DSpace Repository :: Browsing by Author "Arroyave Rojas, Joan Amir"

Browsing by Author "Arroyave Rojas, Joan Amir"

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Degradación del colorante tartrazina mediante fotocatálisis heterogénea empleando lámpara de luz ultravioleta
(Área Metropolitana del Valle de Aburrá, 2012-08-10) Arroyave Rojas, Joan Amir; Garcés Giraldo, Luís Fernando; Arango Ruiz, Álvaro de Jesús; Agudelo López, Carlota Marcela; Martínez Rivera, Carlos Andrés
Introduction. The prevention and control of environmental pollution is one of the main responsibilities and concerns of modern men. In recent years a great number of research works have been made for such a purpose, among these we can remark pollutants biodegradation works. This is an advanced technique that aims to reduce or eliminate persistent compounds such as Azo dyes. Objective. To evaluate the degradation of the tartrazine dye by the use of heterogeneous photocatalysis with titanium dioxide and an ultra-violet light lamp. Materials and methods. A factorial randomized experimental design was used. For developing the experiment we used an ultra violet light lamp, a glass container for keeping the tartrazine dye in an aqueous solution and treat it and a pump that allowed the re-circulation of the solution through the photoreactor system. The degradation of the tartrazine dye was determined by the use of ultra-violet/visible espectrophotometry. Results. A good tartrazine dye removal rate was obtained (100,0%) for the combination of chemical oxidation by the use of 0 mg/L of TiO2 and,4 %v/v of the oxidation agent hydrogen peroxide, and the experimental combination of the photo chemical process of heterogeneous photocatalysis with the experimental rehearsals of 50 mg/L of TiO2 and 0,2 %v/v H2O2 and 50 mg/L of TiO2 and 0,4 %v/v H2O2 for a removal rate of 100,0%. Conclusion. Advanced oxidation processes are adequate for removing and eliminating the tartrazine dye.
Degradación y mineralización del colorante rojo punzó empleando el reactivo de Fenton
(Corporación Universitaria Lasallista, 2012) Arroyave Rojas, Joan Amir; Rodríguez Gaviria, Edna Margarita; Barón Aristizábal, Carlos Alberto; Moreno Salazar, Cristian Camilo
Introduction. This paper introduces the use of an advanced oxidation technique to remove and mineralize the ponceau red dye, which is widely used in food industries locally, nationally and internationally. Objective. To evaluate the degradation and the mineralization of the ponceau red dye, by the use of the Fenton reagent. Materials and methods. A reagent consisting of a glass bucket which served as a reservoir for the sample and for the degradation. Additionally, an internal mixture system was installed to keep the solution homogeneous during the experimentation period, which took two (2) hours. An initial concentration of 100 mg/L of the ponceau red dye was used, and the solution to be treated was kept as a pH of 3,0. The degradation of the dye was determined by the use of UV/Visible spectrophotometry at a 505 nm. Of wavelength and the mineralization was determined by the appearing of sulfates as a by-product of the degradation at 420nm of wavelength, according with the Sulfates parameter taken from the normalized methods to analyze water and waste water. Results. The degradation and the mineralization of the ponceau red dye was achieved by the use of several combinations of the Fenton reagent. Additionally, the best percentages of removal and mineralization of the dye obtained were 97,8 and 86,2%, respectively, by means of the combination of the Fenton reaction that corresponded to 10 mg/L of Fe 3+and 0,10 %v/v of the oxidation agent hydrogen peroxide. Conclusion. The Fenton reaction is adequate to degrade and mineralize the ponceau red dye and reaches high removal and mineralization percentages of that dye.
Empleo del reactivo de Fenton para la degradación del colorante Tartrazina
(Corporación Universitaria Lasallista, 2009) Arroyave Rojas, Joan Amir; Garcés Giraldo, Luís Fernando; Mejía Trujillo, Julieta
Objective. To evaluate the degradation of Tartrazine dye by using the Fenton´s reagent. We aim to implement an advanced oxidation technology in order to remove the Tartrazine dye, which is widely used in food industry locally, nationally and internationally. Materials and methods. A randomized factorial experimental design was used, with a reactor composed of a glass recipient as a reservoir to store the problem sample and the reaction place for the degradation. Additionally, an internal mixing system was arranged to keep the solution homogeneous during the experimental period (two hours). An initial 100 mg/L concentration of Tartrazine was used, and the solution was kept at a 3.0 pH level. The dye´s degradation was determined by the use of UV/Visible spectrophotometry at a 425 nm wavelenghht. Results. The removal and degradation of the Tartrazine dye was achieved using different combinations of the Fenton´s reagent´s oxidation. The best removal percentage was, however, 99.3 % of the dye, by the combination of the Fenton´s reaction corresponding to 25 mg/L of Fe 3+ and 0,4 %v/v of the Hydrogen peroxide oxidation agent. Conclusion. Fenton´s reaction is adequate and achieves high removal and degradation percentages of the azo Tartrazine dye.
Environmental protection zones priorization for the decision making support
(Corporación Universitaria Lasallista, 2013-10-26) Builes Jaramillo, Luis Alejandro; Lotero Vélez, Laura; Arroyave Rojas, Joan Amir
Introduction. Air quality assessment deal with emission, concentration levels and definition of polluted areas, the results are often related with command and control regulations or restriction to transportation and industrial activities. This kind of approaches gives to environmental and territorial planners areas for special management and use. Objectives. Facilitate the priorization of those polluted areas in terms of future interventions to decision makers, integrating public health and demographic indicators to a previous planning exercise through, an Analytic Hierarchy Process (AHP) approach. Materials and methods. With an AHP developed via surveys for territorial and environmental planning experts, it was possible to define the importance weight and relevance of new indicators in the decision making exercise of prioritization of polluted areas in Medellin. The indicators were chosen from public databases of demographic and public health information and one of them (demographic) with a prospective time frame. Results. Experts in territorial planning tends to give more importance to health indicators for the prioritization of intervention in polluted areas, while the inclusion of a prospective indicator was useful in the definition of which of the areas should be the first or the most critical for intervention. The results also show that experts seem to have problems in structuring their decisions presenting some inconsistencies in their answers. Conclusion. We present clear cut results showing that the inclusion of new variables, especially those dealing with prospective information in previous air quality planning exercise is useful for the strategic decision making process.
Evaluación de la degradación del pesticida Mertect empleando procesos avanzados de oxidación (PAO)
(Corporación Universitaria Lasallista, 2012-03-29) Arroyave Rojas, Joan Amir; Garcés Giraldo, Luís Fernando
Introduction. In this moment, an application of advanced oxidation processes (AOP) is being developed. They are based on technologies for the destruction of pollutants by the use of chemical substances known as hydroxyl free radicals, which have high oxidation properties. Those radicals react with the pollutant and transform it into environmentally harmless compounds. For the specific case of Mertect pesticide several advanced oxidation processes have been studied, among which chemical oxidation, photolysis and homogeneous and heterogeneous photocatalysis can be remarked. They aim to degrade this pollutant and thus reducing the negative impacts it can bring to the environment. Objective. To evaluate the degradation efficiency of the Mertect pesticide by the use of advanced oxidation processes (AOP). Materials and methods. For the experimental part of the project, a factorial 33 experimental design was proposed. For this design it was used a photo reactor that consisted on an ultra violet light lamp, a glass container to keep the solution of the pesticide to be degraded and a submersible pump that allowed the solution to recirculate through the treatment system. The degradation of the pesticide was measured by ultra violet/visible spectrophotometry. Results. Photochemical processes based on heterogeneous photocatalysis with titanium dioxide – TiO2– and homogeneous photocatalysis with iron (III) have significant removal rates of the Mertect pesticide, above 99.0% and 95.0%, respectively, for the aforementioned oxidation processes. Conclusion. Advanced oxidation processes are adequate for the removal and degradation of the Mertect pesticide.
Evaluación económica de la captación de agua lluvia como fuente alternativa de recurso hídrico en la Institución Universitaria Colegio Mayor de Antioquia
(Área Metropolitana del Valle de Aburrá, 2009) Arroyave Rojas, Joan Amir; Díaz Vélez, Juan Camilo; Vergara, Diana Marcela; Macías, Natalia David
Introduction. There are sustainable technologies that not only aim to reduce pollution, but to prevent environmental problems. The main principles recommended for technological projects to use and clean water are based on the maximum reuse of clan and semi-clean water, flow reduction and waste separation in the production place, keeping them away from watercourses and treating them separately. Objective. To evaluate, both technically and economically, the rain water harvesting as an alternative water source at Institución Universitaria Colegio Mayor de Antioquia. Materials and methods. Basic historical information about the consumption and demand of water in the institution was collected. A search for alternative water sources was proposed, quantifying the amount of water that could be harvested with the rain water system of the building, in order to store and distribute that water. On the other hand, an analysis and an economic projection of the implementation of this project were made. Results. It was determined that, according with the precipitation rate, Institución Universitaria Colegio Mayor de Antioquia has a great potential for rain water harvesting for using it as an alternative source of water to be stored and distributed, thus reducing the demand and consumption of drinking water from the aqueduct of Empresas Públicas de Medellín. This means a cost saving in water bills of about $768.250 a month, and a reduction in the demand of environmental goods and services related to water of 384 m³. Conclusions. The implementation f sustainable construction projects related to water and the use of rain water as an alternative water source can be economically, sociably and environmentally feasible, according to the analysis of the context in which the Project is implemented.
Fotodegradación de las aguas residuales con pesticida Mertect en la industria bananera empleando Fotocatálisis con Dióxido de Titanio y Lámpara de Luz Ultravioleta
(2007) Arroyave Rojas, Joan Amir; Garcés Giraldo, Luís Fernando; Cruz Castellanos, Andrés Felipe
Introduction. Pesticides are synthetic chemical compounds with the characteristic of being persistent, thus helping to contaminate water and incorporating pollutants to the soils and to edible vegetables and animals that, when eaten, act as pesticide transporters, accumulating that pesticide in living organisms from all the links of the trophic chain. This is the reason for the great importance of the degradation and decontamination processes of this kind of pollutants. Objective. To evaluate the photodegradation of the Mertect pesticide by the use of photocatalysis with titanium dioxide and ultra violet light. Materials and methods. In the experiment, an ultra violet light lamp, a glass bucket to store the pesticide to be degraded and a bomb to recirculate the solution trough the treatment system were used. The degradation of the pesticide was determined by visible/ultraviolet spectrophotometry. For the information analysis the 23 experimental factorial designs was used, under complete balance. Results. The highest removal percentage was 99.5%, obtained for two experimental conditions: 50 mg /L of titanium dioxide and 1% v/v of hydrogen peroxide, and 100mg/L of titanium dioxide and 1%v/ v of hydrogen peroxide. Conclusions. Advanced oxidation processes are adequate to remove and eliminate the Mertect pesticide in the waste waters from the banana industry.
Fotodegradación del pesticida Mertect empleando fotofenton con lámpara de luz ultravioleta
(Corporación Universitaria Lasallista, 2006) Arroyave Rojas, Joan Amir; Garcés Giraldo, Luís Fernando; Cruz Castellanos, Andrés Felipe
Introduction. Prevention and control of environmental pollution is one of the main responsibilities and preoccupations of modern men. In recent years, a significant number of research works have been being done in order to prevent and control of such pollution. Among these, photodegradation of pollutants is a part of the advanced oxidation technologies, which aims to reduct and/or elliminate toxic and persistent compounds such as pesticides, which are now part of the environment. Objective. To evaluate the photo degradation of the Mertect pesticide, by the use of photofenton with an ultra violet light lamp. Materials and methods. An experimental factorial 2x3 design was used, and an ultra violet light lamp was used for it. Also, a glass vat was used to keep the pesticide solution to be degraded and a bomb that allowed the solution´s re- circulation through the treatment system. The pesticide’s degradation was determined by the use of visible/ultra violet espectrophotometry. Results. The highest percentage of degradation was achieved with the use of hydrogen peroxide as an oxidation agent (98,7%), followed by the photochemical processes of the photofenton in an experimental combination of 50 mg/L of iron and 1% v/v of hidrogen peroxide (95,6%). Conclusion. Advanced oxidation processes are adequate for wiping and elliminating Mertect pesticide.
La gestión socio-ambiental y el recurso hídrico
(Corporación Universitaria Lasallista, 2012-08-30) Arroyave Rojas, Joan Amir; Builes Jaramillo, Luis Alejandro; Rodríguez Gaviria, Edna Margarita
This paper is a reflection about the way human beings have established their relationship with the environment and how it has brought difficulties in the environmental management. It emphasizes on the planning and the management of water resources, making a general review of the advances in the regulation associated to water that has impacted the management. Finally, it proposes a discussion about a change of the paradigm and of the social and the environmental cultures favoring a better social/environmental management of water resources, procuring its sustainability at all of the different scales.
La Tartrazina, un colorante de la industria agroalimentaria, degradado mediante procesos de oxidación avanzada
(Corporación Universitaria Lasallista, 2008) Arroyave Rojas, Joan Amir; Garcés Giraldo, Luís Fernando; Arango Ruiz, Álvaro de Jesús; Agudelo López, Carlota Marcela
Introduction. The prevention and control of environmental pollution is one of the main responsibilities and preoccupations of modern people. In the latter years, a considerable number of research works concerning this subject have been registered. Among these, photodegradation of pollutants is a part of the group of the advanced oxidation technologies that aim to reduce or eliminate persistent compounds such as the Azo dyes. Objective. To evaluate the degradation of the Tartrazine dye by the use of heterogeneous photo catalysis with titanium dioxide and an ultra violet Light lamp. Materials and methods. An experimental factorial randomized design. For the experimental development, an ultra violet light lamp, a glass recipient for keeping the Tartrazine dye in acuose solution for its treatment and a bomb that allowed the recirculation of the solution through the photo reactor´s system were used. The degradation of the Tartrazine dye was determined by using ultraviolet/ visible spectrophotometry. Results. A good removal index of the Tarzatrine dye was obtained for the combination of chemical oxidation by the use of 0 mg/L of TiO2 and 0,4%v/v of the hydrogen peroxide oxidation agent , and same result was obtained for the experimental combination of the photochemical process of heterogeneous photo catalysis with experimental rehearsals with 50 mg/L of TiO2 and 0,2%v/ v H2O2, and 50mg/L of TiO2 and 0,4%v/v H2O2 for a removal percentage that equals 100,0%. Conclusion. The advanced oxidation processes are adequate for removing and eliminating the Tartrazine dye.
Mineralización del colorante Tartrazina mediante un proceso de oxidación avanzada
(Corporación Universitaria Lasallista, 2009) Arroyave Rojas, Joan Amir; Garcés Giraldo, Luís Fernando; Arango Ruiz, Álvaro de Jesús
Introduction. The importance of treating waste waters is based on removing the contaminants and the mineralization of the components into compounds harmless for the environment, aiming to reduce the impact and the environmental misbalance generated by the presence of undesired substances in the aqueous ecosystems. Objective. To evaluate the mineralization of the Tartrazine dye by the use of heterogeneous photo catalysis with titanium dioxide and an ultra violet light lamp. Materials and methods. An experimental randomized factorial design was used. In the experiments, an ultra violet light lamp, a glass reservoir to store the aqueous solution sample and a pump to re-circulate the solution, were used. The mineralization was determined by the ultra violet /visible espectrophotometry, using sulfates for the parameter, and the removal of sulfates was calculated at different concentration times. Results. Mineralization percentages of the Tartrazine dye above 92.8% were achieved. Nevertheless, when technical and economic factors were analyzed, it was considered that the most adequate experimental combination to achieve the dye’s mineralization corresponds to a combination of 0mg/L of TiO2 and 0,2 % v/ v of the hydrogen peroxide oxidation agent, which represents a chemical oxidation process. Conclusion. Advanced oxidation processes, such as chemical oxidation with hydrogen peroxide, are beneficial for the mineralization of the Tartrazine dye.
Photo degradation of the tartrazine dye by means of photofenton, using an ultra violet light lamp
(Corporación Universitaria Lasallista, 2008) Arroyave Rojas, Joan Amir; Garcés Giraldo, Luís Fernando; Arango Ruiz, Álvaro de Jesús; Agudelo López, Carlota Marcela
Introduction. All of the production systems demand natural resources to make goods and services, and therefore requires environmental services as inputs and for the disposal of its waste. Food industry is not the exception to this problem, the generation of waste with dyes has a negative impact on all of the water sources in the country, the presence of color in the water deteriorates the aesthetics of water bodies and also generates environmental misbalances because color is an obstacle to the pass of sunlight in the water surface, avoiding the photo synthesis of algae in rivers and brooks. When photo synthesis is avoided, as it is the first link of the food chains, a general misbalance takes place in the ecosystems, because zooplankton and fish species feed from algae, and the economy of villages and towns located at water shores in the country depend mainly on those fish species. Objetive. To evaluate the degradation of the Tartrazine dye using photo catalysis with iron (iii) and an ultra violet light lamp. Materials and methods. An experimental randomized factorial design was used; for the experimental development, we used a photo reactor system, which consists on an ultra violet light lamp, a glass container to keep the sample to be treated and a submersible pump that allows the re-circulation of the solution through the photo reactor system. The degradation of the Tartrazine dye was determined by the use of ultraviolet/visible espectrophotometry. Results. A good percentage of the Tarzatrine dye removal (100,0%) was obtained for the combination of chemical oxidation by using 0 mg/L of Fe 3+ and 0,4 % v/v of hydrogen peroxide as oxidation agent, and also the experimental combination of the photo chemical process of homogeneous photo catalysis and the experimental rehearsal of 50 mg/L of Fe 3+ and 0,2 % v/v H2O2; It is also considered that the combinations of 0 mg/L of Fe 3+ and 0,2 %v/v H2O2 and 50 mg/L of Fe 3+ and 0,4 % v/v H2O2 reach very important removal percentages, above 99,0 %, of degradation. Conclusion. Advanced oxidation processes, as homogeneous photo catalysis, are adequate for the removal and elimination of the Tartrazine dye.
Tecnologías ambientalmente sostenibles
(Corporación Universitaria Lasallista, 2012-07-11) Arroyave Rojas, Joan Amir; Garcés Giraldo, Luís Fernando
Modern reflections concerning environmrental problems, seeking for a reduction of negative impacts oin environment, have boosted the appearance of nacional and internacional initiatives Ander the general initiative of cleaner production. This is a prevention managerial strategy applied to products, processes and work organization, aiming to minimize pollution and leaks in the source, reducing risks for human health and environment and increasing competitiveness. Thus, cleaner Technologies are created to develop the cleaner production phylosophy, and make it feasible.

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