What is the transmembrane pressure difference of ultrafiltration?

Release Date:

2024-04-22

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1 What is the transmembrane pressure difference

The transmembrane pressure difference of ultrafiltration refers to the pressure difference between the two sides of the filter membrane during the ultrafiltration process, also known as the transmembrane pressure or the membrane pressure difference. Trans-Membrane Pressure Drop, TMP (trans-membrane Pressure Drop), operating parameters of membrane equipment. The transmembrane pressure difference is defined as the pressure required to drive water through the membrane, and is the difference between the inlet pressure and the filtration pressure. The transmembrane pressure difference required for the membrane with smaller pore size is also larger, and the transmembrane pressure difference is also higher when the water temperature is low, the flux is high, and the pollution occurs.

The transmembrane pressure difference of ultrafiltration refers to the ultrafiltration process

In the process of ultrafiltration, there is a pressure difference between the two sides of the filter membrane, which is due to the pressure applied on one side of the filter membrane, while no pressure is applied or less pressure is applied on the other side. This pressure difference is caused by the different resistance of water molecules and solute molecules in the liquid as they pass through the filter membrane. The size of this pressure difference directly affects the filtration effect and efficiency of ultrafiltration. In general, the greater the pressure difference, the stronger the filtration capacity, but at the same time, it will increase energy consumption and wear of the filter membrane. Therefore, when selecting ultrafiltration equipment, it is necessary to select the appropriate transmembrane pressure difference and filtration capacity according to the actual needs and conditions.

What is the transmembrane pressure difference

2 How to Calculate

Transmembrane pressure difference (TMP) = inlet pressure - filtration pressure

3 What is the significance

When the water temperature is low, the flux is high, and the pollution occurs, the membrane pressure difference is also large.

The main reasons for the high pressure difference across the membrane are the pollution of the ultrafiltration membrane, the high water production flow rate and the low water inlet temperature. The ultrafiltration membrane is also mentioned before it is polluted, and chemical cleaning can be carried out. If the flow rate is too high, it needs to be adjusted according to the standards in the technical parameters. The inlet water temperature is too low mainly in winter, and certain equipment can be used to improve the water temperature.

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