METHOD FOR PREPARATION OF HYDROPHILIC ASYMMETRIC UTRAFILTRATION AND MICROFILTRATION MEMBRANES CONTAINING SILVERNANO PARTICLES

摘要

A method for manufacturing ultrafiltration and microfiltration membranes which can be hydrophilized simply and economically and are excellent in permeation rate, contamination resistance and microorganism resistance is provided, wherein the membranes can provide an effect of substantially reducing membrane fouling in the case where the membranes are applied to a membrane coupled activated sludge process. A method for manufacturing asymmetric ultrafiltration and microfiltration membranes comprises the steps of: dissolving a polymer into a solvent to prepare a polymer solution; and adding silver nitrate to the polymer solution, and manufacturing a flat membrane from the mixed solution(1) by a phase inversion process. The step of manufacturing the flat membrane by the phase inversion process comprises the steps of: adding silver nitrate into the polymer solution; negatively charging the silver nitrate added polymer solution to cast the negatively charged polymer solution onto a non-woven fabric(3) while ionizing silver nitrate; passing the cast polymer solution through positively charged rolls(2) to impregnate and adhere silver nanoparticles onto a surface of the flat membrane; and impregnating the silver nanoparticle impregnated and adhered cast polymer solution with a non-solvent to form a filtration membrane.