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Neutralization and Improvement of Bauxite Residue by Saline-Alkali Tolerant Bacteria

Author

Listed:
  • Lv Lv

    (National Demonstration Center for Environmental and Planning, College of Geography and Environmental Science, Henan University, Kaifeng 475004, China
    Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, Henan University, Ministry of Education, Kaifeng 475004, China
    Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng 475004, China)

  • Kunyan Qiu

    (Henan Key Laboratory for Monitoring and Remediation in Heavy Metal Polluted Soil, Jiyuan 459000, China)

  • Shiji Ge

    (Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng 475004, China)

  • Zhiqiang Jiao

    (Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng 475004, China)

  • Chenyang Gao

    (Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng 475004, China)

  • Haiguang Fu

    (Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng 475004, China)

  • Rongkui Su

    (School of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China)

  • Zhongkai Liu

    (Zhengzhou Non-Ferrous Metals Research Institute Co., Ltd. of CHALCO, Zhengzhou 450041, China)

  • Yulong Wang

    (National Demonstration Center for Environmental and Planning, College of Geography and Environmental Science, Henan University, Kaifeng 475004, China
    Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, Henan University, Ministry of Education, Kaifeng 475004, China)

  • Yangyang Wang

    (National Demonstration Center for Environmental and Planning, College of Geography and Environmental Science, Henan University, Kaifeng 475004, China
    Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng 475004, China)

Abstract

The high salt-alkalinity of bauxite residue (BR) hinders plant growth and revegetation of bauxite residue disposal areas (BRDA), which cause serious potential environmental and ecological risks. Bioneutralization is a promising method for improving the properties of BR and plant colonization. In the present study, a strong saline-alkali tolerant bacteria (ZH-1) was isolated from aged BR and identified as Bacillus sp. The medium of ZH-1 was optimized by orthogonal tests, and ZH-1 could decrease the medium pH from 11.8 to 6.01 (agitated culture) and 6.48 (static culture) by secretion of citric acid, oxalic acid and tartaric acid. With the inoculation of ZH-1, the pH of BR decreased from 11.6 to 8.76, and the water-soluble salt in BR increased by 68.11%. ZH-1 also changed the aggregate size distribution of BR, the mechanical-stable aggregates and water-stable aggregates increased by 18.76% and 10.83%, respectively. At the same time, the stability of the aggregates obviously increased and the destruction rate decreased from 94.37% to 73.46%. In addition, the microbial biomass carbon increased from 425 to 2794 mg/kg with the inoculation of ZH-1. Bacterial community analysis revealed that Clostridia, Bacilli, Gammaproteobacteria, Betaproteobacteria and Alphaproteobacteria were the main classes in the naturalized BR, and the inoculation of ZH-1 increased the diversity of bacteria in the BR. Overall, ZH-1 has great potential for neutralization and improvement the properties of BR and may be greatly beneficial for the revegetation of BRDA.

Suggested Citation

  • Lv Lv & Kunyan Qiu & Shiji Ge & Zhiqiang Jiao & Chenyang Gao & Haiguang Fu & Rongkui Su & Zhongkai Liu & Yulong Wang & Yangyang Wang, 2022. "Neutralization and Improvement of Bauxite Residue by Saline-Alkali Tolerant Bacteria," IJERPH, MDPI, vol. 19(18), pages 1-13, September.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:18:p:11590-:d:915153
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    References listed on IDEAS

    as
    1. Ling Yang & Qiang Ren & Shiji Ge & Zhiqiang Jiao & Wenhao Zhan & Runxiao Hou & Xinling Ruan & Yanfang Pan & Yangyang Wang, 2022. "Metal(loid)s Spatial Distribution, Accumulation, and Potential Health Risk Assessment in Soil-Wheat Systems near a Pb/Zn Smelter in Henan Province, Central China," IJERPH, MDPI, vol. 19(5), pages 1-12, February.
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