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Changi Water Reclamation Plant & Sembcorp NEWater Plant

Deep Tunnel Sewerage System and Changi Water Reclamation Plant


Views of CWRP


The Deep Tunnel Sewerage System (DTSS) is Singapore’s answer to its long term used water needs. This super-highway for the collection, treatment and disposal of Singapore’s used water comprises a 48 km tunnel that stretches from Kranji in the northern part of Singapore to Changi in the eastern part, a centralised water reclamation plant, 60 km of link sewers and a 5 km long deep sea outfall. The deep tunnel works entirely by gravity, eliminating the need for pumping stations, thus reducing the risks of used water overflows.

At the heart of the DTSS is the Changi Water Reclamation Plant (CWRP), one of the largest used water treatment facilities in the world. Sited on 32 hectares of land – one-third the size of a conventional plant – the CWRP features a state-of-the-art, compact and covered used water treatment facility that was commissioned in 2008 with an initial treatment capacity of 800,000 cubic metres of used water per day (m3 per day).

Influent pumps
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Sludge Dryers
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CWRP’s capacity was further increased by 120,000 m3 per day in 2016, through the retrofitting of Liquids Modules 1 & 2 with membrane bioreactors (MBR).

Views of MBR retrofitted at the Liquids Modules
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Liquids Modules_2.jpg
To enable CWRP to generate more feedstock that can be utilized to produce additional NEWater, a Wet Weather Facility was employed to treat excess influent flows during wet weather events for discharge to the sea. This facility is the first in PUB, treating 44MGD of flow.

View of Wet Weather Facility

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To continue meeting with used water projections, CWRP is currently undergoing a more extensive expansion, which will see the addition of another 200,000 m3 per day of treatment capacity. The work will include civil and infrastructural expansion works and the installation of MBR equipment. The MBR treatment module will be increased in two phases of 100,000 m3 per day each, in tandem with used water flow projections and to produce more treated used water effluent for NEWater production.

Views of NEWater Facilities in CWRP

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Rooftop NEWater Plant

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Sembcorp NEWater Plant

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Sembcorp NEWater Plant

The Sembcorp NEWater Plant is Singapore’s largest NEWater plant and one of the world’s largest reclamation water plants.

Awarded by PUB in 2008, under a public-private partnership, Sembcorp was contracted to Design-Build-Own-Operate (DBOO) this NEWater plant for 25 years.


“Plant on Plant” – Integrated with Changi Water Reclamation Plant

The Sembcorp NEWater Plant is one of the only large-scale water recycling plants in the world to be housed on top of a water reclamation plant, the PUB-owned Changi Water Reclamation Plant. This innovative plant-on-plant design facilitates large-scale water recycling, particularly in land-scarce Singapore.

PUB’s Changi Water Reclamation plant collects and treats used water from the eastern half of Singapore. The treated used water is then channeled to the Sembcorp NEWater Plant on its rooftop to be further purified into NEWater.

12% of Singapore’s current water needs met by SNWP

With a capacity of 50 million imperial gallons per day, or 228,000 cubic metres, the Sembcorp NEWater Plant produces enough NEWater to meet 12% of Singapore’s total water demand.

A key pillar of Singapore’s water sustainability, and part of the nation’s long-term water supply strategy, the Four National Taps, the facility will enable a robust and sustainable supply of water for all Singaporeans.

Technology capabilities

The Sembcorp NEWater Plant uses the same established and proven NEWater technology pioneered by PUB – microfiltration and reverse osmosis.

This plant’s state-of-the-art microfiltration and reverse osmosis systems are also designed for optimum energy consumption.

International awards and recognition

The Sembcorp NEWater Plant is the winner of the Global Water Awards 2010 Water Reuse Project of the Year, which recognises the water reuse project representing the most significant achievement for the industry internationally.

About Sembcorp Industries

Sembcorp Industries (Sembcorp) is a leading energy and urban solutions provider, driven by its purpose to do good and play its part in building a sustainable future.

Headquartered in Singapore, Sembcorp leverages its sector expertise and global track record to deliver innovative solutions that support the energy transition and sustainable development. By focusing on growing its renewables and integrated urban solutions businesses, it aims to transform its portfolio towards a greener future and be a leading provider of sustainable solutions.

Sembcorp has a balanced energy portfolio of 16.4GW, with 9.5GW of gross renewable energy capacity comprising solar, wind and energy storage globally. The company also has a proven track record of transforming raw land into sustainable urban developments, with a project portfolio spanning over 13,000 hectares across Asia.

Sembcorp is a vital partner in helping to meet the water needs of governments, industries and communities around the world. From specialised industrial wastewater treatment and water reclamation, to desalination and the supply of potable and industrial water, Sembcorp offers innovative solutions to even the most challenging water needs of industries and water-stressed regions.

For more information, please go to www.sembcorp.com.


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Reverse Osmosis

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Ultraviolet Disinfection