Working principle of water purifier and water purification technology(1)

Update:20 Dec 2019

Water purifier works
 Method / step 1:
 Principle of reverse osmosis
    Definition of permeation: the natural permeation of a solvent (ie water) through a semi-permeable membrane into a solution or from a dilute solution to a more concentrated solution. However, by applying appropriate pressure to the side of the concentrated solution, the permeation can be stopped. The pressure at which the penetration of a dilute solution into a concentrated solution stops is called the osmotic pressure of the solution, and osmotic equilibrium is reached at this time.
    Definition of reverse osmosis: apply a pressure higher than the natural osmotic pressure on one side of the concentrated solution, reverse the direction of natural penetration, and press the solvent (water) in the concentrated solution into the dilute solution on the other side of the semipermeable membrane. The normal osmosis process is reversed, so it is called reverse osmosis.
    The main application areas are: desalination of seawater and brackish water, preparation of pure and ultrapure water, industrial water treatment, drinking water purification, etc.
Method / step 2:
Ultrafiltration principle
    Ultrafiltration is a membrane permeation separation technology that can purify, separate or concentrate solutions. The ultrafiltration process can usually be understood as the sieve process related to the size of the membrane pores. The pressure difference between the two sides of the membrane is used as the driving force, and the ultrafiltration membrane is used as the filter medium. Under certain pressure, when water flows over the surface of the membrane, only water, inorganic salts and small molecular substances are allowed to pass through the membrane to prevent large molecular substances such as suspended solids, colloids, proteins and microorganisms from passing through to achieve the purification of the solution. The purpose of separation and concentration.
    Application of ultrafiltration technology: remove particles, colloids, bacteria, heat sources and various organic substances in water.