Method for dewatering a spiral membrane element

By creating openings on the membrane of the spiral membrane element and applying centrifugal force, the problem of difficult water removal is solved, achieving efficient water removal and environmentally friendly recycling.

CN115485056BActive Publication Date: 2026-02-27NITTO DENKO CORP
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Patent Information

Application Number
CN202180031653.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2020-12-04
Filing Date
2021-11-11
Publication Date
2026-02-27
Estimated Expiration
2041-11-11

AI Technical Summary

Technical Problem

Existing technologies are unable to effectively remove moisture from spiral membrane elements, especially since the fixation of the FRP outer covering material and ATD makes it difficult for moisture to decompose, resulting in high energy consumption for incineration and environmentally unfriendly landfill disposal.

Method used

By forming an opening on the membrane that connects to the outside through the permeate flow path and applying centrifugal force, the water sealed inside the membrane is discharged through the opening. Different configurations (axis direction parallel to centrifugal force, inclined, or perpendicular) are combined to accelerate water discharge.

Benefits of technology

It enables simple and effective removal of moisture from spiral membrane elements, reduces incineration energy consumption, and promotes sustainable recycling and landfill disposal.

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Abstract

Provided is a method for dehydrating a spiral membrane element, which can effectively remove moisture contained in a used spiral membrane element by a simple method. The method for dehydrating a spiral membrane element according to the present invention is a method for dehydrating a spiral membrane element E that contains moisture, the spiral membrane element E having a winding body and a perforated center tube, the winding body including a plurality of membrane sheets wound on the center tube and having a permeation-side flow path inside. Furthermore, the method for dehydrating a spiral membrane element according to the present invention includes a step of forming an opening (for example, an end face opening formed by a cut surface 16) that communicates the permeation-side flow path with the outside on the plurality of membrane sheets, and a step of applying a centrifugal force to the spiral membrane element on which the opening is formed.
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