Use of bone meal amendments to immobilise Pb, Zn and Cd in soil: A leaching column study

The aim of this study is to test the stabilisation of metals in contaminated soils via the formation of low-solubility metal phosphates. Bone apatite, in the form of commercially available bone meal, was tested as a phosphate source on a mine waste contaminated made-ground with high levels of Pb, Zn...

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Bibliographic Details
Published in:Environmental pollution (1987) 2006-12, Vol.144 (3), p.816-825
Main Authors: Sneddon, I.R., Orueetxebarria, M., Hodson, M.E., Schofield, P.F., Valsami-Jones, E.
Format: Article
Language:English
Subjects:
Adsorption
Animals
Apatite
Applied sciences
Biodegradation, Environmental
Biological Products
Bone meal
Cadmium
Decontamination. Miscellaneous
diethylenetriaminepentaacetic acid
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
extraction
heavy metals
Hydrogen-Ion Concentration
immobilization in soil
Industrial Waste
leachates
leaching
Lead
Metal immobilisation
Metals, Heavy
mine spoil
Minerals
Mining
Phosphate
phosphates
polluted soils
Pollution
Pollution, environment geology
soil amendments
Soil and sediments pollution
Soil column
Soil Pollutants
soil pollution
water solubility
X-Ray Diffraction
Zinc
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Summary:The aim of this study is to test the stabilisation of metals in contaminated soils via the formation of low-solubility metal phosphates. Bone apatite, in the form of commercially available bone meal, was tested as a phosphate source on a mine waste contaminated made-ground with high levels of Pb, Zn and Cd. Triplicate leaching columns were set up at bone meal to soil ratios of 1:25 and 1:10, in addition to unamended controls, and were run for 18 months. The columns were irrigated daily with a synthetic rain solution at pH of 2, 3, and 4.4. After 100 days, the leachate Pb, Zn and Cd concentrations of all amended columns were significantly reduced. For 1:10 treatments, release of these metals was suppressed throughout the trial. For 1:25 treatments, Zn and Cd concentrations in the leachates began to increase after 300 days. DTPA and water extractions showed that Pb and Cd were more strongly held in the amended soils. This study concludes that the complexity of soil processes and the small quantities of metals sequestered precluded determination of a metal immobilisation mechanism. An extended (18 months) leaching column study of metal (Pb, Zn, Cd) immobilisation using bone meal as a source of phosphate, demonstrating positive results.
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2006.02.008