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La digestion anaerobica de residuos de explotacionespecuarias presenta beneficios tales como, la reduccion de olores y agentes patogenos, la produccion de biogas y biofertilizantes. La produccion de metano esta influenciada, entre otros factores, por el desempeno hidrodinamico del digestor. El objetivo de esta investigacion fue construir y validar un modelo numerico basado en Dinamica de Fluidos Computacional (CFD), a partir de un prototipo de un digestor anaerobico de laguna cubierta. Las simulaciones del modelo en CFD fueron realizadas a partir de las caracteristicas del reactor y las propiedades del fluido de trabajo. Para comprobar la concordancia del modelo, los resultados numericos se relacionaron con datos experimentales generados mediante Velocimetria de Imagenes de Particulas (PIV) en un modelo a escala del digestor original. Con el modelo validado, se simularon cuatro alternativas de diseno. Los resultados mostraron mayor eficiencia del patron de flujo al incluir recirculacion. La reduccion de espacio muerto entre configuraciones propuestas con respecto al original oscilo entre 12,7-19,2%. La configuracion de mejor desempeno hidrodinamico fue con recirculacion de 2/3 de la alimentacion en la entrada original y el otro tercio la distancia de 12 m y con un angulo de 90° respecto a la linea de entrada.ABSTRACTAnaerobic digestion of livestock waste has benefits such as reduction of odours and pathogens, production of biogas and biofertilizers. Methane production is influenced, among other factors, by the hydrodynamic performance of the digester. The objective of this research was to construct and validate a numerical model based on Computational Fluid Dynamics (CFD), from a prototype of a covered lagoon anaerobic digester. CFD model simulations were performed from reactor characteristics and working fluid properties. To check the agreement of the model, the numerical results were related to experimental data generated by Particle Imaging Velocimetry (PIV) in a scale model of the original digester. With the validated model, four design alternatives were simulated. The results showed greater efficiency of the flow pattern by including recirculation. The reduction in dead space between proposed configurations with respect to the original, ranged from 12.7-19.2%. The best hydrodynamic performance configuration was with recirculation of 2/3 of the feed at the original inlet and the other third at 12 m and at an angle of 90° to the input line.

biotecnia

Mejoramiento del desempeño hidrodinámico de un digestor anaeróbico de laguna cubierta mediante CFD//Improving the hydrodynamic performance of a covered lagoon anaerobic digester by CFD