Phosphorus immobilization in Al-drinking water treatment sludge (Al-DWTS) and soil under laboratory conditions

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Title: Phosphorus immobilization in Al-drinking water treatment sludge (Al-DWTS) and soil under laboratory conditions
Authors: Li, W.C.
Zhao, Y.Q.
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Date: Oct-2010
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.
Funding Details: Other funder
Type of material: Journal Article
Publisher: Taylor & Francis
Copyright (published version): 2010 Taylor & Francis
Keywords: AdsorptionAlum–drinking water treatment sludgePhosphorusSoilWastewater treatment
Subject LCSH: Phosphorus--Absorption and adsorption
Water treatment plant residuals
Soils--Phosphorus content
DOI: 10.1080/00207233.2010.514095
Language: en
Status of Item: Peer reviewed
Appears in Collections:Urban Institute Ireland Research Collection
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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