Water treatment sludge can be used as an adsorbent for heavy metals in wastewater streams

Zhou, Y.-F. and Haynes, R. J. (2010). Water treatment sludge can be used as an adsorbent for heavy metals in wastewater streams. In: V. Popov, H. Itoh, U. Mander and C. A. Brebbia, Waste Management and the Environment V. Proceedings. Waste Management 2010: Fifth International Conference on Waste Management and the Environment, Tallinn, Estonia, (379-389). 12-14 July, 2010. doi:10.2495/WM100341


Author Zhou, Y.-F.
Haynes, R. J.
Title of paper Water treatment sludge can be used as an adsorbent for heavy metals in wastewater streams
Conference name Waste Management 2010: Fifth International Conference on Waste Management and the Environment
Conference location Tallinn, Estonia
Conference dates 12-14 July, 2010
Proceedings title Waste Management and the Environment V. Proceedings
Journal name WIT Transactions on Ecology and the Environment
Place of Publication Southampton, Hants, United Kingdom
Publisher W I T Press
Publication Year 2010
Sub-type Fully published paper
DOI 10.2495/WM100341
Open Access Status
ISBN 9781845644604
9781845644611
ISSN 1746-448X
1743-3541
Editor V. Popov
H. Itoh
U. Mander
C. A. Brebbia
Volume 140
Start page 379
End page 389
Total pages 11
Language eng
Formatted Abstract/Summary
Throughout the world, alum is the most widely used coagulant in drinking water treatment. The waste stream from water treatment is alum-derived water treatment sludge and in most localities large quantities of this material are deposited in waste disposal areas. Reuse of this waste stream in an environmentally sustainable manner is therefore a priority. Research has shown that the material is an effective adsorbent of phosphate from aqueous solutions, but its use as an adsorbent for heavy metals has not been investigated. Our research showed that water treatment sludge was an effective adsorbent for Pb(II), Cr(III) and Cr(VI). Adsorption isotherm data fitted equally well to Freundlich and Langmuir equations and kinetic data correlated well to a pseudosecond- order kinetic model, suggesting that the mechanism involved was chemisorption. Adsorption was pH-dependant with percentage sorption of Pb(II) and Cr(III) increasing greatly with increasing pH and that of Cr(VI) decreasing. Cr(VI) could be removed from sludge surfaces with 0.1 M NaOH. At a concentration of 0.1M, HNO3 was effective at removing adsorbed Cr(III) and Pb(II) from the sludge surfaces and regeneration was successful for eight sorption/removal cycles. Other work showed that water treatment sludge had adsorbent properties for Cu, Zn, Cd, As and Se. It was concluded that water treatment sludge is a suitable material from which to develop a low-cost adsorbent for removal of both heavy metal cations and anions from wastewater streams.
Subjects 2300 Environmental Science
Keyword Water treatment sludge
Adsorption isotherms
Cr(III)
Cr(VI)
Pb(II)
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collection: School of Agriculture and Food Sciences
 
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