▎ 摘　　要

NOVELTY - Three-dimensional printing technology for production of sewage treatment filter membranes involves (1) establishing a multi-porous gradient cylinder model on the three-dimensional Max software as needed, arbitrarily designing the size of the filter membrane according to needs, designing the number and size of voids per unit area according to needs, exporting stereolithography format for printing, (2) printing with an extrusion three-dimensional printer, and relating the number of printing layers to the thickness of the filter membrane, and adjusting according to needs. USE - Three-dimensional printing technology for production of sewage treatment filter membranes for sewage treatment (claimed). ADVANTAGE - The three-dimensional printing technology simplifies the preparation process of water filtration materials with controllable size and high yield, and suitable for large-scale production, and is economical and environmentally-friendly. The printed filter membrane has high biological safety, excellent antibacterial performance, efficient oil-water separation performance and excellent dirt filtering function, and can effectively remove pollutants in water. Compared with the existing water filtration method, the filter membrane can greatly improve the efficiency of sewage treatment and improve the effect of sewage filtration. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) three-dimensional printing multifunctional filter membrane for sewage treatment, which is prepared by providing main structure of the filter membrane by sodium alginate, which also provides excellent oil-water separation performance, compounding graphene oxide into sodium alginate to improve the overall mechanical properties and block the impact of a certain force of water, and loading nano-silver particles in the composite material through one-step reduction to provide antibacterial properties and enhance the mechanical properties of the filter membrane at the same time; and (2) preparation of the three-dimensional printing multifunctional filter membrane, which involves using graphene oxide, silver nitrate, sodium alginate and calcium chloride.