What is the desalination technique?

What is the desalination technique?

Seawater desalination is the removal of salt and impurities from seawater to produce fresh water. Our desalination plants use a reverse osmosis process. Seawater is pumped into the desalination plant from the ocean and passes through pre-treatment filtration to remove most of the large and small particles.

What are the three methods of desalination?

There are three main types of thermal desalination – vapour compression (VC), multi-effect distillation (MED) and multi-stage flash distillation (MSF). IDE develops and provides unique MED & MVC technologies for desalination.

What are the main steps in the desalination process?


  • the salt water is heated or the water is allowed to evaporate.
  • the water vapour is collected rather than being lost.
  • the water vapour is condensed to form pure water/fresh water.
  • the salt is left behind and can be used for other purposes.

What separation techniques are used in desalination?

While reverse osmosis is the key separation technique in seawater desalination plants, it is only one of a series of treatment processes used to separate water from a salty source.

What are 2 main methods of desalination?

Two distillation technologies are used primarily around the world for desalination: thermal distillation and membrane distillation.

Why is desalination bad?

What are the environmental impacts of desalination? Desalination has the potential to increase fossil fuel dependence, increase greenhouse gas emissions, and exacerbate climate change if renewable energy sources are not used for freshwater production. Desalination surface water intakes are a huge threat to marine life.

What is the best method of desalination?

Traditionally, the best way of taking salt out of water has been through vacuum distillation. The salt water is enclosed at a low pressure to reduce its boiling point, making it easier to vaporize to separate the salt from the water.

What is the main disadvantage of desalination methods?

Desalination is not a perfected technology, and desalinated water can be harmful to human health as well. By-products of the chemicals used in desalination can get through into the “pure” water and endanger the people who drink it. Desalinated water can also be acidic to both pipes and digestive systems.

Why is desalination so hard?

The problem is that the desalination of water requires a lot of energy. Salt dissolves very easily in water, forming strong chemical bonds, and those bonds are difficult to break. Energy and the technology to desalinate water are both expensive, and this means that desalinating water can be pretty costly.

Why is desalination not used worldwide?

It is exorbitantly expensive, requires large amounts of energy, it is environmentally damaging plus it is only really viable for coastal communities.

What is the most common method of desalination?

Reverse Osmosis (RO) and Nanofiltration (NF) In relation to thermal processes, Reverse Osmosis (RO) is a relatively new process that was commercialized in the 1970s (Buros, 2000). Currently, RO is the most widely used method for desalination in the United States.

Can you drink ocean water if boiled?

Making seawater potable Desalination is the process of removing salt from seawater, making it drinkable. This is done either by boiling the water and collecting the vapor (thermal) or by pushing it through special filters (membrane).

What are the three main methods of desalination?

Desalination 1 Introduction to desalination. Desalination is the process of removing salt from saline water including seawater, brackish water (less saline that seawater) and hypersaline water (more saline than sea water). 2 Methods of desalination 3 Pre & post-treatment.

How is membrane technology used in desalination plants?

Membrane techniques tend to replace thermal techniques in desalination plants (seawater or brackish water) due to the recent development of membrane technology. As shown in Fig.15.2, in 2013, the worldwide installed desalination capacity was 65% for RO, 21% for MSF, and only 9% for MED [13,14].

How is desalination used to address water shortage?

Desalination technologies may provide one opportunity for generating cost-effective and potentially climate-independent water resources of controlled quality for agriculture applications. As shown in Fig. 1, seawater desalination is the most used solution to address water shortage especially for potable water applications.

Why was distillation desalination used in ancient times?

Distillation desalination is one of mankind’s earliest forms of water treatment, and it is still a popular treatment solution throughout the world today. In ancient times, many civilizations used this process on their ships to convert sea water into drinking water.