Testing Methods For Hollow Fiber Membrane Modules
Dec 06, 2025| Testing methods for hollow fiber membrane modules focus on their core physicochemical properties and separation/permeability performance. Core performance parameters include porosity, pore size distribution, tensile strength, pressure resistance, flux decay rate, rejection rate, hydrophilicity, chemical resistance, and thermal stability. Flux and rejection rate are crucial separation performance indicators.
When testing flux and rejection rate, methods can be categorized into internal pressure and external pressure methods based on the feed liquid flow direction, and into cross-flow and dead-end methods based on the flow pattern. Therefore, common testing modes include internal pressure cross-flow method, external pressure cross-flow method, internal pressure dead-end method, and external pressure dead-end method. The formula for calculating membrane flux (J) is J = V / (S * t), where V is the permeate volume, S is the effective membrane area, and t is time. The formula for calculating rejection rate (R) is R = (1 - C1/C0) * 100%, where C0 is the feed concentration and C1 is the permeate concentration.
These testing methods comply with multiple national standards, such as GB/T 40258-2021 "Evaluation Method for Corrosion Resistance of Hollow Fiber Membranes to Chemical Cleaning Agents", GB/T 38902-2020 "Determination of Cross-sectional Dimensions of Hollow Fiber Membranes - Image Analysis Method", GB/T 38511-2020 "Evaluation Method for Service Life of Hollow Fiber Membranes", GB/T 42281-2022 "Hollow Fiber Membrane Modules for Membrane Aerated Biofilm Reactors (MABR)", HG/T 5111-2016 and the new 2025 edition of "Column-type Hollow Fiber Membrane Modules", etc.