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Sánchez Alvarracín, Carlos Mauricio

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Birth Date

1978-06-07

ORCID

0000-0003-4521-6158

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57209801950

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Universidad de Cuenca, Cuenca, Ecuador
Universidad de Cuenca, Facultad de Ciencias Químicas, Cuenca, Ecuador
Universidad de Cuenca, Carrera de Ingeniería Ambiental, Cuenca, Ecuador
Universidad de Cuenca, Departamento de Recursos Hídricos y Ciencias Ambientales, Cuenca, Ecuador

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Ecuador

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Facultad de Ciencias Químicas
Fundada en 1955 como la Escuela de Química Industrial, la facultad ha sido un pilar fundamental en la formación de profesionales altamente capacitados, comprometidos con el desarrollo de la ciencia, la educación y el bienestar social. La Facultad de Ciencias Químicas pone a consideración su trabajo académico, investigativo y de vinculación con la sociedad, desarrollado a través de la práctica de una docencia de calidad, investigación e innovación en su área de estudio. Desde su oficio de conocimiento se permite contribuir a la sociedad con cuatro carreras: Bioquímica y Farmacia, Ingeniería Química, Ingeniería Ambiental e Ingeniería Industrial. Su carta de presentación en la Academia, la coloca como una dependencia dinámica, donde confluye la solidez de una trayectoria de más de sesenta años. Aquí se trabaja en una continua formación de pregrado y posgrado de la más alta calidad, mediante la mejora continua con la innovación y a la vanguardia de las ciencias químicas.

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Sánchez Alvarracín

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Carlos Mauricio

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Now showing 1 - 4 of 4
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    Publication
    Effect of residual chlorine on copper pipes in drinking water systems
    (2019) Flores del Pino, Lisveth; Vazquez Garcia, Sandra Elizabeth; Sánchez Alvarracín, Carlos Mauricio; García Ávila, Fausto Fernando; Garcia Altamirano, Diana Catalina; Zhindón Arévalo, César; Bonifaz Barba, Gabriel Alejandro; Ramos Fernández, Lia
    © 2019 Eastern Macedonia and Thrace Institute of Technology. Copper pipes corrosion that transport potable water can deteriorate water quality within a distribution system, releasing high copper amounts, exceeding the maximum concentration copper for potable water standards. This study examines the influence of free chlorine on the leaching of copper in the pipes used for the distribution of drinking water. A series of tests was carried out using corrosion test coupons extractable constructed of copper material. The coupons were installed in units containing filtered water (without chlorine, 0 mg/L) and water treated with an average residual chlorine concentration of 0.85 mg/L in the water treatment plant in Azogues city, Ecuador. A corrosion test rack was also installed in a house with an average residual chlorine concentration of 0.37 mg/L. Coupons in these sites were exposed in duplicate for one, two, three and six months. The corrosion coupons were then extracted and weighed to establish the corrosion rate by gravimetric technique. Additional tests were performed in static immersion laboratory tests using drinking water with chlorine concentrations ranging from 0.25 to 5 mg/L for one month. The weight loss tests indicated that an increase in free chlorine concentration, the greater release of copper and therefore a higher corrosion rate.
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    Relationship between chlorine decay and temperature in the drinking water
    (2020) García Ávila, Fausto Fernando; Sánchez Alvarracín, Carlos Mauricio; Cadme Galabay, Manuel Remigio; Conchado Martinez, Julio Hector; Garcia Mera, George Adalberto; Zhindon Arevalo, Cesar Edmundo
    The bulk chlorine decay rate in drinking water supply systems depend on many factors, including temperature. In this document, the method to determine the order of reaction of chlorine with water is reported, as well as the method to estimate Kb (Bulk reaction rate constant). Experiments were carried out to determine the bulk chlorine decay, for which a set of water samples to determine the free residual chlorine every hour were analyzed. Chlorine concentrations were graphed against time and adjusted appropriately to the developed model. The experimental results showed that the average value of the mass decomposition rate was 0.15 h−1. It was shown that temperature affects the variation of the reaction rate of chlorine with water, Kb increases as temperature increases. In this manuscript it is reported: • The method that allows determining the reaction kinetic order of chlorine with drinking water. • The method that can help residual chlorine modelers in the correct definition of the bulk reaction rate constant. • The effectiveness of the method for evaluating the decomposition of residual chlorine in drinking water distribution networks as a function of temperature.
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    Publication
    Domestic wastewater treatment at the single-family level using a septic tank and constructed wetland system: a scientometric and systematic analysis
    (2023) García Ávila, Fausto Fernando; Albuja Arias, Daniela Alexandra; Criollo Bravo, Jéssica Ximena; Sánchez Alvarracín, Carlos Mauricio; Vivar Martínez, Edgar Fabián
    The study of wastewater treatment at the single-family level is of great interest to researchers around the world. This study focused on making a scientometric analysis and a systematic review of the treatment of domestic wastewater at the single-family level through a septic tank (ST) and constructed wetland (CW) system. For which the publications from 2002 to 2022 registered in the Scopus database were recovered. For the systematic review, the PRISMA approach was used to verify the efficiency of the wastewater treatment system integrated by an ST and CW. After the respective exclusion, a total of 166 articles were obtained. The findings of this study revealed that the leading countries in this field of research are the USA, Brazil, China, Norway, and Poland. The most recurrent words were artificial wetlands, septic tanks, and domestic wastewater. The systematic review showed that the integration of an ST with a CW is an alternative for wastewater treatment at the single-family level. This integrated system allows the achievement of high BOD5 and COD removal efficiencies. Meanwhile, the removal of phosphorous and nitrogen has been moderate. However, research is needed on the costs and reuse of the effluent from this treatment system; as well as, to evaluate the efficiency of the application of deflectors in the STs and the use of ornamental plants in the CWs. This study helps researchers in this field to identify sanitation trends that have emerged in the last 20 years, serving as a reference for future research.
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    Sentinel satellite data monitoring of air pollutants with interpolation methods in Guayaquil, Ecuador
    (2023) Mejía Coronel, Julio Danilo; Macancela Encalada, Diana Magali; Sánchez Alvarracín, Carlos Mauricio; Alvarez Pucha, Hermel Daniel
    In Ecuador, there is a limitation on air quality monitoring due to the cost of monitoring networks. Although air quality monitoring stations are instruments for air measurement, they do not cover an entire city due to their scope. Satellite remote sensing is now an effective tool to study atmospheric pollutants and has been applied to continuously assess a region and overcome the limitations of fixed stations. Despite the application of satellite data for air quality monitoring, there are some limitations, such as measurement frequency, cloud cover and wide spatial resolution, which do not allow the assessment of air pollution in cities. Therefore, downscaling, applying interpolation methods, is essential for continuous air quality monitoring at smaller scales. For this research, Nitrogen Dioxide (NO2) data from the Sentinel-5 satellite percussor was used in the city of Guayaquil for January–December 2020, which is considered before, during and after the COVID-19 quarantine. This mid-size port city does not have a permanent monitoring network, which prevents us from knowing the air quality. Due to the limitation of pixel size, this study used satellite data to apply interpolation techniques and reduce pixels to assess air quality. Two categories of interpolation were selected: deterministic and stochastic. The empirical Bayesian kriging (EBK) interpolation obtained a R2 of 0.9546, which was superior to the other methods applied. Therefore, the EBK method had the best accuracy for tropospheric NO2 concentration. Finally, the method used in this research can help monitor air quality in cities lacking continuous monitoring networks, as the reduction of the pixel size gives us a better pattern of pollutants.