1, chemical method.

The main method of chemical desalination is ion exchange method, which is a relatively simple method, that is, using anion-cation exchanger to remove ions from water to reduce the salt content in water.

2. Membrane separation method.

Reverse osmosis and electrodialysis desalination technology are both membrane separation technologies, which are the main methods of desalination of brackish water in China at present.

3. Concentrate and evaporate.

Repeated treatment can concentrate the residual water with high salt content to a small volume and then store it in a suitable place. By natural evaporation, the downstream discharge can be avoided. After water evaporates, salt crystals will be left, which can be transported away when the concentration is above 200g/L and used as chemical raw materials.

4. Dilute emissions.

Dilution discharge is to mix water with low salt content and discharge it after reaching the standard of discharging into water body. Avoid adverse effects on the downstream.

5. Consumption and utilization.

Consumption and utilization are used in places where salt content is not high, which consumes water and finally evaporates into the atmosphere to avoid downstream discharge.