Abstract
AbstractDue to continuing mining activities, Cd(II) and As(III) contamination in acid mine drainage (AMD) has become a major environmental challenge. Currently, there is increasing focus on the use of biochar to mitigate AMD pollution. However, the impact of biochar on the process of Fe(II) oxidation by Acidithiobacillus ferrooxidans (A. ferrooxidans) in AMD systems has not been determined. In this study, we investigated the effects of introducing biochar and biochar-leachate on Fe(II) biooxidation by A. ferrooxidans and on the removal of Cd(II) and As(III) from an AMD system. The results showed that the biochar-leachate had a promoting effect on Fe(II) biooxidation by A. ferrooxidans. Conversely, biochar inhibited this process, and the inhibition increased with increasing biochar dose. Under both conditions (c(A. ferrooxidans) = 1.4 × 107 copies mL–1, m(FeSO4·7H2O):m(biochar) = 20:1; c(A. ferrooxidans) = 7.0 × 107 copies mL–1, m(FeSO4·7H2O):m(biochar) = 5:1), the biooxidation capacity of A. ferrooxidans was severely inhibited, with Fe(II) oxidation efficiency reaching a value of only ~ 20% after 84 h. The results confirmed that this inhibition might have occurred because a large fraction of the A. ferrooxidans present in the system adsorbed to the biochar, which weakened bacterial activity. In addition, mineral characterization analysis showed that the introduction of biochar changed the A. ferrooxidans biooxidation products from schwertmannite to jarosite, and the specific surface area increased after the minerals combined with biochar. Coprecipitation experiments of As(III) and Cd(II) showed that Cd(II) was adsorbed by the biochar over the first 12 h of reaction, with a removal efficiency of ~ 26%. As(III) was adsorbed by the generated schwertmannite over 24 h, with a removal efficiency of ~ 100%. These findings have positive implications for the removal of As(III) and Cd(II) from AMD.
Graphical Abstract
Funder
National Natural Science Foundation of China
Shanxi Province “1331 Project” funded project
Natural Science Foundation of Shanxi Province, China
Shanxi Agricultural University school-enterprise cooperation project
Publisher
Springer Science and Business Media LLC
Reference59 articles.
1. Anawar HM, Akter F, Solaiman ZM, Strezov V (2015) Biochar: an emerging panacea for remediation of soil contaminants from mining, industry and sewage wastes. Pedosphere 25:654–665. https://doi.org/10.1016/s1002-0160(15)30046-1
2. Bian R, Joseph S, Shi W, Li L, Taherymoosavi S, Pan G (2019) Biochar DOM for plant promotion but not residual biochar for metal immobilization depended on pyrolysis temperature. Sci Total Environ 662:571–580. https://doi.org/10.1016/j.scitotenv.2019.01.224
3. British Standards Institution BS (2002) Characterisation of waste – Leaching – Compliance test for leaching of granular waste materials and sludges –. Part 2: One stage batch test at a liquid to solid ratio of 10 L/kg for materials with particle size below 4 mm (without or with size reduction). BS EN 12457-2:2002, London, UK.
4. Chen W, Westerhoff P, Leenheer JA, Booksh K (2003) Fluorescence excitation-emission matrix regional integration to quantify spectra for dissolved organic matter. Environ Sci Technol 37:5701–5710. https://doi.org/10.1021/es034354c
5. Chen G, Ye Y, Yao N, Hu N, Zhang J, Huang Y (2021) A critical review of prevention, treatment, reuse, and resource recovery from acid mine drainage. J Clean Prod 329:129666. https://doi.org/10.1016/j.jclepro.2021.129666
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献