A review on biogas upgrading in anaerobic digestion systems treating organic solids and wastewaters via biogas recirculation. (January 2022)

• Record Type: Journal Article
• Authors: Yuan, Tian; Zhang, Zhenya; Lei, Zhongfang; Shimizu, Kazuya; Lee, Duu-Jong
• Is Part Of: Bioresource technology. Volume 344:Part B(2022)
• Publication Date: 2022-01
• Subjects: Biogas recirculation -- In-situ biogas upgrading -- Methane enhancement -- Microbial activity -- High buffering capacity; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.126412
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Biogas recirculation as a mixing strategy in AD can contribute to biogas upgrading. Biogas recirculation increases physicochemical dissolution and fixation of CO2 . Promoted growth of hydrogenotrophic methanogen and homoacetogen consumes more CO2 . Biogas recirculation help establish a robust AD suitably treating various organics. Biogas recirculation-based AD sustainably achieves high caloric biogas production. Abstract: 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.