Method for reproducing membrane element and membrane module

A method for reproducing a membrane element for producing a reproduced membrane element using a part of a used membrane element,

• wherein the used membrane element includes a plurality of membrane leaves each having a permeation-side spacer interposed between separation membranes facing each other and having both-side sealing parts and a peripheral-side sealing part that seal both-side ends and a peripheral-side end in an axial direction, supply-side spacers interposed between the membrane leaves, and a perforated central pipe around which the membrane leaves and the supply-side spacers are wound, and
• the method comprises the steps of:
• cutting off at least the both-side sealing parts of the used membrane element;
• unfolding the membrane leaves after cut-off and cutting off at least the peripheral-side sealing part of the membrane leaves;
• replacing at least the separation membranes of the membrane leaves after unfolding and cut-off with new separation membranes;
• and
• obtaining a reproduced membrane element by forming both-side sealing parts and a peripheral-side sealing part that seal both-side ends and a peripheral-side end in the axial direction of the membrane leaves after replacement.