Unidad de Posgrados

URI permanente para esta comunidadhttp://repositorio.uta.edu.ec/handle/123456789/11

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2017 - 201912020 - 20221

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Tema: search.filters.subject.CURTIEMBRES

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  • Miniatura
    Item type:Ítem,
    Remoción de cromo hexavalente en aguas residuales a partir de tratamientos electroquímicos en la empresa Tenería Núñez
    (Universidad Técnica de Ambato. Facultad de Ingeniería en Sistemas, Electrónica e Industrial. Maestría en Química, 2022)
    Morales León, Vanessa Belén
    ;
    Pérez Aldás, Lander Vinicio
    Hexavalent chromium is a highly toxic metal and is considered one of the pollutants with the greatest environmental impact. The electro oxidative system with titanium mesh electrodes was applied as a feasible alternative in the wastewater treatment of Tenería Núñez. Specifically, the activities developed in this research establish as an initial stage the design and construction of an electrolytic cell, where the indirect anodic oxidation process was carried out, giving rise to the generation of oxidizing radicals, which will be found in the form of bubbles that reduce the hexavalent chromium Cr (VI) of the wastewater by a bubbling process with oxygen particles produced in the electrolysis process. The method of Cr (VI) content quantification applies visible spectrophotometry at a wavelength of 540 nanometers (nm). The variables applied varied the electrochemical reaction time (30 minutes, 60 minutes and 120 minutes) and electrical voltage (5, volts, 10 volts and 20 volts), as the time and electrical voltage were higher the percentage of Cr (VI) removal increased. The removal of Cr (VI) improved when the electrolysis time was 120 minutes and the electrical voltage was 20 volts in the treatments used. The research evaluated the removal capacity of Cr (VI) from oxidation with oxygen bubbles as a secondary wastewater treatment process so that the removal efficiency of this parameter substantially decreases the toxicity of this analyte.
  • Miniatura
    Item type:Ítem,
    Manejo manual de cargas y su incidencia en los trastornos músculoesqueléticos de los trabajadores del área de ribera de la Curtiduría Promepell S.A.
    (Universidad Técnica de Ambato. Facultad de Ingeniería en Sistemas, Electrónica e Industrial. Maestría en Seguridad e Higiene Industrial y Ambiental, 2017)
    Grefa Tanguila, Georgina Dalila
    ;
    Rivera Escobar, Mario Fernando
    EXECUTIVE SUMMARY This investigative study focus on the facilities of the Promepell S.A Tannery, located in the province of Tungurahua, based on the initial identification and medical examinations are detected problems of musculoskeletal disorders in the workers of the ribera area, which comprises job positions such as unhairing, fleshing and splitting leathers in wet condition. Due to the problematic and based on the theoretical basis it is found that the manual handling of leather is one of the main risk factors that cause occupational diseases specifically musculoskeletal disorders in the tannery sector. In order to determine the incidence of manual handling of loads in musculoskeletal disorders, evaluations are carried out using the National Institute for Occupational Safety and Health (NIOSH) method for lifting loads, ISO 11228-2 method to determine the force of pushing and dragging of loads, the method of evaluation of manual handling of loads according to the Technical Guide of the National Institute of Safety and Health at Work (INSHT), where the index of lifting in the splitting is of 1.4, level of moderate risk, the index of initial strength and sustained force in the unhairing is greater than 1 corresponding to an unacceptable level of risk. In addition, the individual survey and the questionnaire for musculoskeletal disorders are applied to six workers in the ribera area, with 5 out of 6 workers showing discomfort at the back-column level, in addition to neck, shoulders and hands. With regard to medical examinations, scoliosis, hyperlordosis, hyperciphosis and rectification of the spine are the main musculoskeletal disorders suffered by workers. Once the results of the evaluation are obtained, a program of prevention of musculoskeletal disorders applied to the ribera area is proposed, in order to reduce the levels of risk from source, medium and worker.