The basic principle and characteristics of reverse osmosis desalination analysis

the basic principle of reverse osmosis desalination, is to use the choice of ion exchange membrane permeability. Only allow anion by anion exchange membrane, stop by cation, cation exchange membrane allows only by cation, the plus dc field, under the action of water ion for directional migration, make the most of the ion migration water all the way to the other all the way through. Its basis is:, the choice of a semipermeable membrane permeability, which selectively let water through and not allow salt through; , salt water chamber and the penetration of chamber pressure is greater than brine and fresh water chamber pressure, provides water to fresh water from salt water chamber room moving force. The characteristics of reverse osmosis desalination system ( Unattended, stable water quality. RO - EDI desalination system, the effluent is stable, cyclical changes don't appear mixed bed. ( Ph: no, not pollute the environment. Traditional desalination system by using ion exchange desalting, whether using level 1 double bed, Yang or Yin on the bed, bed or two double bed or mixed bed, adopt ion exchange resin, resin with acid and alkali regeneration, and repeated use. In use soda acid resin regeneration process, there are a lot of acid and alkali waste emissions, destroy the ecological balance of the drainage, and the RO - EDI desalination system, in the process of running without alkali. ( Can continuous production, do not need backup device. RO - EDI of RO desalination system for continuous operation equipment, EDI adopts each capacity for ~ th membrane, parallel to expand capacity, again also does not need backup device, solves the original ion exchange equipment need to stop using renewable, has the defects of standby. ( Intake of RO equipment and EDI equipment requirements. Feed water of RO equipment requirements for membrane, the water quality such as short of requirement, the appropriate pretreatment method should be adopted to improve water quality. Besides using coagulation and sedimentation treatment, pretreatment of how media filter, activated carbon filter, precision filter, etc. , sometimes in order to prevent the RO membrane blocking, softening for high hardness water. ( Cover an area of an area small, low operating cost.
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