Title: Variations of metal distribution in sewage sludge composting
Authors: Nomeda, Sabiene
Valdas, Paulauskas
Chen, Shen-Yi
Lin, Jih-Gaw
Institute of Environmental Engineering
Issue Date: 2008
Abstract: In the study, the variations of heavy metal distributions (of Cu, Mn, Pb, and Zn) during the sewage S]sludge composting process were investigated by sequential extraction procedures. The total content of Cu and Zn ill the composted mixture increased after the composting process, Mn and Zn were mainly found in mobile fractions (exchangeable fraction (H), carbonate fraction (F2), and Fe/Mn oxide fraction (F3)). Cu and Pb were strongly associated with the stable fractions (organic matter/sulfides fraction (F4) and residual fraction (F5)). These five metal fractions were used to calculate the metal mobility (bioavailability) in the sewage sludge and composted mixture. The mobility (bioavailability) of Mn, Pb, and Zn (but not Cu) increased during the composting process. The metal mobility in the composted mixture ranked in the following order: Mn > Zn > Pb > Cu. (c) 2007 Elsevier Ltd. All rights reserved.
URI: http://hdl.handle.net/11536/9863
ISSN: 0956-053X
DOI: 10.1016/j.wasman.2007.06.022
Volume: 28
Issue: 9
Begin Page: 1637
End Page: 1644
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