Envíos recientes

Computational fluid dynamics (CFD) and it´s use for analysis of gas distribution inside animal production facilities: a literature review

Alves Damasceno, Flávio | 2011-07

Currently, one of the most discussed subjects in commercial livestock production is the emission of gases and temperature distribution, associated to climate change and animal welfare, principally with gas as methane (CH4) and ammonia (NH3). Application of computational fluid dynamics (CfD) for predicting the occurrence of these gases, especially in the animal production sector, is becoming increasingly important. Along the years, the versatility, precision and ease of use offered by CfD has caused its greater acceptance by the agricultural and animal engineering community. Therefore, CfD is regularly utilized to solve environmental problems associated to climate control in commercial animal production installations. Due to a better combination between computational simulation in CfD and mathematical modeling, realism of these simulations has become more reliable in recent years. Based on these facts, the goal of this study was to showed the recent studies using commercial Computational fluid Dynamics (CfD) to determinate the behavior and distributions of gases inside animal production installations, showing the advantages and limitations of the technique.

Efecto del pretratamiento térmico de residuos de alimentos sobre la producción de metano

Parra Orobio, Brayan Alexis | 2019-01

Los residuos de alimentos son el componente principal de los residuos sólidos municipales y dado su elevado contenido de materia orgánica tienen alto potencial de producción de metano, mediante la digestión anaerobia; sin embargo, la predominancia de material lignocelulósico dificulta su hidrólisis. En este estudio, mediante ensayos de potencial bioquímico de metano, se evaluó el efecto de diferentes condiciones de pretratamiento térmico del sustrato, aplicando temperaturas entre 72 – 128°C y tiempos de exposición de 15 – 33 minutos sobre el rendimiento de producción de CH4. Para evaluar el efecto de las condiciones de pretratamiento, se empleó la metodología de superficie de respuesta y la aplicación de los modelos cinéticos de primer orden y de ajuste de Gompertz modificado. Los parámetros cinéticos identificados fueron validados, mediante niveles de confianza, usando la matriz de información de fisher. Se encontró que la región óptima, para alcanzar un mayor rendimiento en la digestión anaerobia, en cuanto a la producción de CH4, superior a 150mLCH4 gSV-1 y tiempos de la fase de latencia menores a 1 día, fue alrededor de 100°C, con tiempos de exposición cercanos a 15 minutos, condición en que se alcanzó una mayor solubilidad y mejorando positivamente la etapa hidrolítica del proceso anaerobio.

Measurement of methane emissions in cattle with infrared gas analyzer and gas chromatography

Gaviria-Uribe, Xiomara | 2020-07

Selección de sustrato adecuado para garantizar la eficiencia en la producción de biogás por medio de biodigestores

Molina Rozzo, Laura Vanessa | 2018

The generation of energy through organic waste is a common practice in rural areas; where you can use these to generate fertilizers and biogas. This document presents the evaluation of a series of organic substrates and evaluates the efficiency of them in questions of time and volume produced. Determine this information will generate focused processes and with a minimum guaranteed efficiency. To obtain this gas, small-scale biodigesters constructed with plastic material were used and the measurements of the products obtained were carried out with the support of basic laboratory techniques. Through experimentation it was determined that the hen manure was the substrate that produced more gas in the shortest time. However, other substrates can also be used in this process obtaining similar results.