Reverse osmosis (RO) is a pressure‑driven membrane separation technology capable of intercepting dissolved salts, heavy metal ions, silica, soluble organics and microorganisms at molecular scale. Unlike microfiltration and ultrafiltration that mainly remove suspended particles and macromolecules, thin‑film composite RO membranes achieve high rejection of low‑molecular dissolved contaminants. It has become the dominant technology for seawater and brackish water desalination, boiler feed water preparation, ultrapure water production for electronics and pharmaceuticals, as well as advanced treatment and reuse of industrial wastewater. This paper introduces the fundamental separation mechanism of reverse osmosis, presents a complete pretreatment plus RO process train, discusses core operating parameters, four major categories of membrane fouling and matched CIP strategies, compares RO with traditional ion exchange and evaporation processes, and summarizes the latest development direction o
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