The Changi Water Reclamation Plant (CWRP) was commissioned in 2008, and is one of the largest and most advanced water reclamation facilities in the world. The heart of the Deep Tunnel Sewerage System (DTSS) Phase 1, the plant treats about half of the country’s used water and produces treated effluent which is used as feedstock to be further purified into NEWater, Singapore’s brand of ultra-clean, high-grade reclaimed water. NEWater currently meets up to 30% of Singapore’s water demand, and this is set to increase to up to 55% in the longer term.
CWRP has fully-covered treatment modules with an integrated NEWater factory on the rooftop, and a compact design which allows it to occupy only one-third of the land area of conventional water reclamation plants. As part of its compact design, CWRP utilizes advanced technologies, particularly membrane bioreactor (MBR) technology which uses naturally-occurring bacteria and a microfiltration/ultrafiltration membrane process in an integrated system to break down and treat used water. MBR is a more efficient method as it optimises the used water treatment process, enabling used water to be treated using less steps and less space compared to conventional systems, and produces a higher quality treated effluent. Through retrofitting with MBR technology, CWRP has increased its treatment capacity from an initial 800,000 to 920,000 cubic metres of used water per day (m3 per day) within the same footprint. To continue meeting used water projection, CWRP will undergo more extensive expansion, which will see the addition of another 100,000 m3 per day of treatment capacity by 2020.