Porous membrane
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsYuki MIKI, Hirokazu FUJIMURA, Hiroki UMEMOTO, Ayu MATSUYAMA
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Abstract
Provided is a porous membrane having high filtration performance and little deterioration of water permeation performance due to membrane surface abrasion when used in a method of clarifying, by membrane filtration, turbid water that is natural water, domestic wastewater, or water resulting from treatment thereof. In the porous membrane, a ratio of internal porosity in a thickness up to 0.12% of membrane thickness from a topmost surface of a surface at a filtration feed side relative to surface porosity of the surface at the filtration feed side is 1.05 or more.
Claims29
A porous membrane in which a ratio of internal porosity in a thickness up to 0.12% of membrane thickness from a topmost surface of a surface at a filtration feed side relative to surface porosity of the surface at the filtration feed side is 1.05 or more.
A porous membrane in which a product of internal porosity in a thickness up to 0.12% of membrane thickness from a topmost surface of a surface at a filtration feed side multiplied by surface porosity of the surface at the filtration feed side is 860%·% or more.
Dependencies are inferred from the claim text.