Spiral separation membrane element

Abstract

To provide a separation membrane element capable of suppressing projection or telescoping of a supply side flow passage material while reducing flow resistance and fouling of the supply side flow passage when a spiral separation membrane element is operated.SOLUTION: A spiral separation membrane element includes a catchment pipe, a separation membrane, a supply side flow passage material, and a permeation side flow passage material. On a cross section vertical to an axial direction of the catchment pipe of the spiral separation membrane element, with respect to a supply side passage F formed of the supply side passage material and the separation membrane located on a straight line connecting a center of the catchment pipe and an arbitrary outer periphery, heights of the supply side passage on an outer peripheral side and an inner peripheral side are larger than a passage height of a center part between the outer peripheral side and the inner peripheral side.SELECTED DRAWING: Figure 3

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