Agro-food industry seeks cost-effective reduction and recycling technologies for processing wastewaters. Membranes represent a primary separation solution for the agro-food processing industry. Membrane materials are typically organic polymers, although new types of inorganic polymer, ceramic and metallic membranes have been investigated. In particular, metallic membranes, are resistant to high temperatures and corrosive environments, and are expected to have longer lifetimes than the traditional polymeric or ceramic membranes because of their robustness and simple maintenance. In the present work, porous metallic components were produced and investigated in order to assess their applicability as membranes for wastewater filtration. An innovative process based on tape casting technology was adopted:0,5 mm thick rubbery sheets (green tapes) are obtained after tape casting and drying phases. Multi-layer flat or tubular components are realized by stacking several green tape layers .Later, components are sintered in controlled atmosphere and subsequent thermal and mechanical processes give the desired consolidation and porosity properties. The proposed process simplifies and reduces the costs of the manufacture process and allows the production of different types of materials for high performance filters. A microstructural analysis of the produced components showed the suitability of the proposed process for the production of metallic membranes.
An innovative technology for fabrication of metallic membranes for agro-food industry wastewater treatment
ROSSI, Federico;FILIPPONI, MIRKO;NICOLINI, ANDREA;CASTELLANI, BEATRICE;
2015
Abstract
Agro-food industry seeks cost-effective reduction and recycling technologies for processing wastewaters. Membranes represent a primary separation solution for the agro-food processing industry. Membrane materials are typically organic polymers, although new types of inorganic polymer, ceramic and metallic membranes have been investigated. In particular, metallic membranes, are resistant to high temperatures and corrosive environments, and are expected to have longer lifetimes than the traditional polymeric or ceramic membranes because of their robustness and simple maintenance. In the present work, porous metallic components were produced and investigated in order to assess their applicability as membranes for wastewater filtration. An innovative process based on tape casting technology was adopted:0,5 mm thick rubbery sheets (green tapes) are obtained after tape casting and drying phases. Multi-layer flat or tubular components are realized by stacking several green tape layers .Later, components are sintered in controlled atmosphere and subsequent thermal and mechanical processes give the desired consolidation and porosity properties. The proposed process simplifies and reduces the costs of the manufacture process and allows the production of different types of materials for high performance filters. A microstructural analysis of the produced components showed the suitability of the proposed process for the production of metallic membranes.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
