How to choose reverse osmosis membrane for different water quality

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In the selection of reverse osmosis membrane elements, the characteristics of water quality is one of the decisive factors. For raw water with different sources and properties, the types, concentrations and physical and chemical conditions of pollutants are different, which requires the selection of reverse osmosis membranes with targeted treatment performance and stability to meet the purification needs.

For water sources containing high concentrations of salt, such as desalination or industrial wastewater treatment, the selected reverse osmosis membrane must have excellent desalting capacity to ensure that the treated water quality can meet strict purity standards, such as drinking water standards or specific industrial production water standards. Specific to various types of ions, such as calcium, magnesium, sodium and other cations and chloride ions, sulfate ions and other anions, should be selected to effectively intercept the passage of these ions through the reverse osmosis membrane materials, especially for heavy metal ion pollution serious water bodies, the need for specially designed or optimized membrane elements, they often have stronger selection permeability, can efficiently remove specific heavy metal ions, Avoid harm to the environment and human health.

The pH value of the water quality is also critical to the selection of reverse osmosis membranes. Different reverse osmosis membrane materials have different degrees of tolerance to acid-base environments, some membranes may perform best in neutral to slightly alkaline environments, while others maintain stable performance over a wider pH range. Too low or too high pH value may lead to corrosion, oxidation or hydrolysis of the membrane material, which affects the separation efficiency of the membrane, service life and may even lead to the destruction of the membrane structure. Therefore, when selecting the reverse osmosis membrane, it is necessary to confirm that its applicable pH range matches the actual water quality.

In addition, water temperature and operating pressure are also factors that cannot be ignored when selecting reverse osmosis membranes. Although the higher water temperature can improve the speed of water molecules passing through the membrane, if it exceeds the withstand temperature of the membrane material, it will lead to the physical deformation of the membrane and the decline of chemical stability. The operating pressure is too high or too low will directly affect the water permeability and desalination rate of the membrane, so it is necessary to determine the appropriate operating pressure according to the actual application conditions, and ensure that the selected membrane elements can maintain long-term stable separation efficiency under the conditions.


According to the specific technical characteristics of the water quality, including but not limited to ion composition and concentration, pH value, temperature and pressure conditions, scientific and reasonable selection of reverse osmosis membrane is a meticulous and professional task, which requires comprehensive consideration of multiple parameters and practical experience to make decisions to ensure that the selected reverse osmosis membrane can play the best effect in practical applications. To achieve efficient use of water resources and environmental protection objectives.

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