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Phosphorus immobilization in Al-drinking water treatment sludge (Al-DWTS) and soil under laboratory conditions
Author(s)
Date Issued
2010-10
Date Available
2011-08-29T10:11:17Z
Abstract
This study assessed the potential reuse of an aluminium coagulated drinking–water treatment sludge (Al–DWTS) as a main substrate in constructed wetland to replace soil for the treatment of P-enriched wastewater. The adsorption isotherm and kinetics of phosphorus (P) removal from high-P solution by Al–DWTS and a local soil from Bailieborough, Ireland, were studied and compared under laboratory conditions. Data of P adsorption were well fitted to the Langmuir and the Freundlich isotherms but the Freundlich isotherm had a higher correlation coefficient. The maximum P adsorption capacity of the Al–DWTS and the soil was 39.4 mg P mg–1 and 9.5 mg P mg–1, respectively, at conditions of pH of 4.0 and temperature of 23 °C. Kinetics studies show that adsorption in both cases followed pseudo-second-order kinetics. The fact that the Al–DWTS exhibited a significantly higher P adsorption capacity at high–P solution compared with the soil suggests that Al–DWTS can be a “novel–waste” bioadsorbent with promising application in wastewater treatment engineering, such as constructed wetland systems.
Sponsorship
Other funder
Other Sponsorship
Environmental Protection Agency
Type of Material
Journal Article
Publisher
Taylor & Francis
Journal
International Journal of Environmental Studies
Volume
67
Issue
5
Start Page
747
End Page
762
Copyright (Published Version)
2010 Taylor & Francis
Subject – LCSH
Phosphorus--Absorption and adsorption
Water treatment plant residuals
Soils--Phosphorus content
Web versions
Language
English
Status of Item
Peer reviewed
ISSN
0020-7233 print
1029-0400 online
This item is made available under a Creative Commons License
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