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<p>To accurately identify the factors affecting the formation of stable aggregates in bauxite residue during the soil-formation process, the comprehensive effects of a combined chemical-biological amelioration strategy including solid wastes and a functional microorganism on aggregate size distribution and its stability in bauxite residue were investigated during a 365-d simulation experiment. The results showed that the combined amelioration effectively reduced the saline-alkalinity of bauxite residue, and markedly changed the contents of aggregate-associated chemical binding agents. Desulfurization gypsum and maize straw-<i>Penicillium oxalicum</i> (<i>P. oxalicum</i>) differentiated the formation of aggregates within different sizes. Maize straw-<i>P. oxalicum</i> stimulated the formation of water-stable macroaggregates with more durable erosion resistance by the wet-sieving and laser dynamic diffraction analysis. The Pearson correlation analysis showed that exchangeable polyvalent metal ions, pyrophosphate extractable Fe oxide, and organic carbon exhibited positive correlations with aggregate stability during the 365-d incubation. The findings in this study may provide data support and engineering practical reference for ecological restoration in the disposal areas.</p>

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Maize straw-Penicillium oxalicum enhanced long-term aggregate stability in bauxite residue ameliorated with desulfurization gypsum

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Feng Zhu,
  • Xing Liu,
  • Jun Jiang,
  • Li Chen,
  • Xiao-lin Zhong,
  • Zi-ying Zhang,
  • Lin Guo,
  • Sheng-guo Xue

摘要

To accurately identify the factors affecting the formation of stable aggregates in bauxite residue during the soil-formation process, the comprehensive effects of a combined chemical-biological amelioration strategy including solid wastes and a functional microorganism on aggregate size distribution and its stability in bauxite residue were investigated during a 365-d simulation experiment. The results showed that the combined amelioration effectively reduced the saline-alkalinity of bauxite residue, and markedly changed the contents of aggregate-associated chemical binding agents. Desulfurization gypsum and maize straw-Penicillium oxalicum (P. oxalicum) differentiated the formation of aggregates within different sizes. Maize straw-P. oxalicum stimulated the formation of water-stable macroaggregates with more durable erosion resistance by the wet-sieving and laser dynamic diffraction analysis. The Pearson correlation analysis showed that exchangeable polyvalent metal ions, pyrophosphate extractable Fe oxide, and organic carbon exhibited positive correlations with aggregate stability during the 365-d incubation. The findings in this study may provide data support and engineering practical reference for ecological restoration in the disposal areas.