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Colonization of Penicillium oxalicum enhanced neutralization effects of microbial decomposition of organic matter in bauxite residue

草酸青霉强化有机质的分解实现赤泥碱中和

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Abstract

Bauxite residue is a highly alkaline waste product from refining bauxite ore. Bioremediation driven by microbial activities has been evidently effective in lowering the alkalinity of bauxite residues, which is critical to the initiation of pedogenesis under engineered conditions. The present study investigated the changes of alkalinity and aggregation of bauxite residue at different depth in response to the colonization of Penicillium oxalicum in columns. The results demonstrated that the inoculation of P. oxalicum decreased the residue’s pH to about 7 after 30 d only at the surface layer, which was exposed to aerobic conditions. The formation of aggregates was improved overall in the organic matter treated bauxite residue. However, the EC of bauxite residue increased with time under the incubation condition, probably due to accelerated hydrolysis of sodium-rich minerals. The inoculation of P. oxalicum had no effects on urease activity, but increased cellulose enzyme activity at surface layer only.

摘要

赤泥是氧化铝工业生产过程中产生的强碱性固体废弃物,而生物修复是降低赤泥碱性的有效方 法。针对赤泥高碱性问题,通过土柱实验开展草酸青霉调控赤泥碱性,探究不同深度的赤泥碱性变化。 结果发现应用草酸青霉能显著降低赤泥碱性并形成稳定的团聚体结构;赤泥表层的pH 值在30 天内降 低至7 左右,而电导率则上升。草酸青霉对赤泥中的有机质和脲酶活性无明显影响,但能增加纤维素 酶的活性。

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Acknowledgements

The authors thank the Shanghai Synchrotron Radiation Facility for use of the synchrotron facilities at beamlines BL08U. The authors sincerely acknowledge HUANG Long-bin and WANG Yan-hong to further improve the quality of the manuscript.

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Jia-xin Liao  (廖嘉欣), Yi-fan Zhang  (张一帆), Qing-yu Cheng  (程庆宇), Hao Wu  (吴昊), Feng Zhu  (朱锋) & Sheng-guo Xue  (薛生国)

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  1. Jia-xin Liao  (廖嘉欣)
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Correspondence to Sheng-guo Xue  (薛生国).

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Foundation item: Projects(41877511, 41842020) supported by the National Natural Science Foundation of China; Project(2018zzts421) supported by the Innovative Project of Independent Exploration of Central South University, China

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Liao, Jx., Zhang, Yf., Cheng, Qy. et al. Colonization of Penicillium oxalicum enhanced neutralization effects of microbial decomposition of organic matter in bauxite residue. J. Cent. South Univ. 26, 331–342 (2019). https://doi.org/10.1007/s11771-019-4005-y

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