A Review of Manganese-Oxidizing Bacteria (MnOB): Applications, Future Concerns, and Challenges

Yanan Cai (), Kun Yang, Chaochao Qiu, Yunze Bi, Bowen Tian and Xuejun Bi
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Yanan Cai: School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
Kun Yang: School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
Chaochao Qiu: School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
Yunze Bi: School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
Bowen Tian: School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
Xuejun Bi: School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China

IJERPH, 2023, vol. 20, issue 2, 1-14

Abstract: Groundwater serving as a drinking water resource usually contains manganese ions (Mn 2+ ) that exceed drinking standards. Based on the Mn biogeochemical cycle at the hydrosphere scale, bioprocesses consisting of aeration, biofiltration, and disinfection are well known as a cost-effective and environmentally friendly ecotechnology for removing Mn 2+ . The design of aeration and biofiltration units, which are critical components, is significantly influenced by coexisting iron and ammonia in groundwater; however, there is no unified standard for optimizing bioprocess operation. In addition to the groundwater purification, it was also found that manganese-oxidizing bacteria (MnOB)-derived biogenic Mn oxides (bioMnO x ), a by-product, have a low crystallinity and a relatively high specific surface area; the MnOB supplied with Mn 2+ can be developed for contaminated water remediation. As a result, according to previous studies, this paper summarized and provided operational suggestions for the removal of Mn 2+ from groundwater. This review also anticipated challenges and future concerns, as well as opportunities for bioMnO x applications. These could improve our understanding of the MnOB group and its practical applications.

Keywords: manganese-oxidizing bacteria; biofilter; groundwater; Mn removal; biogenic Mn oxides (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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