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Browsing by Author "Murillo Arango, Walter"

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    Remoción de Cr (Vi) en residuos líquidos de laboratorios de servicios analíticos por fotocatálisis heterogénea y bioadsorción
    (Corporación Universitaria Lasallista, 2018) Mera Córdoba, Jenny Alejandra; Espinosa Narváez, Gloria Sandra; Murillo Arango, Walter
    Introduction. Laboratories in the educational sector that offer analytical services and generate dangerous residues of Cr (VI) in their methods must adopt special measures for its elimination as it is a highly carcinogenic species of a negative environmental impact. Objective. Heterogeneous photocatalysis and bioadsorption environmental alternatives were evaluated in the removal of Cr (VI) in liquid waste generated in analytical services laboratories of the University of Nariño. Materials and methods .In both methods a factorial design 23 with high and low levels was applied, allowing to optimize the variables: pH = 1, amount of photocatalyst (TiO2) 0.5 g and 30 minutes of irradiation with UV light for the photocatalysis; and the variables: amount of bioadsorbent (green banana peel) 1g, pH = 1 and contact time of 60 minutes from Cr (VI) concentration of 100 mg / L for bioadsorption. The efficiency of the two methods was evaluated by comparing means and the assessment of technical and environmental feasibilitiy from matrices. Results. : From the liquid waste with a total chromium concentration of 2,116 mg / L, removal rates of 96.07 ± 0.65 % were obtained for photocatalysis and 99.9 % ± 0.01 for the bioadsorption process; the latter showing a better performance. Finally, the best technical and environmental feasibility was obtained for bioadsorption. Conclusion. Bioadsorption is shown as an eco-efficient process and is therefore presented as an environmentally sustainable option for the elimination of Cr (VI) in the management of hazardous waste.
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    Rendimiento de un Sistema Solar Fotovoltaico Mixto (Policristalinos y Amorfo) Usado como Suministro Energético en un Contexto de Tecnificación Cafetera
    (Unilasallista Corporación Universitaria, Editorial Lasallista., 2021) Idrobo Pacheco, Hermes Leonardo; Murillo Arango, Walter; Lara Galvis, Juan David; Chávez Ruiz, Daniel Fernando
    The use of renewable sources of energy, and especially photovoltaics, has become a key tool in the field of cleaner production, helping to promote sustainable development in many sectors, including agriculture, becoming an opportunity for momentum for the sector. Objective. This study evaluated the performance of a photovoltaic panel installation with two different technologies through the design and construction of an electronic data acquisition device comparing power curves. Materials and methods. Two types of panel technologies were considered (polycrystalline and amorphous) as the supply of electrical energy in the coffee processing process of the Parque Tecnológico del Café–TECNICAFÉ- SUPRACAFÉ, Cauca, Colombia. A hardware prototype with free software was designed on an Arduino board with a microcontroller capable of measuring the irradiance, power, and thermal response of each solar panel, and the energy generated with both types of installations (parallel and serial) was calculated. Voltage, electric current and temperature data were stored in the micro SD module of the card and then plotted as power delivery characteristic curves. The Results suggest the existence of a direct relationship between the power delivered by the panels and the irradiance variable. The polycrystalline panels delivered higher power than the amorphous ones, reporting a practical efficiency of 11% and 4.8% respectively. Conclusion. The design achieved in this research represents an opportunity to improve the energy performance of the coffee sector.