Preparation method of hydrophilic polyethersulfone microfiltration membrane

Abstract

The invention discloses a preparation method of a hydrophilic polyethersulfone microfiltration membrane. The preparation method comprises the following steps: 1, uniformly mixing polyethersulfone, an organic solvent, a non-solvent, a surfactant, an additive and hydrophilic nanoparticles into a membrane casting solution; 2, scraping the casting solution in the step 1 into a liquid membrane with the thickness of 0.2-0.4mm; 3, evaporating the liquid membrane in the step 2 in air for 6-60s at the room temperature; 4, immersing the liquid membrane in the step 3 into a coagulation bath for phase inversion to complete a preparation process. By the preparation method, the hydrophilic polyethersulfone microfiltration membrane is good in hydrophilic effect, high in flux and low in cost.

Description

technical field [0001] The invention relates to a method for manufacturing a microfiltration membrane, in particular to a method for manufacturing a hydrophilic polyethersulfone microfiltration membrane, and the microfiltration membrane is applied to a membrane bioreactor. Background technique [0002] Compared with traditional separation technologies, such as evaporation, extraction, coagulation, ion exchange, etc., membrane separation technology is more and more widely used because it has no phase change, can be operated at room temperature, and has low energy consumption and low operating costs. . [0003] Membrane bioreactor is an efficient biological treatment technology integrating biological treatment and membrane separation. It has the following characteristics: (1) compact structure and small footprint; (2) high treatment efficiency and good effluent quality, fundamentally solving the Sludge bulking problem; (3) High volumetric load and strong impact load resista...

AI Technical Summary

Problems solved by technology

[0005] But the disadvantage of the above method is that, in order to achieve the expected hydrophilic effect, the amount of hydrophilic additives added is usually more. The amount of hydrophilic polyacrylonitrile blended in solution is 25% by weight of polyethersulfone; the presence of large amounts of additives in the membrane (with a corresponding reduction in the amount of PES) will reduce the important properties of PES membranes (such as in acidic and alkaline media High stability, mechanical strength and thermal stability, etc.

The low-temperature plasma treatment and chemical oxidation treatment of the membrane surface require additional equipment, which sometimes causes damage to the membrane. The technology and equipment used for this process still need further research and development

The conditions of polyethersulfone sulfonation reaction are harsh, and it is difficult to carry out stably. The cost of sulfonated polyethersulfone is high, which is 2 to 10 times the cost of polyethersulfone raw materials.

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