The hollow fiber ultrafiltration membrane with inner skin and its application

The hollow fiber ultrafiltration membrane with inner skin was prepared by controlling the external coagulation condition from one or two polymer dopes with dual or triple-orifice spinneret. It was successfully used for the treatment of the wastewater from banknote printing works after characterizing the foulant and finding a suitable cleaning method, for the preparation of polyaluminum chloride (PAC) with high Alb content and the synthesis of nanosized BaSO4 and CaCO3 particles by a membrane reactor.