NDLI: Behaviour and dynamics of di-ammonium phosphate in bauxite processing residue sand in Western Australia—I. NH$_{3}$ volatilisation and residual nitrogen availability

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Behaviour and dynamics of di-ammonium phosphate in bauxite processing residue sand in Western Australia—I. NH$_{3}$ volatilisation and residual nitrogen availability

Behaviour and dynamics of di-ammonium phosphate in bauxite processing residue sand in Western Australia—II. Phosphorus fractions and availability

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Behaviour and dynamics of di-ammonium phosphate in bauxite processing residue sand in Western Australia—I. NH$_{3}$ volatilisation and residual nitrogen availability

Content Provider	Springer Nature Link
Author	Chen, C. R. Phillips, I. R. Wei, L. L. Xu, Z. H.
Copyright Year	2009
Abstract	Australia is the largest producer of bauxite in the world, with an annual output of approximately 62 million metric dry tons in 2007. For every tonne of alumina, about 2 tonnes of highly alkaline and highly saline bauxite-processing residue are produced. In Western Australia, Alcoa World Alumina, Australia (Alcoa) produces approximately 15 MT of residue annually from its refineries (Kwinana, Pinjarra and Wagerup). The bauxite-processing residue sand (BRS) fraction represents the primary material for rehabilitating Alcoa’s residue disposal areas (RDAs). However, the inherently hostile characteristics (high alkalinity, high salinity and poor nutrient availability) of BRS pose severe limitations for establishing sustainable plant cover systems. Alcoa currently applies 2.7 t ha$^{−1}$ of di-ammonium phosphate ((NH$_{4}$)$_{2}$HPO$_{4}$; DAP)-based fertiliser as a part of rehabilitation of the outer residue sand embankments of its RDAs. Limited information on the behaviour of the dominant components of this inorganic fertiliser in highly alkaline BRS is currently available, despite the known effects of pH on ammonium (NH$_{4}$) and phosphorus (P) behaviour. The aim of this study was to quantify the effects of pH on NH$_{3}$ volatilisation and residual nitrogen (N) in BRS following DAP applications.The sponge-trapping and KCl-extraction method was used for determining NH$_{3}$ volatilisation from surface-applied DAP in samples of BRS collected from each of Alcoa’s three Western Australia Refineries (Kwinana, Pinjarra, Wagerup) under various pH conditions (pH 4, 7, 9 and 11). Following cessation of volatilisation, the residual N was extracted from BRS using 2 M KCl and concentrations of NH4+–N and NO3−–N were determined by flow injection analysis.The quantities of NH$_{3}$ volatilised increased dramatically as the pH increased from 4 to 11. Much of the N lost as NH$_{3}$ (up to 95.2%) occurred within a short period (24 h to 7 days), particularly for the pH 9 and 11 treatments. Concentrations of residual NH4+–N recovered in DAP-treated BRS at the end of the experiment decreased with increasing pH. This finding was consistent with increasing loss of N via volatilisation as pH increased. The concentration of NO3−–N was very low due to no nitrification in BRS.The pH was a key driver for NH$_{3}$ volatilisation from DAP-treated BRS and primarily controlled N dynamics in BRS. Results indicate that NH$_{4}$ not adsorbed by BRS was highly susceptible to volatilisation. The likely lack of nitrifying bacteria did not allow conversion of ammonium to nitrate, thereby further exacerbating the potential for loss via volatilisationIt was demonstrated that the pH is the key factor controlling the loss of inorganic N from BRS. Although volatilisation was considerably lower at pH 4, achieving this pH reduction in the field is not possible at present. Findings from this study highlight the need to better understand which forms of N fertiliser are most suitable for use in highly alkaline BRS.Although pH reduction is the most likely means of stopping NH$_{3}$ volatilisation in BRS, it is economically and operationally unfeasible to add sufficient acidity for adequately lowering pH in the BRS for revegetation. More attention on forms of fertilisers more suitable to highly alkaline, microbially inert soil conditions appears to be warranted.
Starting Page	1098
Ending Page	1109
Page Count	12
File Format	PDF
ISSN	09441344
Journal	Environmental Science and Pollution Research
Volume Number	17
Issue Number	5
e-ISSN	16147499
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-11-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bauxite-processing residue sand pH NH$_{3}$ volatilisation Nitrogen availability Di-ammonia phosphate Industrial Pollution Prevention Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Atmospheric Protection/Air Quality Control/Air Pollution Environment
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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Behaviour and dynamics of di-ammonium phosphate in bauxite processing residue sand in Western Australia—II. Phosphorus fractions and availability

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