Ferrous iron oxidation efficiency and kinetics by indigenous iron-oxidizing bacteria in acid mine drainage

IF 6.7 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Environmental Technology & Innovation Pub Date : 2024-08-05 DOI:10.1016/j.eti.2024.103785

Qiming Mao , Wenqing Qin , Binghua Yan , Lin Luo

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Abstract

Biological Fe(II) oxidation by iron-oxidising bacteria (FeOBs) at low pH is a cost-effective treatment for acid mine drainage (AMD). However, treatments based on this process are limited because of uncertainties regarding the ability and rate of oxidation of Fe(II) from AMD. In the present study, an indigenous FeOBs consortium was enriched in AMD, and its ability to oxidise Fe(II) is described. The bio-oxidation rate of Fe(II) was 39.1 mg/(L·h) under optimal culture conditions [35 ℃, pH 2.0, 500 mg/L Fe(II)]. In addition, the oxidation rate equation of Fe(II) could be fitted to a zero-order kinetic model, indicating that Fe(II) was oxidised at a constant rate. Furthermore, a continuous-flow bioreactor was developed to simulate the Fe(II) oxidation efficiency of indigenous FeOBs for in situ AMD biological treatment. The maximum Fe(II) oxidation rate was 22.8 mg/(L·h) when the influent Fe(II) load was 32.3 mg/(L·h). Acidithiobacillus and Acidiphilium were the dominant species contributing to Fe(II) oxidation in the bioreactor, accounting for 67.7 % and 32.8 %, respectively. The results will help promote the application of FeOBs in AMD treatment.

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酸性矿井排水中本地铁氧化细菌的亚铁氧化效率和动力学特性

铁氧化细菌（FeOBs）在低 pH 值条件下对铁（II）进行生物氧化是一种具有成本效益的酸性矿井排水（AMD）处理方法。然而，由于 AMD 中铁（II）的氧化能力和氧化速度存在不确定性，基于这一过程的处理方法受到限制。本研究在 AMD 中富集了一种本地 FeOBs 复合菌群，并描述了其氧化铁（II）的能力。在最佳培养条件[35 ℃、pH 2.0、500 mg/L Fe(II)]下，Fe(II)的生物氧化率为 39.1 mg/(L-h)。此外，Fe(II) 的氧化速率方程可拟合为零阶动力学模型，表明 Fe(II) 以恒定速率被氧化。此外，还开发了一种连续流生物反应器，用于模拟原位 AMD 生物处理中本地 FeOBs 的铁（II）氧化效率。当进水铁（II）负荷为 32.3 mg/(L-h) 时，最大铁（II）氧化率为 22.8 mg/(L-h)。这些结果将有助于促进铁氧体生物反应器在 AMD 处理中的应用。

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来源期刊

Environmental Technology & Innovation Environmental Science-General Environmental Science

CiteScore

14.00

自引率

4.20%

发文量

435

审稿时长

74 days

期刊介绍： Environmental Technology & Innovation adopts a challenge-oriented approach to solutions by integrating natural sciences to promote a sustainable future. The journal aims to foster the creation and development of innovative products, technologies, and ideas that enhance the environment, with impacts across soil, air, water, and food in rural and urban areas. As a platform for disseminating scientific evidence for environmental protection and sustainable development, the journal emphasizes fundamental science, methodologies, tools, techniques, and policy considerations. It emphasizes the importance of science and technology in environmental benefits, including smarter, cleaner technologies for environmental protection, more efficient resource processing methods, and the evidence supporting their effectiveness.