A review on biogas upgrading in anaerobic digestion systems treating organic solids and wastewaters via biogas recirculation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

10 Scopus Citations
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  • Tian Yuan
  • Zhenya Zhang
  • Zhongfang Lei
  • Kazuya Shimizu
  • Duu-Jong Lee

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Original languageEnglish
Article number126412
Journal / PublicationBioresource Technology
Issue numberPart B
Online published24 Nov 2021
Publication statusPublished - Jan 2022


Biogas upgrading is an essential process for efficient and safe utilization of biogas produced from anaerobic digestion (AD), a cost-effective and environmentally friendly technology for bioenergy recovery from organic wastes. Biogas recirculation in AD reactors has been recently reported as a cost-effective and promising method to enhance methane content in biogas. This review aimed to summarize the state-of-the-art of biogas recirculation-based AD systems to better understand the possible mechanisms and main factors relating to in-situ biogas upgrading. It shows that biogas recirculation in the AD reactor can not only enhance methane content via both physicochemical and biological effects, but also help establish a robust AD system with high buffering capacity for highly efficient treatment of various organic wastes. More research works are demanding for a better understanding of the mechanisms and the optimization of the whole AD system, targeting its further development for high-calorie bioenergy production.

Research Area(s)

  • Biogas recirculation, High buffering capacity, In-situ biogas upgrading, Methane enhancement, Microbial activity

Citation Format(s)