Hollow-fiber membrane module unit

A hollow fiber membrane module unit comprising a plurality of hollow fiber membrane elements to which header pipe caps are attached at both end portions, the hollow fiber membrane elements being arranged in parallel to form a row, wherein

• a plurality of the header pipe caps attached to the end portions of the hollow fiber membrane elements on a raw liquid side are fixed to a pedestal, and adjacent header pipe caps attached to the end portions of the hollow fiber membrane elements on the raw liquid side are connected to each other,
• adjacent header pipe caps attached to the end portions of the hollow fiber membrane elements on a permeate side are connected by a side seal connection covering an outer periphery of a contact surface between the adjacent header pipe caps,
• wherein each of the adjacent header pipe caps on the permeate side has an upper part and a lower part, wherein the lower parts of the adjacent header pipe caps are attached to the hollow fiber membrane elements,
• the header pipe caps attached to the end portions on the permeate side at least at both ends of the row are fixed by a support bar,
• wherein the support bar is a separate structural member from the pedestal,
• wherein a longitudinal direction of the support bar is the same as a direction of connection of the header pipe caps,
• wherein the support bar is positioned on the upper part of each header pipe cap and on an opposite side of the hollow fiber membrane elements via the header pipe caps,
• said side seal connection includes a header pipe cap joint and a rubber ring,
• said side seal connection traverses from the contact surface of one header pipe cap to the other contact surface of the adjacent header pipe cap, thereby joining said header pipe caps,
• said rubber ring is in between the header pipe cap and the header pipe cap joint,
• the number of the hollow fiber membrane elements in said row is three or more,
• each of the hollow fiber membrane elements has a side nozzle on a side surface thereof, and
• said side nozzles are paired in two rows,
• wherein the side nozzles adjacent to each other in one of the two rows are shifted in the same orientation,
• the size nozzles adjacent to each other in the second of the two rows are shifted in the same orientation, and
• the side nozzles in one row are arranged in a manner of being shifted from each other in orientation with respect to the side nozzles in the second row.