Resource-starved Singapore turns sewage into ultra-clean water

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Recycled wastewater can now meet 40% of Singapore's water demand – a figure that is expected to rise to 55% by 2060.

The tiny island nation has little in the way of natural water sources and has long had to rely principally on supplies from neighbouring Malaysia.

While most is used for industrial purposes, some of it is added to drinking water supplies in reservoirs in the city-state of 5.7 million people. "Singapore lacks natural resources and it is limited in space, which is why we are always looking for ways to explore water sources and stretch our water supply," Low Pei Chin, chief engineer of the Public Utilities Board's water reclamation department, told AFP.This is in addition to the city-state's other main approaches to securing water supplies -- importing it, using reservoirs and desalinating seawater.

The site houses a maze of steel pipes, tubes, tanks, filtration systems and other machinery, and can treat up to 900 million litres of wastewater a day -- enough to fill an Olympic-sized swimming pool every 24 hours for a year.In one building, a network of ventilators have been installed to keep the air smelling fresh, although a putrid whiff still hangs in the air.

But it also helps boost drinking water supplies. During the dry season, it is sent to top up several man-made reservoirs and, following further treatment, flows to people's taps.It will add an extra underground tunnel and a major water reclamation plant to serve the western half of the island, which should be completed by 2025.

 

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