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Mechanisms in Hexavalent Chromium Removal from Aquatic Environment by the Modified Hydrochar-Loaded Bacterium Priestia megaterium Strain BM.1

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  • Mingyu Wu

    (School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
    Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangzhou 510006, China
    Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangzhou 510006, China)

  • Xiaofang Ouyang

    (School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
    Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangzhou 510006, China
    Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangzhou 510006, China)

  • Yingchao Li

    (Qingdao Key Laboratory of Analytical Technology Development and Offshore Eco-Environment Conservation, Marine Bioresource and Environment Research Center, Ministry of Natural Resources, Qingdao 266061, China)

  • Junxin Zhang

    (School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
    Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangzhou 510006, China
    Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangzhou 510006, China)

  • Jiale Liu

    (School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
    Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangzhou 510006, China
    Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangzhou 510006, China)

  • Hua Yin

    (School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
    Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangzhou 510006, China
    Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangzhou 510006, China)

Abstract

Microbial remediation of Cr(VI)-polluted wastewater offers an effective and sustainable green method. In this study, a novel strain Priestia megaterium strain BM.1 that was capable of reducing Cr(VI) was domesticated. In order to improve its Cr(VI) reduction and adsorption performance, calcium-modified hydrochar (HC-Ca) was utilized to immobilize the strain to obtain the composite material BM.1-Ca. The BM.1-Ca composite achieved a Cr(VI) removal efficiency of 97% at an initial concentration of 60 mg/L within 60 h, representing a 1.96-fold enhancement compared to BM.1 alone and demonstrating significantly improved microbial Cr(VI) removal capacity. The addition of HC-Ca was instrumental in maintaining the stable Cr(VI) removal efficiency of BM.1 in the presence of altered incubation environments and interference from co-existing ions. The reduction in Cr(VI) by BM.1 and the immobilization of Cr(III) on the surface of BM.1-Ca are the main removal mechanisms of Cr(VI). Analysis of microbial oxidative stress and extracellular polymers showed that HC-Ca was able to attenuate the oxidative stress of BM.1 as well as promote the secretion of extracellular polymers. This study reveals the intrinsic mechanism of the novel material BM.1-Ca for remediation of Cr(VI) pollution in water bodies and provides an effective method for bioremediation of Cr(VI).

Suggested Citation

  • Mingyu Wu & Xiaofang Ouyang & Yingchao Li & Junxin Zhang & Jiale Liu & Hua Yin, 2025. "Mechanisms in Hexavalent Chromium Removal from Aquatic Environment by the Modified Hydrochar-Loaded Bacterium Priestia megaterium Strain BM.1," Sustainability, MDPI, vol. 17(11), pages 1-19, June.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:11:p:5172-:d:1671913
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