Method for operating flat membrane type membrane element, element unit, flat membrane type membrane module and flat membrane type membrane module

摘要

The present invention relates to a flat membrane type membrane element in which permeate side faces of a membrane are arranged so as to face each other and channel materials are provided inside and pairs of membrane membranes are formed, wherein a bending elastic modulus in at least one direction is 100 to 1000 MPa, a maximum bending stress is 1 to 15 MPa Of the area of the high-elasticity region satisfying the following formula (1) is 10% or more of the area of the filtration region of the separation membrane pair.