Phosphorus recovery as AlPO 4 from beneficially reused aluminium sludge arising from water treatment

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Title: Phosphorus recovery as AlPO 4 from beneficially reused aluminium sludge arising from water treatment
Authors: Zhao, X.H.
Zhao, Y.Q.
Kearney, P.
Permanent link: http://hdl.handle.net/10197/4865
Date: Jan-2013
Abstract: The purpose of this study was to develop an efficient and, possibly, a practically operated methodology to recover phosphorus (P) from P-saturated dewatered aluminium sludge cakes (DASC) after the DASC have been beneficially reused as constructed wetlands substrate for P-rich wastewater treatment. A three-step procedure of 1) P extraction by H 2SO 4, 2) decolorization of extraction leachate via H 2O 2 oxidation, and 3) AlPO 4 precipitation by pH adjustment, has been explored. The optimal conditions to form the precipitates of AlPO 4 were determined, with 97% of P and 99% of Al being recovered. The obtained compounds were identified by XRD, FTIR and SEM analyses. Although the purity, structure, characteristics and production control of the compounds are worthy of further investigation, this study provides a showcase of a ‘closed loop’ regarding the beneficial reuse of a ‘waste’ and the recovery of useful elements after the reuse.
Type of material: Journal Article
Publisher: Informa UK (Taylor & Francis)
Copyright (published version): 2013 Informa UK (Taylor & Francis)
Keywords: P resource;aluminium sludge;P recovery;chemical precipitation;AlPO4
DOI: 10.1080/09593330.2012.692714
Language: en
Status of Item: Peer reviewed
Appears in Collections:Earth Institute Research Collection
Civil Engineering Research Collection

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