Hollow fiber membrane module

A hollow fiber membrane module comprising:

• a pressure vessel;
• a plurality of hollow fiber membrane elements arranged in series inside the pressure vessel;
• and
• a connector that connects the hollow fiber membrane elements to each other, wherein
• the pressure vessel includes:
• a feed port for a feed liquid provided on one end in a longitudinal direction;
• a discharge port for the feed liquid provided on the other end in the longitudinal direction;
• and
• a recovery port for permeated water,
• each of the hollow fiber membrane elements includes:
• a plurality of hollow fiber membranes;
• and
• a double-core tube extending in a longitudinal direction of the plurality of hollow fiber membrane elements,
• the double-core tube includes a perforated distribution tube, and an inner tube disposed inside the perforated distribution tube,
• an outer channel defined by an inner wall of the perforated distribution tube and an outer wall of the inner tube communicates with the feed port and the discharge port,
• an inner channel defined by an inner wall of the inner tube communicates with the recovery port,
• the connector includes a first channel and a second channel that do not communicate with each other, and
• between the hollow fiber membrane elements,
• the outer channels of the hollow fiber membrane elements are connected to each other through the first channel, and
• the inner channels of the hollow fiber membrane elements are connected to each other through the second channel, and hollow portions of the hollow fiber membranes communicate with the inner channels through the second channel.