SPIRAL-WOUND FORWARD OSMOSIS MEMBRANE ELEMENT AND FORWARD OSMOSIS MEMBRANE MODULE

摘要

A spiral-wound forward osmosis membrane element (2) is provided with: a membrane leaf (23) in which an inner flow path extending from a first opening (26A) to a second opening (26B) is formed; and a central tube (31) around which the membrane leaf (23) is wound and which has a supply hole (31A) communicating with the first opening (26A) and a collection hole (31B) communicating with the second opening (26B), and the interior of the central tube (31) is partitioned such that an inflow region (3A) communicating with the supply hole (31A) and an outflow region (3B) communicating with the collection hole (31B) each form a flow path continuously extending in the axial direction of the central tube (31) from one end to the other end of the central tube (3). Liquid supplied to the inflow region (3A) is discharged to the outside without flowing through the inner flow path (26) more than once, and therefore pressure loss in the spiral-wound forward osmosis membrane element (2) is reduced. Thus, a spiral-wound forward osmosis membrane element which achieves a reduction in pressure loss in the flow of a fluid therein can be provided.