Efficient Mn(II) removal mechanism by Serratia marcescens QZB-1 at high manganese concentration

Xuejiao Huang; Xiaofang Nong; Kang Liang; Pengling Chen; Yi Zhao; Daihua Jiang; Jianhua Xiong

doi:10.3389/fmicb.2023.1150849

Efficient Mn(II) removal mechanism by Serratia marcescens QZB-1 at high manganese concentration

Front Microbiol. 2023 Apr 27:14:1150849. doi: 10.3389/fmicb.2023.1150849. eCollection 2023.

Authors

Xuejiao Huang^{1

2}, Xiaofang Nong¹, Kang Liang¹, Pengling Chen¹, Yi Zhao¹, Daihua Jiang¹, Jianhua Xiong³

Affiliations

¹ State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, Nanning, Guangxi, China.
² Guangxi Bossco Environmental Protection Technology Co., Ltd., Nanning, China.
³ School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi, China.

Abstract

Manganese (Mn(II)) pollution has recently increased and requires efficient remediation. In this study, Serratia marcescens QZB-1, isolated from acidic red soil, exhibited high tolerance against Mn(II) (up to 364 mM). Strain QZB-1 removed a total of 98.4% of 18 mM Mn(II), with an adsorption rate of 71.4% and oxidation rate of 28.6% after incubation for 48 h. The strain synthesized more protein (PN) to absorb Mn(II) when stimulated with Mn(II). The pH value of the cultural medium continuously increased during the Mn(II) removal process. The product crystal composition (mainly MnO₂ and MnCO₃), Mn-O functional group, and element-level fluctuations confirmed Mn oxidation. Overall, strain QZB-1 efficiently removed high concentration of Mn(II) mainly via adsorption and showed great potential for manganese wastewater removal.

Keywords: Serratia marcescens; adsorption; manganese; oxidation; oxidation-related enzyme activity.