NDLI: Vermicompost and Gypsum Amendments Improve Aggregate Formation in Bauxite Residue

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Vermicompost and Gypsum Amendments Improve Aggregate Formation in Bauxite Residue

Content Provider	Semantic Scholar
Author	Zhu, Feng Jing-Tao, Hou Xue, Sheng-Guo Chuan, Wu Qiong-Li, Wang Hartley, William
Copyright Year	2017
Abstract	Improving aggregate formation and stability of bauxite residue is essential for the development of a soil on the residue. Effects of gypsum and vermicompost on related chemical and physical conditions of bauxite residue were studied in a laboratory incubation experiment. Addition of gypsum at 2% and 4% w/w reduced pH and exchangeable sodium percentage, whilst increasing exchangeable calcium content. Addition of vermicompost reduced bulk density, whilst significantly increasing porosity and total organic carbon. Vermicompost had a positive effect on the formation and stabilization of water-stable aggregates in the residue, whilst gypsum was more beneficial to silt-sized microaggregate flocculation. Amendments also enhanced the erosion resistance of bauxite residue. Furthermore, wet sieving using the modified Le Bissonnais' (LB) method revealed that in comparison to differential clay swelling and mechanical breakdown, slaking was the major disaggregation mechanism of residue aggregates. The combination of gypsum and vermicompost converted the residue from a sheet-like structure to a granular macroaggregated structure, whilst converting microaggregates from a grain to a granular or prismatic structure. The findings of this work suggest that application of gypsum and vermicompost to bauxite residue may directly influence aggregate size distribution and its micromorphology, resulting in the improvement of both aggregate stability and structure.
Starting Page	2109
Ending Page	2120
Page Count	12
File Format	PDF HTM / HTML
DOI	10.1002/ldr.2737
Volume Number	28
Alternate Webpage(s)	https://hau.collections.crest.ac.uk/15539/1/Will%20Hartley%20Vermicompost%20and%20gypsum%2021.2.17%20upload.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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