SPIRAL WOUND MEMBRANE ELEMENT AND METHOD FOR CLEANING SPIRAL WOUND MEMBRANE SHEET

摘要

A spiral wound membrane element and a method for cleaning a spiral wound membrane sheet are provided. The spiral wound membrane element comprising a perforated central tube; one or more membrane sleeves, each sleeve comprising two membrane sheets enclosed at two edges around a feed spacer sheet and wrapped around the central tube; a permeate carrier sheet attached to the central tube at a first edge opposite a second edge; and a seal on third and fourth edges of the permeate carrier sheet. The method comprises introducing two solution with different solute concentration to two sides of the spiral wound membrane sheet; establishing a concentration gradient between the first and second sides; communicating a first solvent from the first side to the second side to remove a foulant located on the second side of the membrane sheet and collecting a waste stream that contains the foulant.

主权项

1. A spiral wound membrane element comprising:
a perforated central tube with a flow restriction at one end; one or more membrane sleeves, each sleeve comprising two membrane sheets enclosed at two edges around a feed spacer sheet and wrapped around the central tube; a permeate carrier sheet in a one to one ratio with the membrane sleeves and attached to the central tube at a first edge opposite a second edge; and a seal on a third edge and a fourth edge of the permeate carrier sheet, extending from the first edge to the second edge.