Scientists at Nanyang Technological University, Singapore (NTU Singapore), have developed a groundbreaking solar-powered process to convert sewage sludge—a by-product of wastewater treatment—into green hydrogen for clean energy and single-cell protein for animal feed. When photovoltaic inverters convert the direct current generated by photovoltaic modules into alternating current, they may contain direct current components and harmonics, three-phase current imbalance, output power uncertainty, etc. Although it's a common phenomenon in grid-tied renewable energy systems, backflow. Now researchers in Australia have come up with a way to make hydrogen efficiently by harnessing the contaminants in wastewater streams (ACS Electrochem.