Removal of Pb(II), Cr(III) and Cr(VI) from aqueous solutions using alum-derived water treatment sludge

Zhou, Ya-Feng and Haynes, Richard John (2011) Removal of Pb(II), Cr(III) and Cr(VI) from aqueous solutions using alum-derived water treatment sludge. Water Air And Soil Pollution, 215 1-4: 631-643. doi:10.1007/s11270-010-0505-y


Author Zhou, Ya-Feng
Haynes, Richard John
Title Removal of Pb(II), Cr(III) and Cr(VI) from aqueous solutions using alum-derived water treatment sludge
Journal name Water Air And Soil Pollution   Check publisher's open access policy
ISSN 0049-6979
1573-2932
Publication date 2011-02-01
Year available 2010
Sub-type Article (original research)
DOI 10.1007/s11270-010-0505-y
Open Access Status Not Open Access
Volume 215
Issue 1-4
Start page 631
End page 643
Total pages 13
Place of publication Dordrecht, The Netherlands
Publisher Springer Netherlands
Language eng
Formatted abstract
The sorption of Pb(II), Cr(III) and Cr(VI) from aqueous solution using alum-derived water treatment sludge was investigated using the batch adsorption technique. Samples of sludge from two separate water treatment plants were used (one where alum was used alone and one where it was used in combination with activated C). The sorption characteristics of the two samples were generally very similar. Sorption isotherm data for all three ions fitted equally well to both Freundlich and Langmuir equations. Maximum sorption capacity and indices of sorption intensity both followed the order: Cr(III) > Pb(II) > Cr(VI). Kinetic data correlated well with a pseudo-second-order kinetic model suggesting the process involved was chemisorption. Sorption was pH-dependant with percentage sorption of Cr(III) and Pb(II) increasing from <30% to 100% between pH 3 and 6 whilst that of Cr(VI) declined greatly between pH 5 and 8. HNO3 at a concentration of 0.1 M was effective at removing sorbed Cr(III) and Pb(II) from the sludge surfaces and regeneration was successful for eight sorption/removal cycles. It was concluded that water treatment sludge is a suitable material from which to develop a low-cost adsorbent for removal of Cr and Pb from wastewater streams.
Keyword Water treatment sludge
Cr
Pb
Kinetics
Adsorption isotherms
Adsorbent regeneration
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 15 June 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Agriculture and Food Sciences
 
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Created: Sun, 13 Mar 2011, 10:01:10 EST