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Walnut Shell Powder Can Limit Acid Mine Drainage Formation by Shaping the Bacterial Community Structure

  • Yuhui Li
  • Mei Yue
  • Jingsong Ye
  • Tao Xu
  • Yehao LiuEmail author
Article
  • 27 Downloads

Abstract

The formation of acid mine drainage (AMD), which results from the oxidation of sulfur minerals by air and water, can be accelerated by acidophilic and chemolithotrophic bacteria such as Acidithiobacillus ferrooxidans. Our previous study revealed that walnut shell powder and its phenolic component inhibit the growth of A. ferrooxidans. However, their inhibitory effect on AMD formation in the environment needs verification. We established a bioleaching system to test whether walnut shell powder and its phenolic component can limit AMD formation. Our results showed that lignin and cellulose isolated from walnut shell decreased metal ion concentrations through absorption, whereas the phenolic component increased pH by downregulating the expression of Fe2+-oxidizing genes and rus operon genes of A. ferrooxidans. Only walnut shell powder showed an excellent ability to curb AMD by binding metal ions and increasing the pH value. On probing deeper into the alteration of the bacterial community structure in the bioleaching system, we found that the bacterial community became more diverse—the amount of A. ferrooxidans decreased and that of some non-acidophilic bacteria increased. The bacterial community in samples treated with walnut shell powder or its phenolic component had low abundance in the pathways of metabolism and energy production, as determined by phylogenetic investigation of communities by reconstruction of unobserved states (PICRUSt). In other words, preponderant microbes, mainly A. ferrooxidans, lacked energy to grow well in the treated samples. Our findings provide a practical applicability of walnut shell powder to reduce leaching from a complex environmental community.

Notes

Acknowledgements

This study was supported by the National Natural Science Foundation of China under Grant (No. 41402303) and the Natural Science Foundation of Anhui Province under Grant (No. 1908085MH287); Subsequent Project for NSFC of Hefei University under Grant (1800070928); the Outstanding Youth Talent Support Plan in Universities of Anhui Province under Grant (gxgnfx2018032); and the Key Projects of Outstanding Youth Talent Support Program in Anhui Provincial University under Grant (gxyqZD2016278).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Yuhui Li
    • 1
  • Mei Yue
    • 1
  • Jingsong Ye
    • 1
  • Tao Xu
    • 1
  • Yehao Liu
    • 2
    Email author
  1. 1.Department of Biological and Environmental EngineeringHefei UniversityHefeiChina
  2. 2.School of Public HealthAnhui Medical UniversityHefeiChina

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