NDLI: Revegetation Strategies for Bauxite Refinery Residue: A Case Study of Alcan Gove in Northern Territory, Australia

Content Provider	Springer Nature Link
Author	Wehr, J. Bernhard Fulton, Ian Menzies, Neal W.
Copyright Year	2006
Abstract	Alumina extraction from bauxite ore with strong alkali produces waste bauxite refinery residue consisting of residue sand and red mud. The amount and composition of refinery residue depend on the purity of the bauxite ore and extraction conditions, and differs between refineries. The refinery residue is usually stored in engineered disposal areas that eventually have to be revegetated. This is challenging because of the alkaline and sodic nature of the residue. At Alcan Gove’s bauxite refinery in Gove, Northern Territory, Australia, research into revegetation of bauxite residue has been conducted since the mid-1970s. In this review, we discuss approaches taken by Alcan Gove to achieve revegetation outcomes (soil capping of refinery residue) on wet-slurry disposal areas. Problems encountered in the past include poor drainage and water logging during the wet season, and salt scalding and capillary rise during the dry season. The amount of available water in the soil capping is the most important determinant of vegetation survival in the seasonally dry climate. Vegetation cover was found to prevent deterioration of the soil cover by minimising capillary rise of alkalinity from the refinery residue. The sodicity and alkalinity of the residue in old impoundments has diminished slightly over the 25 years since it was deposited. However, development of a blocky structure in red mud, presumably due to desiccation, allows root penetration, thereby supplying additional water to salt and alkali-tolerant plant species. This has led to the establishment of an ecosystem that approaches a native woodland.
Starting Page	297
Ending Page	306
Page Count	10
File Format	PDF
ISSN	0364152X
Journal	Environmental Management
Volume Number	37
Issue Number	3
e-ISSN	14321009
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-02-02
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rehabilitation Red mud Residue sand Gypsum Drainage Capillary rise Ecology Atmospheric Protection/Air Quality Control/Air Pollution Environmental Management Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Forestry Management Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Ecology Pollution Global and Planetary Change

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