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Enhanced Microbial Oxidation–Neutralization Treatment of Acid Mine Drainage Rich in Ferrous Ions (Fe 2+ )

Author

Listed:
  • Wenjie He

    (Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China)

  • Haibo Li

    (Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China)

  • Yin Xu

    (Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China)

  • Feng Zhong

    (Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China)

  • Hao Dong

    (Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China)

  • Min Wang

    (Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China)

Abstract

In this work, a method of enhanced packed-bed microbial oxidation–neutralization has been employed to treat Fe 2+ -rich acid mine drainage. The method features the use of a large number of immobile Acidithiobacillus ferrooxidans ( A. ferrooxidans ) in a bioreactor to promote the oxidation of Fe 2+ to Fe 3+ . Results show that when the influent Fe 2+ concentration is about 900 mg/L and the Fe 2+ oxidation efficiency tends to 100%, the maximum oxidation rate of Fe 2+ in the bio-ceramsite, bio-volcanic stone, and bio-activated carbon packed columns are 301 mg/(L·h), 234 mg/(L·h), and 139 mg/(L·h), respectively. Compared with the direct neutralization method, the enhanced microbial oxidation–neutralization method has several advantages. Firstly, it oxidizes Fe 2+ to Fe 3+ , directly neutralizing the acid mine drainage at low pH and reducing the consumption of neutralizer. Secondly, more economical CaCO 3 can be used as neutralizer. Thirdly, it produces precipitates with high solid content (5.50%), good settling performance (SV 30 = 4%), and small volume, and the capillary suction time (CST) is 8.9 s, which is easy to dehydrate.

Suggested Citation

  • Wenjie He & Haibo Li & Yin Xu & Feng Zhong & Hao Dong & Min Wang, 2022. "Enhanced Microbial Oxidation–Neutralization Treatment of Acid Mine Drainage Rich in Ferrous Ions (Fe 2+ )," IJERPH, MDPI, vol. 19(11), pages 1-13, May.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:11:p:6543-:d:825756
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