The active separation layer of a reverse osmosis membrane that selectively permits water molecules to pass while rejecting dissolved salts and contaminants.
The membrane surface is the critical functional interface in a reverse osmosis (RO) membrane element. It is a thin, dense polyamide active layer formed via interfacial polymerization on a porous polysulfone support. This surface governs the separation performance by applying size exclusion and solution-diffusion mechanisms under high pressure, typically 15-85 bar, allowing water permeation while rejecting over 99% of monovalent ions, organic molecules, and particulates.
诱因 → 失效模式 → 工程缓解
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Fouling results from scaling (mineral deposits like calcium carbonate), organic adsorption (humic acids, proteins), biological growth (biofilms), and colloidal particle accumulation, all reducing flux and increasing pressure requirements.
Performance is validated through standardized tests measuring salt rejection percentage, normalized water flux, pressure drop, and integrity testing using conductivity meters, flow meters, and pressure gauges under controlled conditions.
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