Effect of amendments on the leaching behavior of alkaline anions and metal ions in bauxite residue
| Autor: | Jingju Zhou, Feng Zhu, Tao Tian, Yuzhen Ye, William Hartley, Ying Guo, Shengguo Xue |
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| Rok vydání: | 2019 |
| Předmět: |
Anions
Environmental Engineering Metal ions in aqueous solution Inorganic chemistry 0211 other engineering and technologies Amendment chemistry.chemical_element 02 engineering and technology 010501 environmental sciences engineering.material 01 natural sciences Aluminum Oxide Soil Pollutants Environmental Chemistry Organic matter Leachate Arsenic 0105 earth and related environmental sciences General Environmental Science chemistry.chemical_classification 021110 strategic defence & security studies General Medicine Alkali metal Bauxite Models Chemical chemistry Metals engineering Leaching (metallurgy) |
| Zdroj: | Journal of Environmental Sciences. 85:74-81 |
| ISSN: | 1001-0742 |
| Popis: | A column leaching experiment was used to investigate the efficacy of amendments on their ability to remove alkaline anions and metal ions from bauxite residue leachates. Treatments included, simulated acid rain (AR), phosphogypsum + vermicompost (PVC), phosphogypsum + vermicompost + simulated acid rain (PVA), and biosolids + microorganisms (BSM) together with controls (CK). Results indicated that amendment could effectively reduce the leachate pH and EC values, neutralize OH−, CO32−, HCO3−, and water soluble alkali, and suppress arsenic (As) content. Correlation analysis revealed significant linear correlations with pH and concentrations of OH−, CO32−, HCO3−, water-soluble alkali, and metal ions. BSM treatment showed optimum results with neutralizing anions (OH−, CO32−, and HCO3−), water soluble alkali, and removal of metal ions (Al, As, B, Mo, V, and Na), which was attributed to neutralization from the generation of small molecular organic acids and organic matter during microbial metabolism. BSM treatment reduced alkaline anions and metal ions based on neutralization reactions in bauxite residue leachate, which reduced the potential pollution effects from leachates on the soil surrounding bauxite residue disposal areas. |
| Databáze: | OpenAIRE |
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