In this work the features of a novel stirred bioreactor for the production of H2 from food and zootechnical wastes by biological fermentation are presented. The bioreactor is purposely designed for accomplishing the following main tasks in one single unit: mixing the liquid phase containing the organic wastes, contacting the substrate with the microorganisms attached to an inert packing material for the bio-production of H2, stripping the biogas produced from the liquid phase. A vortex-ingesting configuration in a dual impeller, mechanically-agitated vessel equipped with a central draft tube containing the packing support for the attached-growth process is proposed. The features and the dimensions of the internals have been designed to ensure correct fluid dynamic operation. For simplicity, water and air have been considered as the model fluids and the local hydrodynamic features of the system have been investigated experimentally at different working conditions by Particle Image Velocimetry and Digital Image Processing for determining the velocity fields of the two phases, the bubble size distribution and the central vortex shape; FFT analysis of the vortex position time-traces permitted also to reveal the presence of hydrodynamic macro-instabilities and to determine their frequency. The fluid dynamic suitability and the advantages of this novel bioreactor for the H2 bio-production at large scale are highlighted.
A. Paglianti, G. Ugolini, G. Montante, F. Magelli (2011). GAS-LIQUID HYDRODYNAMICS OF A NOVEL STIRRED REACTOR FOR BIOLOGICAL HYDROGEN PRODUCTION. NAPOLI : Enzo Albano srl.
GAS-LIQUID HYDRODYNAMICS OF A NOVEL STIRRED REACTOR FOR BIOLOGICAL HYDROGEN PRODUCTION
PAGLIANTI, ALESSANDRO;MONTANTE, GIUSEPPINA MARIA ROSA;MAGELLI, FRANCO
2011
Abstract
In this work the features of a novel stirred bioreactor for the production of H2 from food and zootechnical wastes by biological fermentation are presented. The bioreactor is purposely designed for accomplishing the following main tasks in one single unit: mixing the liquid phase containing the organic wastes, contacting the substrate with the microorganisms attached to an inert packing material for the bio-production of H2, stripping the biogas produced from the liquid phase. A vortex-ingesting configuration in a dual impeller, mechanically-agitated vessel equipped with a central draft tube containing the packing support for the attached-growth process is proposed. The features and the dimensions of the internals have been designed to ensure correct fluid dynamic operation. For simplicity, water and air have been considered as the model fluids and the local hydrodynamic features of the system have been investigated experimentally at different working conditions by Particle Image Velocimetry and Digital Image Processing for determining the velocity fields of the two phases, the bubble size distribution and the central vortex shape; FFT analysis of the vortex position time-traces permitted also to reveal the presence of hydrodynamic macro-instabilities and to determine their frequency. The fluid dynamic suitability and the advantages of this novel bioreactor for the H2 bio-production at large scale are highlighted.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
