Use of inorganic wastes as immobilizing agents for soluble P in green waste-based composts

Belyaeva, O. N. and Haynes, R. J. (2012) Use of inorganic wastes as immobilizing agents for soluble P in green waste-based composts. Environmental Science and Pollution Research, 19 6: 2138-2150. doi:10.1007/s11356-011-0713-z

Author Belyaeva, O. N.
Haynes, R. J.
Title Use of inorganic wastes as immobilizing agents for soluble P in green waste-based composts
Journal name Environmental Science and Pollution Research   Check publisher's open access policy
ISSN 0944-1344
Publication date 2012-07
Sub-type Article (original research)
DOI 10.1007/s11356-011-0713-z
Volume 19
Issue 6
Start page 2138
End page 2150
Total pages 13
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2013
Language eng
Formatted abstract
Purpose: The study examines the effectiveness of red mud, blast furnace (BF) slag, and alum-derived water treatment sludge as immobilizing agents for excessive soluble P that had accumulated in three green waste-based composts.
Methods: The three wastes were applied at 0%, 5%, 10%, and 20% w/w to three different composts, all containing extremely high concentrations of extractable P, and were incubated for 60 days. Water-soluble P was measured regularly throughout the incubation period, and at the end, P extractable with resin, 0. 05 M NaHCO 3, and 0. 005 M H 2SO 4 were also measured.
Results: In the water extracts, inorganic P made up more than 85% of the total P present. All three materials had the ability to adsorb P and thus lowered water-soluble P concentrations. Water treatment sludge was clearly the most effective material, and this was attributed to its amorphous nature (thus, large Brunauer-Emmett-Teller surface area) and its acid pH (6. 8) compared with the alkaline pH (10-11) of the other two materials. Water treatment sludge was also the most effective at lowering resin- and NaHCO 3-extractable P. When H 2SO 4 was used as the extractant, BF slag tended to be the most effective material at lowering extractable P, followed by water treatment sludge, and red mud. That is, the P immobilized by water treatment sludge was extractable with acid but not with water, resin, or NaHCO 3.
: Water treatment sludge has the potential to be used as an effective immobilizing agent for soluble P in composts, and it should be trialed under field conditions.
Keyword Water treatment sludge
Water treatment residuals
Blast furnace slag
Red mud
P immobilization
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Official 2013 Collection
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 15 Nov 2012, 15:14:12 EST by System User on behalf of School of Agriculture and Food Sciences