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

Mingyu Wu, Xiaofang Ouyang, Yingchao Li, Junxin Zhang, Jiale Liu and Hua Yin ()
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Mingyu Wu: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
Xiaofang Ouyang: School of Environment and Energy, South China University of Technology, 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
Jiale Liu: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
Hua Yin: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China

Sustainability, 2025, vol. 17, issue 11, 1-19

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).

Keywords: chromium; Priestia megaterium; hydrochar; reduction; extracellular polymer (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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