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

来源期刊:中南大学学报(英文版)2019年第2期

论文作者:薛生国 廖嘉欣 张一帆 程庆宇 WU Hao吴昊 朱锋

文章页码:331 - 342

Key words:bauxite residue; alkalinity transformation; Penicillium oxalicum; soil formation in bauxite residue; column experiment

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.

Cite this article as: LIAO Jia-xin, ZHANG Yi-fan, CHENG Qing-yu, WU Hao, ZHU Feng, XUE Sheng-guo. Colonization of Penicillium oxalicum enhanced neutralization effects of microbial decomposition of organic matter in bauxite residue [J]. Journal of Central South University, 2019, 26(2): 331–342. DOI: https://doi.org/10.1007/s11771- 019-4005-y.

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