Evaluation of Various Items of Reverse Osmosis Process by Polydioxanone Membrane Using Comsol Software

Document Type : Research Article


1 Chemical Engineering, Department of Chemical Engineering, Islamic Azad University, Omidiyeh, Iran

2 گروه مهندسی انرژی، بخش علوم مهندسی و ریاضیات، دانشگاه صنعتی لولئو، سوئد


Reverse Osmosis is one of the membrane processes used to desalinate salt water, remove natural organic compounds, certain contaminants and water softening. One of the most important problems with this type of membrane is the polarization of the concentration and deposition in them, which reduces the product flux and increases the passage of salt through the membrane and also increases the pressure drop. It is important to choose the proper type of membrane to meet the needs associated with the Reverse Osmosis separation process. In this study, Polydioxanone polymer (12%) was used to make the Reverse Osmosis membrane. Also, the phenomenon of mass transfer in the Reverse Osmosis condensation process of the mathematical model based on the separation of water-glucose solution was considered. Considering the surface structure of the membrane, the irreversible thermodynamic model of Spiegler-Kedem was selected to investigate the mass transfer inside the membrane, and the concentration polarization model was assumed to be one-dimensional flow to investigate the mass transfer outside the membrane. The current is assumed to be constant and compressible with constant properties. The results of this study show a decrease in the amount of pure water flux along the membrane due to accumulation of salts and pressure drop and increase in the width of the membrane with increasing pressure and feed concentration. The results obtained from the distribution of glucose concentration in the water show that increasing the applied pressure difference leading to increases the polarization of the concentration on the membrane surface, which should mainly reduce the product flux. But due to the membrane structure, increasing the pressure leads to an increase in the product flux.


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