SINGAPORE — Singapore is testing a new ceramic-membrane technology that could significantly reduce the energy needed to prepare seawater for desalination, in a move that could reshape how the city-state produces one of its key sources of water.
The large-scale trial at PUB’s Tuas Desalination Plant is examining whether flat-sheet ceramic membranes developed by Japanese technology company Meiden can replace parts of the conventional multi-stage pre-treatment process used before seawater undergoes reverse osmosis.
If the technology proves reliable, cost-effective and suitable for large-scale operations, PUB said it could eventually be deployed at desalination plants across Singapore.
The 50% figure comes with an important catch
PUB says the new system could save about 50% of the energy used specifically for seawater pre-treatment.
That does not mean Singapore’s entire desalination process will suddenly use half as much energy.
Before seawater reaches the main reverse-osmosis stage, contaminants such as dirt, algae, grease and other particles must be removed to prevent fouling and clogging of downstream membranes.
The existing pre-treatment system uses multiple stages. The ceramic-membrane approach being tested aims to combine the process into a more compact system, potentially reducing both energy consumption and the physical space required.
Singapore currently relies on reverse osmosis to turn seawater into potable water. PUB says desalination currently consumes about 3.5 kWh of energy per cubic metre of water, highlighting why improving efficiency has become a major research priority.
What makes the ceramic membranes different?
Instead of relying solely on conventional polymeric membranes, the demonstration system uses sheets made from porous ceramic material.
Seawater passes across the membrane while channels within the sheets draw water through the porous material. Contaminants including algae, dirt and grease are trapped on the membrane surface, allowing filtered water to continue to the next stage of treatment.
Ceramic membranes are not a brand-new technology. What makes the Singapore project significant is the attempt to demonstrate the technology at a much larger scale and under real seawater conditions.
The trial is also testing how the membranes respond when seawater quality deteriorates — including during algal blooms and oil or grease spills.
A massive test is already under way in Tuas
The demonstration facility began operations in June 2026 and is expected to run for approximately six months.
The system contains around 24,000 ceramic membrane sheets and can produce up to 6 million gallons — nearly 28,000 cubic metres — of filtrate per day for downstream treatment processes.
The project is a collaboration involving PUB, Meiden Singapore and Singapore’s National Research Foundation, with the demonstration plant designed to generate real-world data on reliability, performance and potential energy savings.
The NUS Environmental Research Institute also highlighted the Tuas demonstration plant during Singapore International Water Week 2026, noting that the project will provide operational data on ceramic membranes under actual seawater conditions.
Why Singapore is watching this closely
For Singapore, desalination is more than a technological experiment — it is part of the country’s long-term water-security strategy.
Singapore has four major sources of water known as the Four National Taps: local catchment water, imported water, NEWater and desalinated water.
The government currently operates five desalination plants, with the Jurong Island Desalination Plant becoming the fifth when it officially opened in April 2022.
But desalinated water comes with a major challenge: energy consumption.
The Ministry of Sustainability and the Environment said in January 2026 that desalinated water remains more energy-intensive and costly than NEWater and imported water, even though it is an important weather-resilient source of water.
The ministry also confirmed that PUB is exploring technologies including ultra-permeable and ceramic membranes to reduce the energy intensity of desalination, particularly as Singapore prepares for future demand.
Singapore expects water demand to almost double by 2065, making improvements in efficiency increasingly important.
The technology could also last longer
There is another potential advantage — durability.
According to Meiden, ceramic membranes can have a lifespan of around 20 years, compared with roughly five to seven years for polymeric membranes currently used in water treatment.
However, ceramic membranes cost more upfront. Meiden estimates that the additional initial investment could potentially be recovered in about a decade through operational savings, although the actual economics will depend on performance and operating conditions.
That means the current trial is not simply about whether the membranes can filter seawater.
It is also about whether they can do so reliably, economically and at the scale Singapore needs.
Singapore’s bigger water challenge
The push for more efficient desalination comes as Singapore seeks to strengthen water security while managing energy use and environmental pressures.
NEWater already forms another major part of the country’s water strategy, with treated used water undergoing advanced treatment including microfiltration, reverse osmosis and disinfection. Singapore currently has five NEWater factories.
Desalination, meanwhile, provides a weather-resilient source that does not depend directly on rainfall.
But because it is energy-intensive, improving the technology behind it could have implications far beyond simply producing more water.
Earlier research reported by The Straits Times identified ceramic membranes as one of several technologies being investigated by PUB to make desalination more energy-efficient and resilient, including against severe algal blooms.
The result Singapore is waiting for
For now, the ceramic-membrane system remains a demonstration project, not a nationwide replacement for existing desalination technology.
The next six months will be crucial.
PUB and its partners will need to establish whether the system can maintain stable performance under real seawater conditions, deliver the expected energy savings and justify its higher upfront cost.
If it succeeds, the technology could give Singapore a more compact and potentially more energy-efficient way to prepare seawater for desalination — an important step as the country looks decades ahead at a growing demand for water.
And that is where the bigger question begins: if Singapore can make seawater cheaper and less energy-intensive to treat, could this technology eventually change the economics of desalination itself?
Leave a Reply