Introduction to common seawater desalination methods

Welcome to contact us WhatsApp
11 Feb 2022

Introduction to common seawater desalination methods

There are more than 20 kinds of seawater desalination technologies in the world, including reverse osmosis, low multiple-effect, multi-stage flash, electrodialysis, pressure steam distillation, dew point evaporation, hydropower cogeneration, thermal film cogeneration and the use of nuclear energy, solar energy, wind energy , tidal energy seawater desalination technology, etc., as well as a number of pretreatment and post-treatment processes such as microfiltration, ultrafiltration, and nanofiltration.

From the perspective of large classification, it is mainly divided into two categories: distillation method (thermal method) and membrane method. Among them, low multiple-effect distillation method, multi-stage flash method and reverse osmosis membrane method are the mainstream technologies in the world. Generally speaking, low multi-effect has the advantages of energy saving, low requirements for seawater pretreatment, and high quality of desalinated water; reverse osmosis membrane method has the advantages of low investment and low energy consumption, but requires high seawater pretreatment; It has the advantages of maturity, reliable operation and large output of the device, but the energy consumption is high.

It is generally believed that the low multiple-effect distillation method and the reverse osmosis membrane method are the future directions. It is estimated that during the "Twelfth Five-Year Plan" period, China's seawater desalination will reach 1.5-2 million tons per day, which is three or four times the existing production capacity, and the investment scale will reach about 20 billion yuan.

Ask Your Questions