Recovery, separation and production of fuel, plastic and aluminum from the Tetra PAK waste to hydrothermal and pyrolysis processes

The establishment of a method of separation of materials from Tetra Pak waste to obtain products for use as raw material, fuel or other purposes was investigated in this study. First, the feasibility of hydrothermal treatment for the production of a solid fuel (hydrochar) and solid fraction formed by polyethylene and aluminum, called composite was analyzed. The results indicated that hydrothermal treatment performed at 240 ◦C yield the formation of hydrochar with good properties for its use as fuel and a composite of polyethylene and aluminum. The best conversion and separation of the cardboard and polyethylene/aluminum were obtained using 120 min as operating time. Then, the recovery of the aluminum fraction from the composite by using spent olive oil waste was studied. A partial separation of the composite layers (polyethylene and aluminum) was accomplished with improved aluminum purity for higher operating temperatures. Finally, the operating conditions of the pyrolysis process for the production of a solid (char) and high purity composite (aluminum) were optimized. The characterization results indicated that both char and aluminum resulting from the pyrolysis of the Tetra Pak at 400 ◦C still have a significant amount of polyethylene while higher purity levels of aluminum can be obtained at temperatures equal of higher than 500 ◦C

Evaluación de la presencia de huevos de Toxocara en suelos de una zona árida en la región centro-oeste Argentina

Con el objetivo de estudiar la contaminación de los suelos con huevos de Toxocara spp, se obtuvieron 76 muestras de suelo de 18 pueblos pertenecientes a 6 provincias del centro-oeste de Argentina. Las muestras fueron procesadas por el método de centrifugación-flotación. No se encontraron huevos de Toxocara spp. en ninguna de las muestras de suelo. Llegamos a la conclusión de que los resultados negativos podrían estar en relación directa con las características ambientales y climáticas presentes en el área estudiada. El hallazgo o no de huevos en el suelo depende de varios factores: la presencia de heces de caninos o felinos, el comportamiento de los dueños de mascotas, la presencia de animales abandonados y sin control veterinario, las condiciones climáticas y ambientales y las técnicas de laboratorio utilizadas. Todas estas circunstancias deben ser consideradas cuando se comparan los resultados encontrados en diferentes regiones geográficas. Con el fin de definir la importancia que tienen los espacios públicos en la transmisión de la infección a los humanos, se debería considerar el papel que tienen los patios y veredas de las viviendas en las ciudades pequeñas, donde la población no acostumbra a pasear mascotas en parques y plazas, y en esos casos, la población puede adquirir la infección dentro de los hogares.With the aim of studying the contamination of soils with eggs of Toxocara spp. in an arid area in the central-western region of Argentina, 76 soil samples were collected from 18 towns belonging to six provinces of central-western Argentina. They were processed by the centrifugal flotation method. No eggs of Toxocara spp. were found. It can be concluded that the negative results are directly related to the characteristics of the environment and climate present in the studied area. The finding of eggs in soils depends on several factors: the presence of canine or feline feces, the hygienic behavior of pet owners, the presence of stray animals without veterinary supervision, the weather and environmental conditions, and laboratory techniques used; and all these circumstances must be considered when comparing the results found in different geographical regions. In order to accurately define the importance of public spaces in the transmission of infection to humans, it is important to consider the role of backyards or green spaces around housing in small towns, where the population is not used to walking pets in public spaces, and in such cases a significant fraction of the population may acquire the infection within households

Influence of Gemetrical and Thermal Parameters on the Thermal Comportment of a Pin-on-Disk System

Strong temperature gradients are often the cause of malfunctions taking place in mechanical systems which associate two rubbing solids. This work presents the thermal behaviour of a system consisting on a rotating disk in rubbing contact with a pin. Immersed in an environment characterized by a surface conductance h and a temperature Tf , the disk is subjected to localised heat flux generated by the friction with the pin, eccentric with respect to the rotating axis of the disk. Several parameters intervene decisively on the local heat transfer and therefore on the temperature of the contact surface between the two solids in friction. In addition to the conductance, other parameters as the angular velocity of the disk, the frictional heat flux or the pin diameter and its off center with respect to the disk rotation axis, play a major role in the thermal exchange. The present work examines the influence of such parameters on the thermal solution. An analytical expression is proposed for the calculation of the 3D disk´s temperature. The presented thermal cartographies make possible to locate the zones of the system undergoing the greatest temperature gradients and thus the associated spots of mechanical rupture. Results are compared with other analytical solutions found in the specialized literatu

Assessment of the presence of Toxocara eggs in soils of an arid area in Central-Western Argentina

With the aim of studying the contamination of soils with eggs of Toxocara spp. in an arid area in the central-western region of Argentina, 76 soil samples were collected from 18 towns belonging to six provinces of central-western Argentina. They were processed by the centrifugal flotation method. No eggs of Toxocara spp. were found. It can be concluded that the negative results are directly related to the characteristics of the environment and climate present in the studied area. The finding of eggs in soils depends on several factors: the presence of canine or feline feces, the hygienic behavior of pet owners, the presence of stray animals without veterinary supervision, the weather and environmental conditions, and laboratory techniques used; and all these circumstances must be considered when comparing the results found in different geographical regions. In order to accurately define the importance of public spaces in the transmission of infection to humans, it is important to consider the role of backyards or green spaces around housing in small towns, where the population is not used to walking pets in public spaces, and in such cases a significant fraction of the population may acquire the infection within households.Facultad de Ciencias Médica

Exploración de grafos para el análisis de datos

Se propone una técnica de análisis de datos a través de la exploración de redes que se forman con entidades existentes en la base de datos de estudio. El principal aporte del método es la exploración de la red a través de ambientes definidos por los demás atributos de la base de datos. Este método ha sido utilizado con éxito en el análisis de datos biológicos relacionados con el Mal de Río Cuarto virus. Se presenta además a Yatel, la herramienta en desarrollo que da soporte al análisis propuesto.Eje: Bases de Datos y Minería de DatosRed de Universidades con Carreras en Informática (RedUNCI

Exploración de grafos para el análisis de datos

Se propone una técnica de análisis de datos a través de la exploración de redes que se forman con entidades existentes en la base de datos de estudio. El principal aporte del método es la exploración de la red a través de ambientes definidos por los demás atributos de la base de datos. Este método ha sido utilizado con éxito en el análisis de datos biológicos relacionados con el Mal de Río Cuarto virus. Se presenta además a Yatel, la herramienta en desarrollo que da soporte al análisis propuesto.Eje: Bases de Datos y Minería de DatosRed de Universidades con Carreras en Informática (RedUNCI

Exploración de grafos para el análisis de datos

Se propone una técnica de análisis de datos a través de la exploración de redes que se forman con entidades existentes en la base de datos de estudio. El principal aporte del método es la exploración de la red a través de ambientes definidos por los demás atributos de la base de datos. Este método ha sido utilizado con éxito en el análisis de datos biológicos relacionados con el Mal de Río Cuarto virus. Se presenta además a Yatel, la herramienta en desarrollo que da soporte al análisis propuesto.Eje: Bases de Datos y Minería de DatosRed de Universidades con Carreras en Informática (RedUNCI