Pressure delayed permeation module

A permeation module (100) for pressure delayed permeation. A permeate module (100) includes a pressure vessel (102) having a first draw port (130) and a second draw port (132). A first draw port (130) is disposed in a first end face (104) of the pressure vessel (102) and is in fluid communication with a central structure (e.g., a conduit) (116). A plurality of hollow fiber semipermeable membranes (114) are housed within the fibrous region (115) of the permeable module (100) and disposed about the central structure (116). In a first elongated region (160) of the permeate module (100), a draw stream may flow between the first draw port (130) and the fibrous region (115) via the central structure (116). In a second elongated region (162) of the infiltration module (100), a draw flow is confined within the fibrous region (115) and extends substantially parallel to the central structure (116) by a flow path through which it flows between the draw ports (130, 132). The second region (162) extends along a majority o