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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 2    February 2019

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Colonization of Penicillium oxalicum enhanced neutralizationeffects of microbial decomposition of organic matter in bauxite residue
LIAO Jia-xin(廖嘉欣), ZHANG Yi-fan(张一帆), CHENG Qing-yu(程庆宇), WU Hao(吴昊), ZHU Feng(朱锋), XUE Sheng-guo(薛生国)

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

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.

 

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

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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