Overview of recent progress in exogenous hydrogen supply biogas upgrading and future perspective

• Published in: The Science of the total environment Vol. 848; p. 157824
• Main Authors: Sun, Zhong-Fang, Zhao, Lei, Wu, Kai-Kai, Wang, Zi-Han, Wu, Jie-ting, Chen, Chuan, Yang, Shan-Shan, Wang, Ai-Jie, Ren, Nan-Qi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 20.11.2022
• Subjects: Bioelectrochemical system; Biogas upgrading; Challenge and future perspectives; Exogenous hydrogen supply; Zero valent iron; Biogas upgrading; Challenge and future perspectives; Exogenous hydrogen supply; Bioelectrochemical system; Zero valent iron
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2022.157824

With the rapid development of renewable and sustainable energy, biogas upgrading for producing high-quality biomethane as an alternative to natural gas has attracted worldwide attention. This paper comprehensively reviews the current state of biogas upgrading technologies. The advances in physicochemical, photosynthetic autotrophic, and chemical autotrophic biogas upgrading technologies are briefly described with particular attention to the key challenges. New chemical autotrophic biogas upgrading strategies, such as direct and indirect exogenous hydrogen supply, for overcoming barriers to biogas upgrading and realizing highly efficient bioconversion of carbon dioxide are summarized. For each approach to exogenous hydrogen supply for biogas upgrading, the key findings and technical limitations are summarized and critically analyzed. Finally, future developments are also discussed to provide a reference for the development of biogas upgrading technology that can address the global energy crisis and climate change issues related to the application of biogas. [Display omitted] •The state-of-art biogas upgrading was comprehensively reviewed.•The advances in biogas upgrading with exogenous hydrogen supply were described.•The strategies for overcoming barriers of biogas upgrading with exogenous hydrogen supply were put forward.•The review covers the future development direction of biogas upgrading.