FORWARD OSMOSIS MEMBRANE AND MEMBRANE MODULE INCLUDING SAME

Provided are a composite forward osmosis membrane and a membrane module containing same. The composite forward osmosis membrane reduces salt back-diffusion and has high water-permeability, or is made of readily available materials and can be easily manufactured. Even when used at high pressure, separation between a substrate membrane support layer and an active separation layer does not occur in the composite forward osmosis membrane, and thus the composite forward osmosis membrane exhibits stable high performance. This composite forward osmosis membrane is composed of a hollow-fiber porous polymer substrate membrane, wherein an active separation layer is present on the inner surface or outer surface of the substrate membrane, an inner columnar void layer having a predetermined shape is present at a predetermined thickness with respect to the thickness of the substrate membrane from the inner surface toward the center of the substrate membrane, and an outer columnar void layer is present at a predetermined thickness with respect to the thickness of the membrane from the outer surface toward the center of the substrate membrane. The substrate membrane has a water permeability F1 within a predetermined range and a rejection ratio R within a predetermined range, or the substrate membrane support layer contains a polyether sulfone having an OH group. The membrane has a thickness within a predetermined range and a compression strength within a predetermined range.