Membrane separation is a water resource treatment technology with low energy consumption and high filtration efficiency. Among them, nanofiltration membranes have been widely used in sewage treatment, seawater desalination, food and medicine and other fields due to their advantages of high flux, low operating pressure and good interception performance for divalent ions and small organic molecules.
The flow rate is the amount of filtrate passing through the ptfe hydrophilic filter membraneat a specific temperature and pressure per unit time. strong>The total amount. The flow rate is closely related to the surface properties of the filter membrane. Flow rate and flow rate are two important parameters for filter material and design performance. This performance depends on the following aspects:
(1) Viscosity: Viscosity determines how easy it is for a liquid to flow. The higher the viscosity of the liquid (under corresponding temperature and pressure conditions) the lower the flow rate. The higher the pressure required to achieve the same flow rate.
(2) Pressure difference: The pressure difference between the inlet and outlet of filtration. When the filter is fully loaded, the filtration pressure difference increases.
(3) Porosity: refers to the proportion of the volume of all pores on the ptfe hydrophilic filter membrane to the total volume of the filter membrane. Usually filter membranes have 50-90% pore area, and the flow rate is directly related to the porosity of the membrane.
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