If the hollow fiber membrane is the three thousand annoyed silk, the reverse osmosis membrane is that the core has thousands of knots.

Here's a summary of the reasons why the reverse osmosis membrane is blocked:

Concentration polarization
In the reverse osmosis desalination system, the membrane is selectively permeable, so that water molecules continuously permeate the membrane from the high pressure side, and the solute molecules remain in the original solution, resulting in a production between the feed liquid on the membrane surface and the inlet liquid. The difference in concentration, in severe cases, produces a very high concentration gradient, a phenomenon known as concentration polarization.

2. Inorganic salt scaling
Salts with a small solubility product such as CaCO3, CaSO4, BaSO4, SrSO4, CaF2 and SiO2 may precipitate in the reverse osmosis process due to concentration exceeding the solubility product, and deposits may remain on the surface of the membrane or in the water. Scale is formed in the channel.

3. Adsorption pollution

Some well water sources in the brackish water range generally contain low-cost iron ions and manganese ions, which have certain reduction properties. The main cause of membrane fouling caused by such water sources is that iron, aluminum, manganese, etc. produce colloidal particles on the membrane surface. . When O2 enters the influent water containing Fe2+, the high alkalinity water source forms iron carbonate and iron silicate, and the reducing bacteria are mixed in, the iron scale is formed faster and faster, and the colloidal iron caused by the conversion of the iron flocculant is formed.