Application of sludge dewatered products to soil and its effects on the leaching behaviour of heavy metals

Qi, Y, Szendrak, D, Yuen, R, Hoadley, A and Mudd, G 2011, 'Application of sludge dewatered products to soil and its effects on the leaching behaviour of heavy metals', Chemical Engineering Journal, vol. 166, no. 2, pp. 586-595.


Document type: Journal Article
Collection: Journal Articles

Title Application of sludge dewatered products to soil and its effects on the leaching behaviour of heavy metals
Author(s) Qi, Y
Szendrak, D
Yuen, R
Hoadley, A
Mudd, G
Year 2011
Journal name Chemical Engineering Journal
Volume number 166
Issue number 2
Start page 586
End page 595
Total pages 10
Publisher Elsevier
Abstract The leaching behaviour of eight heavy metals from the dewatered products of sludge and lignite mixtures before and after application to the soil was investigated using batch tests. It was found that for most of the heavy metals the content in the mixtures fell within relevant EPA guidelines for biosolids application. Leaching tests showed that the leached fraction of most of the metals was low. The addition of the sludge-lignite mixtures to soils to increase the soil carbon content by 0.5%, 1% and 2% affected the leaching behaviour of some heavy metals possibly due to the changes in the conditions, such as pH and redox, of the mixtures. For arsenic and chromium, which are present in the environment as various species with different mobilities, the effect of the mixing on their leaching behaviours was the most significant. Cadmium, mercury and lead generally had low mobility. The lignite may have acted as an adsorbent which bonded the heavy metals, e.g. zinc and lead, and hence reduced their leachability. Together with the availability of nutrients in the sludge-lignite mixtures, the addition of sludge and lignite mixtures as a soil amendment is beneficial in improving soil characteristics and presents the potential to be applied to agricultural soils.
Subject Environmental Engineering not elsewhere classified
Keyword(s) Biosolids
Heavy metal
Leaching test
Lignite
Mobility
Soil amendment
DOI - identifier 10.1016/j.cej.2010.11.029
Copyright notice © 2010 Elsevier B.V.
ISSN 1385-8947
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