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Open AccessArticle

Biological Manganese Removal by Novel Halotolerant Bacteria Isolated from River Water

1
Laboratory of Advanced Materials Chemistry, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam
2
Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
3
Korea Basic Science Institute, Busan Center, Busan 46742, Korea
4
Department of Microbiology, Pusan National University, Busan 46241, Korea
5
Institution of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
*
Author to whom correspondence should be addressed.
Biomolecules 2020, 10(6), 941; https://doi.org/10.3390/biom10060941
Received: 28 May 2020 / Revised: 8 June 2020 / Accepted: 19 June 2020 / Published: 22 June 2020
(This article belongs to the Section Biological Materials)
Manganese-oxidizing bacteria have been widely investigated for bioremediation of Mn-contaminated water sources and for production of biogenic Mn oxides that have extensive applications in environmental remediation. In this study, a total of 5 Mn-resistant bacteria were isolated from river water and investigated for Mn removal. Among them, Ochrobactrum sp. NDMn-6 exhibited the highest Mn removal efficiency (99.1%). The final precipitates produced by this strain were defined as a mixture of Mn2O3, MnO2, and MnCO3. Optimal Mn-removal performance by strain NDMn-6 was obtained at a temperature range of 25–30 °C and the salinity of 0.1–0.5%. More interestingly, strain NDMn-6 could be resistant to salinities of up to 5%, revealing that this strain could be possibly applied for Mn remediation of high salinity regions or industrial saline wastewaters. This study also revealed the potential of self-detoxification mechanisms, wherein river water contaminated with Mn could be cleaned by indigenous bacteria through an appropriate biostimulation scheme. View Full-Text
Keywords: bioprecipitation; aerobic; river; bioremediation; biogenic Mn oxides bioprecipitation; aerobic; river; bioremediation; biogenic Mn oxides
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Nguyen, V.K.; Ha, M.-G.; Kang, H.Y.; Nguyen, D.D. Biological Manganese Removal by Novel Halotolerant Bacteria Isolated from River Water. Biomolecules 2020, 10, 941.

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