Two systems were utilized in the test: a controlled system using the conventional NEWater process combining ultrafiltration and reverse osmosis, and a HiPOx system added between the ultrafiltration and reverse osmosis membranes. Both systems were operated under the same conditions.

The test proved that in the HiPOx-supported system, the reverse osmosis membrane had 66% less blockage than in the controlled system. Moreover, following the reverse osmosis stage, not only was the quality of the product water further improved, the low concentration of pharmaceuticals and personal care products, endocrine-disrupting compounds and other pollutants in residual concentrate are further reduced.

Based on these results, Teijin and the PUB are now considering a field trial using a demonstration, scale equipment.

The HiPOx process combines ozone and hydrogen peroxide chemistry to produce the hydroxyl radical, the most powerful oxidant available for water treatment. Utilizing a multistep injection process, the HiPOx system creates an efficient and carefully controlled oxidative chain reaction to remove harmful substances and pollutants from wastewater. The HiPOx is a registered trademark of APTwater Inc of the United States.

NEWater is Singapore’s own brand of ultra-clean, high-grade reclaimed water. Treated used water is further purified through advanced membrane technologies comprising ultrafiltration, reverse osmosis, as well as ultraviolet disinfection. .

Going forward, Teijin will continue providing PUB with the HiPOx and other advanced technologies, including multistage biological processing, to further enhance used water treatment in Singapore. The company also intends to expand its water-treatment businesses worldwide based on its achievements in Singapore.