A state‐of‐the‐art review of biohydrogen producing from sewage sludge. (15th August 2018) - Yao, Zhitong
Summary: The amount of sewage sludge has increased remarkably with the acceleration of urbanization and the promotion of municipal wastewater treatment. Hydrogen is a promising clean fuel, considering the emerging global energy crisis and the growing demand for environmental protection. Producing hydrogen from sewage sludge through anaerobic fermentation is an economical and environmentally sustainable technology. Therefore, in this work, the mechanism of hydrogen production from sludge is critically reviewed and clarified. Current researches including sludge pretreatment and key factors affecting hydrogen production were investigated as well. Some challenges still remain, such as almost all studies feature experiments in batch cultures, and the hydrogen yields were not large. Further studies are needed in this arena, such as inhibiting hydrogen‐consuming bacteria, culturing, and screening high‐efficiency bacteria. The mechanism of hydrogen production from anaerobic co‐digestion, their factors, and techno‐economic evaluation need be further studied as well.