Test device and test method for pure water point flux of external pressure hollow fiber ultrafiltration membrane

Abstract

The invention relates to a test device of a pure water point flux of an external pressure hollow fiber ultrafiltration membrane filament. The test device comprises a constant temperature tank, a waterpump, a pressure reduction valve, a membrane assembly to be tested and a throttling valve which are connected in sequence through pipelines and form a loop, wherein the membrane assembly to be testedcomprises a first water supply pipe, a second water supply pipe, a loose joint and end seal wafers; one end of the first water supply pipe and one end of the second water supply pipe are detachably connected with two ends of the loose joint respectively, and the other ends of the first water supply pipe and the second water supply pipe are sealed through the end seal wafers; external filament quick connection straight tubes are arranged on the end seal wafers; a micro hole for inserting a membrane filament is further formed in the end seal wafer of the water discharging end; the end, locatedinside the membrane assembly to be tested, of the membrane filament is deadly locked by resin; the end, exposed out of the membrane assembly to be tested, of the membrane filament is supported by a flask and produces water; other devices are connected through pipelines to test the pure water point flux of the membrane filament. According to the test device disclosed by the invention, an extremelyshort membrane filament can effectively produce water, so that the pressure drop along the way is extremely small and can be basically ignored, and the flux of the membrane filament can be regarded asthe point flux.

Description

technical field [0001] The invention belongs to the technical field of water treatment filtration membranes, and in particular relates to a testing device and a testing method for the point flux of pure water of an external pressure hollow fiber ultrafiltration membrane. Background technique [0002] The pure water flux value of the membrane filament at a certain position along the way, the length of the filament tends to be infinitely small, is called the pure water point flux of the membrane filament at that point, and the pure water point flux indicates that the membrane filament is not along the edge. The pure water flux when the process pressure drop is affected, and the pure water point flux at different positions along the membrane wire at a certain moment is one of the main operating characteristics of the membrane wire, which can be used to characterize the uniformity of the water production distribution of the membrane wire. . Li Xianhui, Li Jianxin in Hydrodynami...

AI Technical Summary

Problems solved by technology

However, this method can only test the point flux of the submerged membrane filament, and the water produced in the filament flows through the whole filament process, but there is only a change in the flow rate of the produced water at the effective membrane section, and the pressure drop along the ineffective membrane section It has an impact on the test results, which makes the test results no longer the point flux of the standard test pressure when the whole silk produces water

And no matter how the production process of ultrafiltration membrane products changes, there will be uneven distribution of operating characteristics between different membrane filaments and different filament segments

The existence of differences makes the test method described above not suitable for testing the parameter changes along the membrane filament, nor for quantitatively explaining certain laws of membrane filament operation

Images