A water flux and retention test device for hollow fiber membranes

Abstract

The invention discloses a water flux and retaining rate testing device of a hollow fiber membrane. The water flux and retaining rate testing device comprises a water storage device, a water replenishing device, a fixing frame, a packaging pipe used for packaging a stock solution and a membrane filament, membrane filament fastening end covers respectively sealed and connected with both ends of the packaging pipe, a metering pump, an outlet valve and a metering pump control panel, wherein both ends of the membrane filament respectively pass though filament passing holes of the two membrane filament fastening end covers and then enter the water storage device; the metering pump is connected with the water port of one membrane filament fastening end cover and communicated with the water replenishing device; the outlet valve is connected with the water port of the other membrane filament fastening end cover and communicated with the water replenishing device; the metering pump control panel is electrically connected with the metering pump. The testing device disclosed by the invention has the characteristics that the packaging pipe is used to package the stock solution and the membrane filament, and the pressure of the stock solution in the packaging pipe is controlled within a stable range by the cooperation among the metering pump control panel, the metering pump and the outlet valve. The testing device has the advantages of being simple in the pressure control system, controlling the pressure in the packaging pipe by liquid flow and thus ensuring the continuous stability in the pressure of the testing device.

Description

technical field [0001] The invention relates to the technical field of filter membrane performance testing, in particular to a testing device for water flux and retention rate of a hollow fiber membrane. Background technique [0002] Hollow fiber membranes are widely used in sewage treatment, brackish water desalination pretreatment, seawater desalination pretreatment, reclaimed water reuse, ultrapure water preparation and other fields. Hollow fiber membranes are pressure-driven microporous membranes. The working principle is that the membrane pores separate substances of different sizes through sieving. The main parameters to measure the performance of hollow fiber membranes are water flux and rejection rate. The performance testing of hollow fiber membranes is usually carried out in the form of single membrane filaments and membrane modules. The test method for a single membrane filament is to place a single membrane filament in a sealed cavity, pass the original liquid i...

AI Technical Summary

Problems solved by technology

[0003] A hollow fiber membrane water flux and bubble pressure test device in the prior art uses compressed air to provide a pressure source for the stock solution. Since the connection of the compressed air source requires multiple pressure control elements to ensure safety and pressure stability, and, As the raw liquid seeps out from the membrane filament, the pressure in the chamber decreases accordingly, which affects the continuous stability of the test device

[0004] In addition, the aperture of the threading hole used to seal the threading bead connecting the membrane thread and the cavity in the device can only allow one size of the film thread to pass through, and it is necessary to replace the threading hole with a different pore size for different sizes of the film thread. Silk beads are inconvenient to replace, which brings inconvenience to the test

[0005] In addition, the existing testing device can only test the performance of a single membrane filament, or can only test the performance of the membrane module. Therefore, different equipment needs to be developed, which increases the test cost

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