PUB awards S$449 million domestic liquids modules contract for Tuas Water Reclamation Plant

PUB, Singapore’s National Water Agency, has appointed Sinohydro Corporation Limited (Singapore Branch) to construct the civil and structural components of Domestic Liquids Modules (DLMs) for the Tuas Water Reclamation Plant (WRP). The contract is valued at S$449.6 million. 

Tuas WRP, a key component of PUB’s Deep Tunnel Sewerage System (DTSS) Phase 2 project, 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 various facilities – including biosorption tanks and membrane bioreactor systems – required to treat domestic used water, and will have a combined treatment capacity of 650,000m3 per day, the equivalent of about 245 Olympic-sized swimming pools of water. This treated water will undergo further purification to produce NEWater, while any excess is sent for process needs or discharged into the sea. 

Sinohydro’s bid for Tuas WRP’s DLMs contract was one of 14 that PUB received during an open tender exercise in November 2019. The contract encompasses civil and structural works, which are slated to commence in August 2020. Separate contracts will be called to equip the DLMs with its mechanical and electrical (M & E) components. Construction work is expected to complete by 2025. 

It is the fourth major Tuas WRP construction contract awarded by PUB – the first was awarded to McConnell Dowell to carry out site development works in Jan 2019; Koh Brothers Building & Civil Engineering Contractor (Pte.) Ltd. and China Harbour (Singapore) Engineering Company Pte. Ltd. Joint Venture (JV) was appointed in July 2019 to build the Tuas WRP’s Influent Pumping Stations; SembCorp Design and 

Construction had clinched 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, including the plant’s Industrial Liquid Modules (ILMs) that will treat industrial used water. 

Tuas WRP will have an initial treatment capacity of 800,000m3 per day. The plant will be co-located with the National Environment Agency’s (NEA) Integrated Waste Management Facility (IWMF) to collectively form Tuas Nexus, which integrates solid waste and used water treatment processes to harness various synergies that will improve overall plant performance and optimise land use. 

The DTSS Phase 2 is a S$6.5 billion infrastructure project that will enhance Singapore’s water sustainability by boosting PUB’s capability to reclaim and recycle water in an endless cycle. Upon completion in 2025, DTSS Phase 2 will convey used water from the western part of Singapore to Tuas WRP for treatment. DTSS Phase 1, which covers eastern Singapore and channels used water to Changi WRP, was completed in 2008.