News

Reverse osmosis is a membrane separation technology developed in the 1960s. It is a process that relies on reverse osmosis membranes to separate solvents and solutes in solutions under pressure.

Simply put, reverse osmosis is to use sufficient pressure to separate the solvent (usually water) in the solution through a reverse osmosis membrane (a semipermeable membrane). It is opposite to the direction of osmosis, and reverse osmosis with a pressure greater than the osmotic pressure can be used to separate, purify and concentrate the solution.

The main separation object of reverse osmosis membrane is the ion range in the solution.

To understand the principle of reverse osmosis, we must first understand the concept of "osmosis".

Osmosis is a physical phenomenon. If a semipermeable membrane is placed between two salt waters with different concentrations to separate them, we will find that the water on the side with low concentration will penetrate through the membrane into the water with high concentration, while the salt contained in it will not penetrate until the salt concentration on both sides is equalized.

If a pressure is applied to the side of the water with high salt content, the above-mentioned osmosis can also be stopped. The pressure at this time is called osmotic pressure.

If the pressure applied is further increased, the water can penetrate from the side with high salt content to the side with low salt content, and the salt is retained. At this time, reverse osmosis is formed.

In general, the principle of reverse osmosis is to apply a pressure greater than the natural osmotic pressure to water containing salt, so that the osmosis proceeds in the opposite direction, and the water molecules in the raw water are pressed to the other side of the membrane, and pure water is obtained without salt, microorganisms, organic matter and other substances.

Since the pore size of the reverse osmosis membrane is only 0.0001 microns, a bacterium must be reduced by 4000 times, and a filterable virus must be reduced by more than 200 times to pass through, so its effective removal rate is as high as more than 96%.

1. No heating required, no phase change;

2. Low energy consumption;

3. Small equipment size, simple operation, strong adaptability;

4. No pollution to the environment.

1. Desalination of brackish water and seawater;

2. Removal of organic matter, bacteria, colloids and other impurities dissolved in water;

3. Treatment and reuse of wastewater;

5. As a concentration method, it can recover valuable components dissolved in the solution.