Nanyang Technological University, Singapore (NTU Singapore) has made a significant breakthrough in the field of environmental sustainability by developing an innovative solar-powered method to transform sewage sludge into green hydrogen for clean energy and single-cell protein for animal feed. This groundbreaking research, published in Nature Water, offers a solution to two crucial global challenges: managing waste and generating sustainable resources. Sewage sludge, a challenging by-product of wastewater treatment, has been traditionally difficult to process and dispose of due to its complex composition and contaminants like heavy metals and pathogens. Common disposal methods such as incineration or landfill are not only time-consuming and energy-inefficient but also contribute to environmental pollution. To combat these issues, NTU researchers created a sophisticated three-step solar-powered process that combines mechanical, chemical, and biological techniques. The proof-of-concept tests demonstrated that this new method outperforms conventional techniques like anaerobic digestion, providing higher resource recovery, complete removal of heavy metal contaminants, reduced environmental impact, and improved economic feasibility. This cutting-edge approach not only contributes to clean energy production through green hydrogen but also offers a sustainable solution for transforming challenging waste into valuable resources, addressing the growing concern of escalating amounts of hard-to-treat sewage sludge.