Anaerobic microbial manganese oxidation and reduction: A critical review

• Published in: The Science of the total environment 2022-05, Vol.822, p.153513-153513, Article 153513
• Main Authors: Wang, Xuan, Xie, Guo-Jun, Tian, Ning, Dang, Cheng-Cheng, Cai, Chen, Ding, Jie, Liu, Bing-Feng, Xing, De-Feng, Ren, Nan-Qi, Wang, Qilin
• Format: Article
• Language: English
• Subjects: Anaerobic ammonium oxidation; Anaerobic manganese redox; Anaerobiosis; Biodegradation, Environmental; Biological nitrogen removal; Manganese; Manganese cycle; Metals, Heavy; Microbial methane oxidation; Oxidation-Reduction
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2022.153513

Manganese is a vital heavy metal abundant in terrestrial and aquatic environments. Anaerobic manganese redox reactions mediated by microorganisms have been recognized for a long time, which promote elements mobility and bioavailability in the environment. Biological anaerobic redox of manganese serves two reactions, including Mn(II) oxidation and Mn(IV) reduction. This review provides a comprehensive analysis of manganese redox cycles in the environment, closely related to greenhouse gas mitigation, the fate of nutrients, microbial bioremediation, and global biogeochemical cycle, including nitrogen, sulfur, and carbon. The oxidation and reduction of manganese occur cyclically and simultaneously in the environment. Anaerobic reduction of Mn(IV) receives electrons from methane, ammonium and sulfide, while Mn(II) can function as an electron source for manganese-oxidizing microorganisms for autotrophic denitrification and photosynthesis. The anaerobic redox transition between Mn(II) and Mn(IV) promotes a dynamic biogeochemical cycle coupled to microorganisms in water, soil and sediment environments. The discussion of reaction mechanisms, microorganism diversity, environmental influence bioremediation and application identify the research gaps for future investigation, which provides promising opportunities for further development of biotechnological applications to remediate contaminated environments. [Display omitted] •Manganese functions as electron donor and acceptor for microorganisms.•Manganese redox reaction is coupled with various biochemical processes.•The potential mutual effects in C, N, S and Mn biogeochemical cycle were identified.•The manganese redox has potential in bioremediation and engineering applications.