Copper and trace metal fractionation in sludge
Virkutyte, Jurate (2005) Copper and trace metal fractionation in sludge. Environmental Pollution, 138 (3). pp. 517-528.
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The effect of electrokinetic treatment (0.15 mA cm−2) on the metal fractionation in anaerobic granular sludge artificially contaminated with copper (initial copper concentration 1000 mg kg−1 wet sludge) was studied. Acidification of the sludge (final pH 4.2 in the sludge bed) with the intention to desorb the copper species bound to the organic/sulfides and residual fractions did not result in an increased mobility, despite the fact that a higher quantity of copper was measured in the more mobile (i.e. exchangeable/carbonate) fractions at final pH 4.2 compared to circum-neutral pH conditions. Also addition of the chelating agent EDTA (Cu2+:EDTA4− ratio 1.2:1) did not enhance the mobility of copper from the organic/sulfides and residual fractions, despite the fact that it induced a reduction of the total copper content of the sludge. The presence of sulfide precipitates likely influences the copper mobilisation from these less mobile fractions, and thus makes EDTA addition ineffective to solubilise copper from the granules.
Electrokinetic treatment of copper contaminated anaerobic granular sludge at 0.15 mA cm−2 for 14 days induces copper and trace metal mobility as well as changes in their fractionation (i.e. bonding forms). Electrokinetic treatment of copper contaminated anaerobic granular sludge at 0.15 mA cm−2 for 14 days induces copper and trace metal mobility as well as changes in their fractionation (i.e. bonding forms).
|Item Type:||Article (UNSPECIFIED)|
|Keywords:||Fractionation, Copper, Electrical treatment, Granular sludge|
© 2005 Elsevier. : This journal is available online - use hypertext links above.
|Date Deposited:||26 Oct 2006|
|FoR Codes:||09 ENGINEERING > 0907 Environmental Engineering > 090703 Environmental Technologies @ 0%
09 ENGINEERING > 0907 Environmental Engineering > 090799 Environmental Engineering not elsewhere classified @ 0%
09 ENGINEERING > 0907 Environmental Engineering > 090702 Environmental Engineering Modelling @ 0%