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PUB awards S$449.6m contract for Tuas Water Reclamation Plant to Sinohydro

SINOHYDRO Corporation Limited (Singapore Branch) has clinched a S$449.6 million contract to construct the civil and structural components of domestic liquids modules (DLMs) for the Tuas Water Reclamation Plant.

Singapore's national water agency PUB on Tuesday said that the plant will be equipped to receive both domestic and industrial used water streams from two separate deep tunnels for treatment.

The plant’s two DLMs will house the facilities - including biosorption tanks and membrane bioreactor systems - required to treat domestic used water. The combined treatment capacity will be 650,000 cubic metres (cu m) per day, or about 245 Olympic-sized swimming pools of water.

This treated water will then be further purified to produce NEWater. Any excess will be sent for process needs or discharged into the sea.

Sinohydro’s bid for the DLMs contract was one of 14 that PUB received during an open tender exercise in November last year.

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The contract encompasses civil and structural works, which are slated to start this August. Separate contracts will be called to equip the DLMs with mechanical and electrical components. Construction work is expected to complete by 2025.

PUB said this is the fourth major construction contract it has awarded for the Tuas Water Reclamation Plant. 

The first was awarded to McConnell Dowell to carry out site development works in January 2019. A joint venture between Koh Brothers Building and Civil Engineering Contractor as well as China Harbour (Singapore) Engineering Co was then appointed in July 2019 to build the influent pumping stations. SembCorp Design and Construction won the third contract for the plant’s biosolids treatment facility in March 2020.

Another seven construction tenders worth S$1 billion will be called before the end of 2021. These will include the plant’s industrial liquid modules that will treat industrial used water.

The Tuas Water Reclamation Plant will have an initial treatment capacity of 800,000 cu m per day.

It will be located with the National Environment Agency’s Integrated Waste Management Facility, to collectively form Tuas Nexus, which integrates solid waste and used water treatment processes to improve overall plant performance and optimise land use.

The Tuas Water Reclamation Plant is a key component of PUB’s Deep Tunnel Sewerage System (DTSS) Phase 2 project.

DTSS Phase 2 is a S$6.5 billion infrastructure project to enhance Singapore’s water sustainability by boosting PUB’s capability to reclaim and recycle water in an endless cycle. Once completed in 2025, it will convey used water from western Singapore to the Tuas plant for treatment.

DTSS Phase 1, which covers eastern Singapore and channels used water to the Changi plant, was completed in 2008.

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