NUS Invention (IMAGE) National University of Singapore Caption This NUS invention operates on low electrical power and does not generate secondary waste, such as sludge, that requires further costly residual waste processing such as incineration. Credit National University of Singapore Usage Restrictions Credit photo accordingly to National University of Singapore License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.