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| Application of immobilization technology to promote microbial reduction of Cr（Ⅵ） |
| Received:December 26, 2023 |
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| KeyWord:Cr（Ⅵ）;Stenotrophomonas sp.;sweet potato starch capsules;embedding microbial agents |
| Author Name | Affiliation | E-mail | | KANG Qianlin | School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China | | | GENG Yuhong | School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China | | | ZHANG Yazhen | School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China | | | ZHANG Hengxing | School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China | | | ZHANG Qingming | School of Applied Technology, Southwest University of Science and Technology, Mianyang 621010, China | 378932547@qq.com | | HAN Ying | School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China | 595749991@qq.com | | ZHOU Lei | Key Discipline Laboratory of Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, China | |
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| Abstract: |
| The microbial remediation of Cr（Ⅵ）-contaminated sites is hindered by poor environmental adaptability and low remediation efficiency. In this study, the effectiveness of microbe-embedded sweet potato starch at reducing microbial Cr（Ⅵ）was assessed, and the efficiency and safety of embedded microbial remediation of Cr（Ⅵ）-contaminated soil was evaluated, using tall fescue as the experimental plant. The results indicate that, compared with untreated Cr（Ⅵ）- contaminated soil（CK）at low concentrations（30 mg·kg-1）and high concentrations（100 mg · kg-1）, the Cr（Ⅵ）removal rates of embedded bacterial treatment（MIF）increased over time, as evidenced by measurements made on the 10th（early）, 20th（middle）, and 30th（late）day of the experiment. In contrast, the Cr（Ⅵ）removal rates in the free bacterial treatment（F）decreased with time. Compared with the F treatment, the MIF treatment resulted in Cr（Ⅵ）removal rate increased by 43.80% and 58.80%, respectively. The soil urease, sucrase, and catalase activities of MIF increased by 1.50, 1.57 times, and 1.79 times, respectively, at low Cr concentrations, and 2.53, 1.89 times, and 2.04 times at high concentrations. The proportion of exchangeable Cr in MIF-treated soils showed significant differences：at the end of the Cr stress period, the proportion of exchangeable Cr decreased by 23.43% and 20.37%, in low- and high-Cr soils, respectively, compared with the F soils, and the proportion of residual Cr increased by 22.31% and 6.09%, respectively. Compared with MIF, F treatment significantly increased the Cr content（9.12, 1.76 times and 1.97, 2.17 times）, malondialdehyde content（1.38, 1.32 times）, reactive oxygen species content（1.48, 1.30 times）, and antioxidant enzyme activity（peroxidase 1.55, 1.45 times; peroxidase 1.37, 1.59 times）in the aboveground and underground parts of tall fescue. The results showed that, compared with free bacteria, embedded bacteria showed better Cr（Ⅵ）remediation efficiency, providing a new technical approach for improving the efficiency of microbial remediation of Cr（Ⅵ）- contaminated soil. |
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