Abstract
Hydrogen became an energy and energy carrier to ensure universal access to affordable, reliable, and modern energy services within the 2030 Sustainable Development Goals targets. It must consider the environmental effects of new generation technologies that increase energy efficiency and provide clean energy. To provide more efficient energy and save the environment, waste-to-hydrogen is a concept emphasizing hydrogen production from waste materials such as biomass waste, municipal solid waste, sewage sludge, packaging and plastics, and recovered fuels. Carbon-rich and nitrogen efficient solid waste such as activated sludge recovered by digestion, fermentation, combustion, gasification, and pyrolysis are well-known sludge-to-energy recovery strategies for producing biogas, fuel gas, biofuel (syngas, bio-diesel, bio-oil). This chapter focuses on the potential use of waste-activated sludge in hydrogen, strategies of waste-activated sludge to hydrogen energy, potential, and prospects.