It marks Sri Lanka’s first-ever large-scale SWRO desalination plant

By Sanath Nanayakkare

The Asian Development Bank (ADB)-funded sea water reverse osmosis (SWRO) desalination plant in Thalaiyadi has delivered a crucial operational boost to the Jaffna Teaching Hospital, securing a reliable supply of purified, low-calcium water for critical medical care and specialized equipment.

Speaking during a site briefing with ADB officials headed by Country Director Shannon Cowlin, National Water Supply and Drainage Board engineers, and media representatives, Hospital Director Dr. T. Sathiyamoorthy confirmed that a dedicated supply line from the plant was successfully connected earlier this year following three years of planning and requests.

With a 175-year legacy of excellence, this 1,550-bed facility serves as the premier healthcare institution in the Northern Province. Currently providing specialized services—including neurosurgery, open-heart surgery, kidney transplants, and bone marrow transplants—the hospital is positioning itself for elevation to National Hospital status under Ministry of Health guidelines.

Operating across a sprawling 13.5-acre compound, the institution functions much like a self-contained township, managing a massive daily footfall that underscores its role as a vital regional lifeline. The hospital accommodates over 1,500 in-patients on any given day, while its outpatient services face a relentless stream of visitors. Daily arrivals typically include 900 to 1,000 OPD patients, accompanied by up to 2,800 clinic visitors distributed across more than 30 specialized medical and surgical units.

When factoring in the wider operational ecosystem, the total daily population within the compound swells to approximately 10,000 people. This high-volume environment is sustained by a dedicated workforce of 2,400 healthcare professionals, alongside a daily influx of over 3,000 visiting relatives who pass through the facility to support recovering patients.

The Thalaiyadi seawater desalination plant

For decades, the hospital’s reliance on local groundwater presented severe operational bottlenecks. Jaffna’s limestone-heavy geology yields water with high calcium concentrations, causing severe mineral build-up that damaged millions of rupees worth of high-value equipment ranging from large-scale sterilizers to delicate endoscopic instruments.

The introduction of low-calcium desalinated water has immediately safeguarded key operational areas. The initial phase of the connection delivers purified water directly to high-priority sections, including operating theaters, intensive care units (ICUs), and main entrance public drinking facilities.

While the hospital’s total assessed daily demand stands at 1,500 cubic meters, desalinated water currently covers approximately 30% of total usage. The remaining 70% continues to depend on legacy systems due to internal piping networks that are nearly 60 years old. To resolve this, hospital management has floated tenders to overhaul internal distribution lines, enabling pure desalinated water to reach all wards.

Jaffna Teaching Hospital Director Dr. T. Sathiyamoorthy and ADB Country Director Shannon Cowlin during a meeting at the hospital premises

Engineers confirmed that the SWRO plant operates with a capacity of 24,000 cubic meters per day, guaranteeing ample volume for full hospital coverage. Furthermore, the ADB is structuring a new municipal wastewater treatment project for Jaffna, which will integrate the hospital and replace its aging internal waste treatment system.

Dr. T. Sathiyamoorthy stressed that clean piped water is vital to public health in Jaffna, where groundwater remains vulnerable to agricultural fertilizer runoff, commercial effluents, and historical pollution concerns such as the Chunnakam oil contamination incident. He noted that encouraging piped water consumption also reduces dependence on single-use bottled water, which risks microplastic degradation when exposed to the region’s intense heat.

The Thalaiyadi seawater desalination plant represents a major financial investment coupled with rigorous environmental management to protect the surrounding coastal ecosystem. Financially, the project carries a total capital cost of USD 55 million, anchored by a primary contract valued at LKR 14,559 million—structured across multiple currencies including USD 49 million, EUR 15 million, and INR 314 million, alongside local allocations.

Awarded to M/s Suez International under a comprehensive Design, Build, and 7-Year Operation framework, the project involves an operational expenditure of USD 0.55 per cubic meter, with management scheduled to transfer to the National Water Supply and Drainage Board (NWSDB) following the completion of the operational term in October 2031.

Simultaneously, extensive ecological safeguards have been integrated into the facility’s design to mitigate marine disruption. The offshore intake system is positioned away from sensitive habitats and utilizes low-velocity grilles to prevent fish entrainment, safeguarding the interests of the local fishing community. Furthermore, waste discharge is strictly regulated under Central Environmental Authority (CEA) and Marine Environment Protection Authority (MEPA) guidelines. Brine concentrate is sent through an offshore outfall equipped with specialized diffusers located more than 500 meters from the shore, ensuring rapid dispersion and limiting salinity impact to a tightly controlled 50-meter mixing zone.