This deals with the Deep Tunnel Sewerage System (DTSS) which has been developed as 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.
Completed in 2008, Phase I of the DTSS comprises a 48km long deep tunnel sewer 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.