Representation method of membrane pore diameter of microporous membrane

Abstract

The invention relates to a representation method of membrane pore diameter of a microporous membrane. The representation method comprises the following steps: (1) artificially preparing spherical SiO2microspheres with normal particle-size distribution and preparing into 10wt% suspension; (2) adopting a microporous membrane to filter the suspension and simulating raw-water experiment; (3) adoptinga laser particle-size analyzer to test distribution of particles in filtrate before and after filtering; (4) carrying out fitting conversion on particle-size distribution data of filtered SiO2; (5) finally carrying out drying treatment on the filtrate, and assisting representation by powder mass change before and after filtering. Different from the conventional bubble-point method, mercury intrusion method and electron-microscope photographing method, the representation method has the advantages of being closer to actual use-performance evaluation, low in cost of used consumables, good to environments and testers, simple and fast in testing speed and vivid and scientific in experimental result, is very suitable for test of large-batch various membranes, and is beneficial to promotion of membrane products.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for characterizing the pore size of a microporous membrane. Background technique [0002] With the industrialization of our country, population urbanization and the rapid improvement of people's living standards, water consumption continues to increase, and the accompanying sewage discharge is also increasing day by day. Once the water resource crisis occurs, it may seriously restrict the sustainable development of our country's society and economy. Actively carrying out various types of sewage treatment and water recycling is one of the technical and economic countermeasures to solve the water resource crisis. Due to the different sources of pollution in the process of sewage treatment, the treatment methods vary widely. Among them, the application of membrane separation technology in water treatment has attracted extensive attention due to its high efficiency and stabi...

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Problems solved by technology

The disadvantage is that the bubble point pressure corresponds to the maximum pore size of the membrane, and errors will occur if the membrane is not completely wetted by the liquid during the actual measurement

Another indirect measurement method is the mercury injection method. This method is to inject mercury into the dry film and measure the volume of mercury under different pressures. The relationship between pressure and pore size satisfies the Laplace equation. The disadvantage of this method is that the equipment The cost is relatively high, and the measured pressure is also relatively high, and due to the high pressure required for the test, it will cause the deformation of the sample and make the result untrue, and the use of liquid mercury in the experiment is relatively not safe and environmentally friendly.

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