1, tube device. With tubular membrane and supported by porous tube, similar to the shell and tube heat exchanger equipment, divided into internal and external pressure type, each supported by porous tube on the outside or inside of the membrane. The membrane surface of the internal pressure type is easy to flush, suitable for microfiltration and ultrafiltration.
2, plate and frame device. In the same size between the sheet membrane group, the spacer is inserted between each other, forming two kinds of liquid flow flow channel. Because the membrane group can be placed in a uniform electric field, this structure is suitable for electrodialyzer. Plate and frame device can also be applied to the membrane on both sides of the fluid static pressure difference is small over the filtration and dialysis.
3, hollow fiber type device. Hollow fiber does not need to support and can withstand high differential pressure, in a variety of membrane separation equipment, it is the unit volume of equipment to accommodate a large membrane area. Hollow fiber with a similar composition to the shell and tube heat exchanger equipment. Hollow fiber diameter of about 0, 1 ~ 1mm, and column up to millions of roots, fiber ends sealed with epoxy resin, constituting a tube plate, encapsulated in a pressure vessel. Hollow fiber type is suitable for reverse osmosis and gas permeation separation.