Anyone help me clear: inorganic ceramic membrane, ultrafiltration membrane, nanofiltration membrane, and reverse osmosis relationship ah?

Ceramic membrane is a kind of inorganic membrane, belongs to the membrane separation technology in the solid membrane materials, mainly with different specifications of alumina, zirconia, titanium oxide and silicon oxide and other inorganic ceramic materials as a support body, by the surface of the coated film, high temperature firing and become.

Artificial permeable membrane used in ultrafiltration process. Generally made of polymer materials such as: cellulose acetate, cellulose acetate, polyethylene, polysulfone and polyamide. Generally pre-made tube, plate type, roll type, capillary type and other types of membrane components, and then assembled multiple components in the application together to increase the filtration area and easy maintenance.

Nano-filtration membrane: pore size above 1nm, generally 1-2nm, is a functional semi-permeable membrane that allows solvent molecules or certain low molecular weight solutes or low valence ions to pass through. It is a special and promising variety of separation membrane, it is named because it can intercept the size of the material is about nanometer, it intercepts the molecular weight of the organic matter is about 150-500 or so, the ability to intercept the soluble salt is between 2-98%, the desalination of monovalent anion salt solution is lower than the high-valent anion salt solution. It is used for removing organic matter and color of surface water, removing hardness of groundwater, partially removing dissolved salts, concentrating fruit juices, and separating useful substances in pharmaceuticals.