FILTER MEMBRANE, FILTER UNIT, FILTER SYSTEM, AND FILTRATION METHOD

摘要

Provided is a filter membrane in which nonwoven fabric formed from synthetic fibers having hydrophilicity is used as a filter membrane that can be used in a treatment system for seawater, river water and the like, has a large filtration flow speed, has sufficient recovery of filtration flow speed with backwashing and chemical washing, and has a long life, specifically, a filter membrane manufactured using a nonwoven fabric formed from fibers given hydrophilicity using a raw material having a hydrophilic functional group on hydrophobic fibers by a method such as applying fibers to which a hydrophilic resin has been applied on the surface of hydrophobic resin fibers or copolymerization of hydrophilic components. Further provided are a filter unit and filtration device using this filter membrane as well as a filtration method for filtering seawater and/or freshwater using this filtration device.