A process that has been present on the planet for billions of years in the form of rain, today it has been taken to a more advanced level thanks to technology. Recent advances allow us to convert salt water into drinking water in an efficient and sustainable way using solar energy.
A team from MIT (Massachusetts Institute of Technology) has developed a Portable desalination system designed to be taken where it is most neededThis innovation was presented as part of a competition organized by USAID to find solutions to the water scarcity crisis in vulnerable areas of developing countries.
The challenge of converting seawater into drinkable water
To win the grand prize of $140.000, entrants had to prove that their invention not only worked, but was also economical, sustainable and energy efficientThis is vital, as the water crisis affects millions of people around the world, and finding sustainable methods of water purification is essential.
The MIT team has based its proposal on the use of solar panels to charge batteries that power the system. electrodialysisThis process efficiently removes salt from seawater and converts it into water ready for consumption.
How does electrodialysis work?
Professor David L. Chandler of MIT describes it simply: “Electrodialysis works by passing a stream of water between two oppositely charged electrodes.. Electrodes push salt ions out of the water, leaving behind potable water in the middle of the stream. A series of membranes separates the desalinated water from the salt water.
This system is revolutionary because the membranes used do not withstand high pressures, which significantly extends its useful life and reduces maintenance costs. These membranes are expensive, but the low pressure allows them to last much longer than other systems.
Comparison with other desalination technologies
Unlike reverse osmosis, which is the most common method but requires a lot of energy and suffers from rapid wear on its membranes, this system based on electrodialysis has a 90% yield in converting salt water into potable water. This represents a considerable improvement over other methods.
In addition, the system designed by MIT has the advantage of being able to be powered independently thanks to solar panels. This makes it ideal for remote areas and areas without access to electricity. Other systems such as the QuenchSea, manufactured by Hydro Wind Energy, rely primarily on manual power to produce three liters of potable water per hour, but their capacity is limited in high-demand situations.
Another interesting proposal is that of Oneka Technologies, which has developed a system that uses wave energy to generate fresh water without electricity. This system can produce up to 500 cubic meters of water per day, making it a viable option for large communities in need of drinking water.
Applications and scope of portable desalination system
The portable device proposed by MIT is ideal for emergency situations, such as refugee camps or places affected by natural disasters. portability and ease of use They allow drinking water to be brought to areas that have been devastated. In addition, their low ecological impact makes them a sustainable option compared to other, more conventional systems.
In this regard, other technologies such as the use of solar or hydraulic energy to desalinate water have also proven effective. However, the MIT system stands out for its simplicity of use and energy efficiency, making it perfect for non-expert users in vulnerable areas.
Challenges and necessary improvements
One of the main challenges remains the cost of materials used to manufacture desalination systems. Despite the effectiveness of the MIT system, Professor Nidal Hilal of New York University pointed out the need to find more affordable materials to make it viable on a large scale without the cost being prohibitive for the most disadvantaged communities.
As science advances, new research is expected to give the green light to cheaper and more durable materials, which would accelerate the adoption of these systems in areas where the lack of drinking water is critical.
The long-term vision is that these portable desalination devices will not only be used in emergency situations or in private sectors such as tourism, but can become a sustainable solution to the global water crisis.
With the proper use of technology, we can ensure access to drinking water for millions of people around the world, reducing the negative effects of climate change on freshwater sources.