context of five main functions: reception, storage, picking, packing, and shipping. Contributions associated with the use of radio frequency identification (RFID) in reception operations and the use and integration of the Warehouse Management System (WMS) for the support of storage activities and optimization of safety conditions and product profiling are noteworthy. Also, proposals related to Automated Guided Vehicle (AVG) and database management systems to minimize search, travel time, and to avoid picking errors, design of automated packaging systems for packing operations, and a tracking system for the delivery of goods in shipping operations, are highlighted as well. Finally, this synthesis reveals that these types of proposals continue to be a topic of interest in research concerning supply chain management, offering reliable bibliographic support that can be used as a starting point in the consultation and formulation of new initiatives for future researchers or professionals in this field.Item Biological stability and phytotoxicity of sludge generated from extended aeration activated sludge systems(Elsevier B.V., 2025-02) Cárdenas Talero, José Luis; Millán Castro, María del Mar; Silva Leal, Jorge Antonio; Pérez Vidal, Andrea; Torres Lozada, PatriciaActivated sludge technology is widely used for treating municipal wastewater. In particular, the extended aeration activated sludge (EAAS) method shows longer sludge retention time (SRT), which may enhance the biological stability of the resulting sludge. In this study, the biological stability of secondary sludge without dewatering (SS) and dewatered secondary sludge (DSS), dried in a conventional drying bed for 25 days, were examined using two full-scale EAAS systems operating under varying environmental and operational conditions (EAAS1: 24 °C; 926 masl; SRT 16.8 days and EAAS2: 16 °C; 2513 masl; SRT 23.6 days). The volatile solids to total solids ratio (VS/TS), volatile solids reduction (VSR), and specific oxygen uptake rate (SOUR-20) were assessed as indicators of biological stability. Germination tests (phytotoxicity) using radish seeds were conducted with soil-to-sludge mixtures (0:100, 25:75, 50:50, 75:25) and controls of soil only and distilled water. SRT showed a strong correlation with the biological stability of sludge. The EAAS systems did not ensure biological stability for SS, DSS did achieve biological stability, indicating that the dewatering stage, in addition to reducing moisture, contributes to the biological stabilization of the sludge. Heavy metal concentrations in SS and DSS were within regulatory limits, but pathogen levels exceeded them. Phytotoxicity in the SS and DSS was observed at higher sludge concentrations (0:100, 25:75), but the 50:50 mixture showed no toxicity, and the 75:25 mixture even enhanced germination. The results showed that DSS from EAAS systems have agricultural potential; however, their use is contingent upon additional treatments to eliminate pathogens.Item Conformación del sistema de gestión ambiental para la empresa DEMI S.A.S.(2017) Gutierrez Cardenas, Nini Johana; Silva Leal, Jorge AntonioItem Contaminación de aguas subterráneas por arsénico y su grado de afectación sobre la población en América Latina y el Caribe, Una revisión(Universidad Santiago de Cali, 2019) Guerrero Zambrano, Juan Pablo; Silva Leal, Jorge AntonioArsenic (As) is a metalloid that is widely distributed over the earth's surface, there are reports in countries such as China, India, Bangladesh, Vietnam, Chile, Argentina, the United States and Mexico. Its presence is associated with anthropic intervention processes such as mining and pesticide irrigation, as well as natural processes such as bioaccumulation, volcanic and geological activity. In groundwater, it is found as arsenate (As-V) and arsenite (As-III). It is estimated that about 140 million people have been affected by the prolonged exposure of this contaminant, suffering from diseases such as arsenicosis, arseniasis and various types of cancer, which has become a public health issue worldwide. The limits recommended by the WHO should not exceed 10 µg/l of arsenic in the water for human consumption, which is why various treatment technologies have been developed for their removal. Among the conventional ones, there is coagulation, adsorption, precipitation and ion exchange; but in addition, emerging treatment methods are being developed through biological organisms in order to reduce costs and facilitate their application especially in rural areas where access to economic and material resources is limited.Item Efectos ambientales de los hidrocarburos. Una revision(Universidad Santiago de Cali, 2019) Ortíz Díaz, Daniela; Silva Leal, Jorge AntonioThe exploration and exploitation of hydrocarbons and their derivatives constitutes today one of the main industrial activities worldwide, in large part to the different properties and importance of hydrocarbons, not only in the global economy, but also in the activities of the daily living of human beings, for being a fundamental element for the development of almost all activities. However, the different techniques of both exploration, exploitation and production of these chemical compounds have very high levels and probabilities of environmental pollution, mainly because the composition of hydrocarbons generates significant effects on all ecosystems. Faced with this problem, the different scientific advances have begun to use bioremediation techniques with the aim of reducing environmental impacts to influence the recovery of affected ecosystems. This bibliographic review article presents a series of theoretical and conceptual considerations about the effects of the exploration and exploitation of oil and its derivatives, focusing on the environmental effects that these activities bring, as well as the existing regulatory framework in Colombia that regulates all the areas related to the extraction of hydrocarbons.Item Efectos ambientales de los hidrocarburos. Una revisión(Universidad Santiago de Cali, 2019) Ortiz Díaz, Daniela; Silva Leal, Jorge AntonioThe exploration and exploitation of hydrocarbons and their derivatives constitutes today one of the main industrial activities worldwide, in large part to the different properties and importance of hydrocarbons, not only in the global economy, but also in the activities of the daily living of human beings, for being a fundamental element for the development of almost all activities. However, the different techniques of both exploration, exploitation and production of these chemical compounds have very high levels and probabilities of environmental pollution, mainly because the composition of hydrocarbons generates significant effects on all ecosystems. Faced with this problem, the different scientific advances have begun to use bioremediation techniques with the aim of reducing environmental impacts to influence the recovery of affected ecosystems. This bibliographic review article presents a series of theoretical and conceptual considerations about the effects of the exploration and exploitation of oil and its derivatives, focusing on the environmental effects that these activities bring, as well as the existing regulatory framework in Colombia that regulates all the areas related to the extraction of hydrocarbons.Item Effect of biosolids on the nitrogen and phosphorus contents of soil used for sugarcane cultivation(2021) Silva Leal, Jorge Antonio; Pérez Vidal, Andrea; Torres Lozada, PatriciaThe application of biosolids improves soil nutrient availability and crop productivity; however, their application needs to be carefully evaluated so as to avoid the risk of contamination. In this study, a 12-month field experiment using a randomized block design with factorial arrangement was conducted to evaluate the effects of biosolids on the nitrogen and phosphorus contents of a sugarcane-cultivated inceptisol. Three types of dewatered biosolids were used: anaerobically digested (B), anaerobically digested and thermally dried (BST), and anaerobically digested and lime-stabilized (BA) biosolids. The results showed that biosolid use increases soil nitrogen content by up to 37% of the total Kjeldahl nitrogen, 42% of NO3−, 13% of NO2−, and 32% of NH4+. Biosolid treatments exceeded the phosphorus requirement for sugarcane cultivation by up to 277% for B, 170% for BST, and 368% for BA. The application of biosolids sufficient to meet crop nitrogen requirements significantly increased soil phosphorus content, suggesting an overdose and low crop response to the available phosphorus. The application of biosolids yielded results similar to those of mineral fertilizers, suggesting their potential use in agriculture.Item Evaluación de la eficiencia de remoción de mercurio y plomo en el filtro Ekofil- Plus usado en el tratamiento de agua a nivel familiar(Universidad Santiago de Cali, 2019) Bacca Jordán, Maria Camila; Giraldo Tenorio, Giovanna Andrea; Silva Leal, Jorge AntonioThe limited availability of access to drinking water has led to the exploration of different forms and techniques of water treatment for human consumption, thus ensuring that its use does not create risks, for this reason the company REPLACOL has constructed ceramic filters that contribute to the potabilization on this precious and vital resource. According to the above, this research project was generated which aimed to measure to the effectiveness of EKOFIL PLUS clay filters, in terms of removal of mercury and lead complying with the norm 2115/2007 (MAVDT, 2007). This was done by comparing and analyzing factors influencing water quality from the synthetic mixture of the fluid with these metals. For this, during X days four filters, two Ekofil filters and two Ekofil plus filters were operated, under controlled laboratory conditions, measuring at different intervals pH, conductivity, turbidity, and the two response variables Hg and Pb. The results showed a removal of more than 90% of the filtered effluent in terms of heavy metals and values that oscillate within permissible limits for variables such as pH, conductivity and turbidity; which had a removal percentage of 96%.Item Evaluación del crecimiento y desarrollo vegetal del rábano a partir del aprovechamiento de los lodos en un sistema de tratamiento de agua residual(Universidad Santiago de Cali, 2024) Victoria Villalba, Hernán Felipe; Cárdenas Talero, José Luis; Silva Leal, Jorge AntonioIn recent years, population growth has significantly increased the demand for natural resources and the generation of wastewater. In this context, it is essential to integrate Wastewater Treatment Plants (WWTPs) into a circular economy. WWTPs produce reusable by-products such as gas, treated wastewater, and sludge. Stabilized sludge (biosolids) contains nutrients that can improve soil and substitute chemical fertilizers in agriculture. This study evaluates the suitability of secondary sludge and drying sludge from a WWTP with an extended aeration activated sludge system for use in radish cultivation. Pots of 0.7 L were used, and the treatments included a control group (soil and mineral fertilizer) and an experimental group with sludge applications at different rates, according to the nitrogen (N) and phosphorus (P) requirements for radish cultivation. The results showed that secondary sludge did not achieve optimal radish development compared to the controls. However, dehydrated sludge demonstrated beneficial effects, with significant increases in leaf area and plant biomass compared to the controls. Analysis of variance (ANOVA) and Tukey's test showed significant differences in the variables, highlighting dehydrated sludge at 2P dosage as the most effective. Dehydrated sludge significantly improved the growth and development of radishes, suggesting it as an effective and sustainable alternative, promoting sustainable agricultural practices and reducing dependence on chemical fertilizers. However, both secondary and dehydrated sludge present a risk due to pathogen content, underscoring the need to implement sanitization treatments to reduce this pathogen contentItem Evaluación del efecto de la plata coloidal sobre la calidad química del agua filtrada de dos modelos de filtros caseros(Universidad Santiago de Cali, 2019) Avilés Torres, Bryan Camilo; Narváez Garavito, María Alejandra; Silva Leal, Jorge AntonioThe purification of water and sanitation is a public health problem, where the technological gap in water treatment systems between the urban and rural population is evident, therefore, to minimize this problem, various treatment systems are implemented to supply water. Drinking water of communities with socio-economic limitations among them are the systems of home purification as the filter system by filtering bed of ceramic vessel. In this study we evaluated a ceramic pot filtration system, called Ekofil and Ekofil plus, which consists of a clay pot impregnated with colloidal silver and the Ekofil plus that has an activated carbon cartridge reinforcement impregnated with colloidal silver. The concentration of silver on the filtered effluent was evaluated in two models of ceramic pot filters used in the treatment of water for human consumption, for which the measurement of two types of synthetic water was carried out under controlled laboratory conditions for 10 weeks. The results obtained in both filtration models showed that the silver leaching was below the limit of 0.1 mg / L established by the EPA. According to the control variables pH, conductivity and turbidity, it was evident that the Ekofil filter was the one most in accord with what was established by Colombian regulations (Resolution 2115 of 2007) with a removal of 95.4%. Both systems of potabilization provide safe water in order to supply rural communities that do not have water treatment systems.Item Implementation of lean six sigma in higher education institutions: A comprehensive review(Universidad de Tarapaca, 2018-09-13) Guerrero Moreno, David Rodrigo; Silva Leal, Jorge Antonio; Bocanegra Herrera, Claudia CristinaLas metodologías de Lean Manufacturing, Six Sigma y Lean Six Sigma (LSS) han sido ampliamente implementadas en diversos ámbitos, escenarios e industrias; las Instituciones de Educación Superior (IES) no han sido la excepción; sin embargo, su implementación ha tenido y tiene barreras por superar. El propósito de este artículo es presentar un análisis de diversos escritos de estudio de casos en los que se ha implementado Six Sigma, Lean Manufacturing o su integración LSS en IES y de artículos conceptuales con el fin de examinar la manera en que se han aplicado estas metodologías en IES, sus motivaciones y principios necesarios requeridos para una efectiva implementación.Item Influence of the application of biosolids on the content of humic and fulvic acids in soil cultivated with sugar cane(Fundacion CIPAV, 2016-05-01) Silva Leal, Jorge Antonio; Madriñan Molina, R.; Torres Lozada, PatriciaThis study evaluated the effect of the application of biosolids from a municipal wastewater treatment plant on the content of humic and fulvic acids in vertic Endoaquept soil cultivated with sugar cane. Eight treatments with a randomized block spatial distribution are evaluated using experimental units of 6 m wide x 20 m long: i) control; ii) mineral fertilizer; iii) dehydrated biosolid 1N and 2N; iv) thermally dried biosolid 1N and 2N; and v) alkalized biosolid 1N and 2N (1N and 2N correspond to doses equivalent to one and two times the nitrogen requirement for sugar cane). The results show that while values of humic and fulvic acids showed no significant differences between the control, mineral fertilizer and alkalized biosolid treatments, the application of dehydrated and thermally dried biosolid treatments increased humic acid and fulvic acid content in the soil. This finding demonstrates the benefits of applying such biosolids.Item Performance evaluation of ceramic pot filters combined with adsorption processes for the removal of heavy metals and phenolic compounds(2021) Pérez Vidal, Andrea; Silva Leal, Jorge Antonio; Diaz Gómez, Jaime; Meneses Torres, Camilo J.; Arias Vallejo, Juan E.; Giraldo Tenorio, Giovanna A.; Bacca Jordán, Maria CamilaIt has been demonstrated that the ceramic pot filters (CPFs) with impregnated colloidal silver are efficient for the removal of turbidity and pathogens for household water treatment. This investigation evaluated the efficiency of two filter models for the removal of chemical contaminants (Hg, Pb, As and phenolic compounds) during 175 days. The first model is a traditional CPF impregnated with colloidal silver and the second consists of the ceramic silver-impregnated pot plus a post-filtration column with granular activated carbon and zeolite (CPF þ GAC-Z). The results of the CPF showed average efficiencies of 91.5% (Hg), 92% (Pb), 50.2% (As) and 78.7% (phenols). The CPF þ GAC-Z showed similar efficiencies for the removal of heavy metals (92.5% Hg, 98.1% Pb and 52.3% As) and a considerably higher efficiency for the removal of phenols (96.4%). The As concentration of the filtered water in both systems was higher than the regulatory limit. The ceramic pot was responsible for the highest removal of chemical compounds. It can be concluded that the traditional CPF is a viable option for water supply treatment at the household level for the removal of chemical contaminants. The efficiency of this filter can be improved with the post-filtration column mainly for the removal of organic constituents.Item Plan de gestión integral de residuos sólidos de las oficinas de la Alcaldía Municipal de Popayán(2017) Muñoz Ordoñez, Lina Fernanda; Bravo Jojoa, Yasmin Adriana; Silva Leal, Jorge AntonioItem Propuesta de planificación para establecer la reglamentación de sistemas urbanos de drenaje sostenible en Santiago de Cali(2017) Tascon Obando, Jhon Helmer; Santa Tello, Gisleine; Silva Leal, Jorge AntonioItem Propuesta metodológica de un proceso de desarrollo de software híbrido basado en modelo de madurez enfocado en el modelado de negocio para una fábrica de software pequeña o mediana(Universidad Santiago de Cali, 2019) Arias Castrillon, Jhoan Sebastián; Silva Leal, Jorge AntonioThere are standards that support the configuration of process management for an organization. They are called maturity models, it provides a collection of best practices for the development and delivery of high quality software applications. These models are extended areas to improve organizational performance in its internal and external management. They identify the strengths and weaknesses of the organization, as well as provide benchmarking information. There are many maturity models such as OPM3, CMMI, P3M3, PRINCE, BPMM, among others. Each model differs with the others in terms of its factors and characteristics. Now, while the models describe the "what" through guidelines to establish a process framework and measure the capacity and maturity of the adoption of an organization, there are software development processes and methodologies, such as RUP - AGILE - PMBOK - TSP , which are intended to detail the "how", using defined processes that can be easily customized according to the projects and the model. Therefore, the first objective of this study is to compare the models and find a maturity model suitable for the Colombian context and small and medium-sized companies, and the second is a mapping between the integration of the selected maturity model and the different processes and methodologies of the current market.Item Removal of E. coli and Salmonella in pot ceramic filters operating at different filtration rates(Elsevier Ltd, 2019-05-14) Pérez Vidal, Andrea; Rivera Sanchez, Sandra Patricia; Florez Elvira, Liliana Janeth; Silva Leal, Jorge Antonio; Diaz Gomez, Jaime; Herrera Cuero, Luisa Fernanda; Lopez Botero, Lina PaolaThe use of pot ceramic filters PCF to improve the domestic water quality supply has been recognized as an alternative in regions where there is unsecure water treatment or contamination of the treated water during transport and storage and an absence of safe drinking water. The aim of this study was to evaluate a model of PCF impregnated with colloidal silver under three filtration rates (1.0, 2.0 and 3.0 L/h) and three E. coli and Salmonella spp concentrations (104, 103 and 102 CFU/mL). The evaluation was made using spiked water having a turbidity of 29.9 ± 4.4 NTU and conductivity of 176 ± 31.7 μS/cm. The results showed a turbidity removal efficiency of 97% and average effluent of 0.9 NTU. The microbiological efficiency removal was of 2 Log Reduction Value (LRV) for E. coli and 1 LRV for Salmonella spp. There were not found significant statistical differences between the filtration rates and the removal efficiencies for turbidity E. coli and Salmonella spp. It was observed that the microbiological removal efficiency was affected by biofilm formation a phenomenon that was attributed to the presence of Salmonella spp. The combination of chemical and mechanical cleaning methods contributed to the elimination of the biofilm.Item Tecnologías de tratamiento aplicadas al manejo de lixiviados. Una revisión(Universidad Santiago de Cali, 2020) Gómez Amezquita, José Rafael; Silva Leal, Jorge AntonioSanitary landfills are currently one of the most widely used final disposal techniques worldwide, however, this technique brings with it the generation of biogas and leachate. The leachates are the product of the decomposition of the organic matter deposited in the landfills that, along with humidity and precipitation, carry a large amount of substances with them. The leachates are mainly composed of four general types of pollutants: organic compounds, dissolved heavy metals, organic and inorganic nitrogen and total dissolved solids, which make leachate a difficult product to treat, it is estimated that a ton of urban solid waste with a Moisture content between 30–35% will generate approximately 0.05–0.07 tons of leachate. This bibliographic review article presents the generalities, characteristics and variables that affect the composition of the leachate together with the existing treatment technologies. Among the implemented technologies, it was identified that the combined systems are the most used, in China more than 80% of the treatment plants combine physicochemical processes with membrane systems, in Colombia biological systems were found combined with advanced filtration systems in the treatment leachate.Item Tratamiento de aguas residuales para la eliminación de microcontaminantes emergentes(Universidad Santiago de Cali, 2020) De Jesús Murillo, Carlos Fernando; Silva Leal, Jorge AntonioEmerging pollutants are compounds produced mainly by municipal wastewater. The presence of these contaminants in the environment, despite not being significant in terms of concentration, does represent a potential health risk. It is known that they can interfere with the endocrine system and it is also suspected that they may have an incidence in other conditions such as cancer, neurological development problems, among others. Emerging contaminants can be classified into two main groups, which are Pharmaceutical and Personal Care Products (PPCP) and Endocrine Disruptors Chemicals (EDC). Conventional systems for wastewater treatment have been found to be ineffective in removing most emerging pollutants, so advanced treatments are necessary to reduce their concentration in wastewater effluents. In this context, a large number of investigations have been developed to evaluate the efficiency of different physical, chemical, and biological treatment techniques. Processes such as advanced oxidation (photocatalysis, ozonation, and fenton), ultrafiltration and nanofiltration, osmosis, adsorption, and other biological degradation treatments have shown promising results. This article presents a review of existing research in advanced wastewater treatment for the removal of emerging pollutants and their results and possible application are discussed.Item Using subsurface flow wetlands with phragmites australis as a bioremediation alternative for surface sources affected by acid drainage from coal mines(2021-11-01) Silva Leal, Jorge Antonio; Leal Magón, Ángela María; Arismendi Henao, Juan Pablo; Pérez Vidal, AndreaMining generates environmental impacts such as Acid Mine Drainage (AMD). The Cali River is one of the main water resources in the city of Santiago de Cali, Colombia and it is affected by drainage from abandoned mines, which reach the Cali River through the Las Minas brook. As bioremediation alternatives, the use of subsurface flow wetlands coupled with a limestone-based pretreatment was assessed in this study. The research methodology was structured in two stages: i) physicochemical monitoring of Las Minas brook waters, and ii) treatment system operations. For these purposes, four systems were evaluated: 1) Wetlands with plants (WL1), 2) Limestone + WL1 (LS + WL1), 3) Wetlands without plants (WL2) and 4) Limestone + WL2 (LS + WL2). The results revealed that the water from the Las Minas brook presents characteristics similar to AMD (pH: 2.4-4.0; acidity: 1,303.2 mg/L ± 139.2; iron: 715.3 mg/50 ± 70.6; sulfate: 1,134.5 mg/L ± 314.6) and affects the Cali River mainly owing to the increase in iron, aluminum, and the presence of ferric hydroxide precipitates. In addition, limestone-based treatment systems achieved greater efficiencies, and the LS + WL1 configuration is recommended. All systems were able to reduce the affluent acidity from 31% to 52%. Furthermore, the average iron removal efficiencies achieved were between 54% and 67%, sulfates between 16% and 35%, nickel between 25% and 50%, and aluminum between 0% and 73%. However, manganese could not be removed.