I. Hitsov - Academia.edu (original) (raw)
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Egypt-Japan University of Science and Technology (E-JUST)
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Papers by I. Hitsov
Journal of Membrane Science, 2015
Membrane distillation is an emerging thermal membrane technology for the separation of salts and ... more Membrane distillation is an emerging thermal membrane technology for the separation of salts and other non-volatile inclusions from water streams. The process offers a solution for the treatment of concentrated solutions, which are not viable for reverse osmosis. However, only few studies focused on the optimal membrane properties and operational conditions in the high concentration regime. In this paper, membranes with variations in thickness, porosity and structure are experimentally investigated in direct contact membrane distillation (DCMD); in addition, the performance is simulated using the Dusty Gas Model. Operational conditions, including the temperature difference over the membrane, the flow velocity and the feed stream salinity up to saturation were varied. It was confirmed that for pure water, thinner membranes show higher fluxes, while energy efficiency is unaffected by membrane thickness. At higher salinities, an optimal membrane thickness depending on membrane parameters and process conditions exists. The optimal membrane thickness computed in this article ranges from 2 to 739 μm for concentrations of NaCl ranging from 0 up to 24 wt% and variations in bulk temperature difference and flow velocities for four different membrane structures.
Separation and Purification Technology, 2015
Membrane distillation is a technique aimed at separating non-volatile components such as salts fr... more Membrane distillation is a technique aimed at separating non-volatile components such as salts from aqueous feed streams. Mathematical modelling of a complex process like membrane distillation allows building further insight needed for effective analysis and optimization of the system, possibly leading to a breakthrough of the technology. Several models have been proposed in the literature for the heat and mass transport in the water channels of the module as well as inside the porous membranes. This article provides a critical review of these models and discusses the pros and cons of the different models to guide the reader into selecting the most suitable simulation approach. Moreover, research gaps in the literature are listed to indicate what is currently missing from a modelling as well as experimental data collection perspective. Areas for further research are suggested.
Journal of Membrane Science, 2015
Membrane distillation is an emerging thermal membrane technology for the separation of salts and ... more Membrane distillation is an emerging thermal membrane technology for the separation of salts and other non-volatile inclusions from water streams. The process offers a solution for the treatment of concentrated solutions, which are not viable for reverse osmosis. However, only few studies focused on the optimal membrane properties and operational conditions in the high concentration regime. In this paper, membranes with variations in thickness, porosity and structure are experimentally investigated in direct contact membrane distillation (DCMD); in addition, the performance is simulated using the Dusty Gas Model. Operational conditions, including the temperature difference over the membrane, the flow velocity and the feed stream salinity up to saturation were varied. It was confirmed that for pure water, thinner membranes show higher fluxes, while energy efficiency is unaffected by membrane thickness. At higher salinities, an optimal membrane thickness depending on membrane parameters and process conditions exists. The optimal membrane thickness computed in this article ranges from 2 to 739 μm for concentrations of NaCl ranging from 0 up to 24 wt% and variations in bulk temperature difference and flow velocities for four different membrane structures.
Separation and Purification Technology, 2015
Membrane distillation is a technique aimed at separating non-volatile components such as salts fr... more Membrane distillation is a technique aimed at separating non-volatile components such as salts from aqueous feed streams. Mathematical modelling of a complex process like membrane distillation allows building further insight needed for effective analysis and optimization of the system, possibly leading to a breakthrough of the technology. Several models have been proposed in the literature for the heat and mass transport in the water channels of the module as well as inside the porous membranes. This article provides a critical review of these models and discusses the pros and cons of the different models to guide the reader into selecting the most suitable simulation approach. Moreover, research gaps in the literature are listed to indicate what is currently missing from a modelling as well as experimental data collection perspective. Areas for further research are suggested.