About it...
The S$3.4 billion Deep Tunnel Sewerage System (DTSS) is an efficient and cost-efficient solution to meet Singapore’s long-term needs for used water collection, treatment, reclamation and disposal. Conceptualised and managed by PUB, it was conceived as a cost-effective and sustainable solution to meet Singapore’s long-term used water needs.
The mammoth DTSS (Phase 1 & 2) project consists of two large, deep tunnels crisscrossing the island, two centralised water reclamation plants, deep sea outfall pipes and a link sewer network.
Click here to see how DTSS works.
Completed in 2008, Phase I of the DTSS comprises a 48km long deep sewer tunnel running from Kranji to Changi, a centralised water reclamation plant at Changi, two 5km long deep sea outfall pipes and 60km of link sewer.
The heart of the DTSS, the Changi Water Reclamation Plant (Changi WRP) is a state-of-the-art used water plant capable of treating 800,000 cubic metres (176 million gallons) or 320 Olympic size swimming pools of used water a day to international standards. The treated used water is then discharged into the sea through deep sea outfall pipes or channelled to the Changi NEWater factory on the rooftop of the reclamation plant where it is further purified through advanced membrane technologies into NEWater, Singapore’s own brand of reclaimed water.
Crowned ‘Water Project of the Year’ at the Global Water Awards 2009 in Zurich, Switzerland on 28 April 2009, the DTSS was selected as the water project with the most significant contribution to water technology and environmental protection. The annual Global Water Awards is widely recognised as one of the most prestigious symbols of achievement in the global water industry.
What are the benefits?
Ensuring sustainability of NEWater
The Deep Tunnel Sewerage System (DTSS) is an important component of Singapores water management strategy as it allows every drop of used water to be collected, treated and further purified into NEWater, Singapores own brand of reclaimed water.
NEWater is the pillar of Singapores water sustainability. Together with three other sources water from local catchments, imported water and desalinated water they form the Four National Taps, PUBs long-term water supply strategy to ensure a robust and sustainable supply of water for Singapore.
Singapore’s largest NEWater plant to date is built on the rooftop of the Changi Water Reclamation Plant, the first of its kind in the world. Integrating the NEWater plant with the DTSS allows for efficient, large-scale water recycling, thus ensuring the sustainability of NEWater.
Opened in May 2010, this NEWater plant at Changi has a capacity of 50mgd. With this addition, coupled with the expansion of the existing three NEWater plants, NEWater now meets 30% of Singapore’s total water demand.
Compact design and efficient land use
The compact design of the Changi Water Reclamation Plant (Changi WRP) requires only one-third the land area of a conventional plant. There is also no need for a buffer zone, as the plant modules are fully covered.
Phase 1 of the DTSS replaces three of the existing water reclamation plants and accompanying pumping stations, freeing up to 135ha of land for other developments.
Growing Singapores industry capabilities
Over 300 local and international contractors, subcontractors and suppliers have worked on the construction of the DTSS. The experience enabled them to build their track record and pitch for bigger projects in Singapore and overseas.
Major components of DTSS
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