Journal
JOURNAL OF CENTRAL SOUTH UNIVERSITY
Volume 26, Issue 2, Pages 331-342Publisher
JOURNAL OF CENTRAL SOUTH UNIV
DOI: 10.1007/s11771-019-4005-y
Keywords
bauxite residue; alkalinity transformation; Penicillium oxalicum; soil formation in bauxite residue; column experiment
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Funding
- National Natural Science Foundation of China [41877511, 41842020]
- Innovative Project of Independent Exploration of Central South University, China [2018zzts421]
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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.
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