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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Zhu, Feng Xue, Shengguo Liao, Jiaxin Zou, Qi Wu, Hao Hartley, William |
| Description | Author Affiliation: Zhu F ( School of Metallurgy and Environment, Central South University, Changsha 410083, PR China); Liao J ( School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.); Xue S ( School of Metallurgy and Environment, Central South University, Changsha 410083, PR China); Hartley W ( Crop and Environment Sciences Department, Harper Adams University, Newport, Shropshire TF10 8NB, United Kingdom.); Zou Q ( School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.); Wu H ( School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.) |
| Abstract | Bauxite residue often has poor physical conditions which impede plant growth. Native plant encroachment on a bauxite residue disposal area in Central China reveals that natural regeneration may improve its physicochemical properties. Residue samples collected from three different disposal ages were assessed to evaluate residue micromorphology and three-dimensional (3D) aggregate microstructure under natural regeneration. The residue aggregates in different disposal ages were divided in two sections: macro-aggregate (2-1mm) and micro-aggregate (0.25-0.05mm). Residue aggregate micromorphology was determined by scanning electron microscope and energy dispersive X-ray spectroscopy, and the residue aggregate microstructure was determined by synchrotron-based X-ray micro-computed tomography (SR-µCT) and image analysis techniques. Natural regeneration may improve residue aggregate stability and form a stable aggregate structure. Calcium content increased whilst sodium content decreased significantly on the surface of residue aggregates. Under natural soil-forming processes bauxite residue porosity, specific surface area, average length of paths, and average tortuosity of paths all significantly increased. This demonstrated that natural regeneration may stimulate the formation of stable aggregate structure in residues. Further understanding should focus on particle interaction forces and agglomeration mechanisms with the addition of external ameliorations. |
| ISSN | 00489697 |
| Journal | Science of The Total Environment |
| Volume Number | 573 |
| e-ISSN | 18791026 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2016-12-15 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Environmental Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Waste Management and Disposal Pollution Environmental Engineering |
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