Saudi Desalination Plant Promises Cheaper Water

In a region dependent on fossil fuel-driven desalination plants, Saudi Arabia hopes to significantly reduce the cost of producing potable water from the salty waters of the Gulf with the Gulf’s first solar-powered desalination plant. If successful, the Saudi example could encourage other oil and sun-rich Gulf states, who rank among the world’s biggest carbon emitters, to reduce their emissions by building similar plants..

The solar-powered plant is being built by the King Abdulaziz City for Science and Technology (KACST), the epicenter of the kingdom’s efforts to break its puritan Islamic mould in a bid to ensure technological and economic development, and IBM, which has made water one of its key areas of focus.

“The culmination of our joint research initiatives has enabled us to radically reduce the cost of water through the development of nanotechnologies that revolutionize traditional desalination methods and renewable energy sources,” Takreem el Tohamy, IBM general manager for the Middle East and North Africa, told The National.

Traditional desalination plants in Saudi Arabia produce a cubic meter of water at a relatively high cost of $.067 to $1.47 compared to Singapore cubic meter and the United States, whose cost can be as little as $0.46 per cubic meter.

Located in Al Khafji, the solar-powered will also reduce cost by employing membranes instead of boiling processes to remove the salt from seawater, IBM and KACST said in a statement.IBM announced last year it had developed a new energy-eficient membrane that has a longer lifespan than previous materials. The Al Khafji plant will generate fresh water by pushing seawater through membranes to remove the salt. The solar component of the plant will produce the electricity needed to drive the machinery.

The project’s scale will overshadow pilot solar desalination plants that have been built in a number of Gulf countries, including a plant that opened in Abu Dhabi’s Al Gharbia region last year with a daily capacity of 68.2 cubic meters. Gulf countries have been trying to build cost-effective solar desalination plants for decades. Abu Dhabi built a plant at Umm al Nar in the 1980s, but it proved to be economically infeasible.

IBM and KACST predict the cost reduction despite the fact that the new plant will use electricity from concentrated solar technology that produces power at a cost many times higher than power stations fired by natural gas or oil. Electricity will come from concentrated photovoltaics, a technology that blends traditional photovoltaic cells with mirrors, lenses and motors to concentrate the rays of sun, thereby more than doubling the efficiency of the panels.

The technology is significantly more expensive than traditional photovoltaic cells alone but takes up less space and operates better in hot climates. The increased cost of using electricity from solar panels at Al Khafji will be offset by the vast efficiency gains of using the new membranes rather than heat to take the salt out of seawater.