Phosphorus removal from aqueous solution by steel making slag – Mechanisms and performance optimisation

Vu, MT; Nguyen, LN; Hasan Johir, MA; Ngo, HH; Skidmore, C; Fontana, A; Galway, B; Bustamante, H; Nghiem, LD

Phosphorus removal from aqueous solution by steel making slag – Mechanisms and performance optimisation

Vu, MT Nguyen, LN Hasan Johir, MA Ngo, HH Skidmore, C Fontana, A Galway, B Bustamante, H Nghiem, LD

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Journal of Cleaner Production, 2021, 284
Issue Date:: 2021-02-15

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Field	Value	Language
dc.contributor.author	Vu, MT
dc.contributor.author	Nguyen, LN
dc.contributor.author	Hasan Johir, MA
dc.contributor.author	Ngo, HH
dc.contributor.author	Skidmore, C
dc.contributor.author	Fontana, A
dc.contributor.author	Galway, B
dc.contributor.author	Bustamante, H
dc.contributor.author	Nghiem, LD
dc.date.accessioned	2021-03-28T00:47:34Z
dc.date.available	2021-03-28T00:47:34Z
dc.date.issued	2021-02-15
dc.identifier.citation	Journal of Cleaner Production, 2021, 284
dc.identifier.issn	0959-6526
dc.identifier.issn	1879-1786
dc.identifier.uri	http://hdl.handle.net/10453/147557
dc.description.abstract	© 2020 This study aims to evaluate a passive inexpensive process to remove the residual phosphorus (P) from wastewater treatment effluents prior to discharge to the environment. This work also differentiates between surface adsorption and chemical precipitation in the bulk solution as key P removal mechanisms by steel-making slag. Experimental results show that P removal efficiency is governed by steel-making slag particle size, initial P content and ratio of steel-making slag mass to aqueous solution volume. The results demonstrate the potential of steel-making slag for removing dissolved phosphate from wastewater especially as a polishing step. Even at an elevated concentration of P of 5 mg/L, 90% P removal was achieved using 5 kg steel-making slag with particle size of 0.15–0.6 mm for each m3 aqueous solution. Higher removal efficiency was also achievable through process optimisation. In particular, P removal by steel-making slag can be significantly enhanced, and nearly complete removal (>99%) can be achievable by buffering the aqueous solution at pH of 5.6. This study also established the isotherms and kinetics of the adsorption of P to steel-making slag to identify key removal mechanisms. Experimental data systematically indicate that P removal by steel-making slag is governed by both adsorption and chemical precipitation. At the early stage of the removal process, adsorption is the dominating removal mechanism, while the P removal via chemical precipitation can occur once the release of Ca2+ calcium into the aqueous phase is sufficient to form calcium phosphate precipitates. Overall, P removal by chemical precipitation depends on both pH and Ca2+ concentration in aqueous solution.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation	http://purl.org/au-research/grants/arc/IH170100009
dc.relation.ispartof	Journal of Cleaner Production
dc.relation.isbasedon	10.1016/j.jclepro.2020.124753
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0907 Environmental Engineering, 0910 Manufacturing Engineering, 0915 Interdisciplinary Engineering
dc.subject.classification	Environmental Sciences
dc.title	Phosphorus removal from aqueous solution by steel making slag – Mechanisms and performance optimisation
dc.type	Journal Article
utslib.citation.volume	284
utslib.for	0904 Chemical Engineering
utslib.for	0907 Environmental Engineering
utslib.for	0907 Environmental Engineering
utslib.for	0910 Manufacturing Engineering
utslib.for	0915 Interdisciplinary Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access	*
dc.date.updated	2021-03-28T00:47:31Z
pubs.publication-status	Published
pubs.volume	284

Abstract:

© 2020 This study aims to evaluate a passive inexpensive process to remove the residual phosphorus (P) from wastewater treatment effluents prior to discharge to the environment. This work also differentiates between surface adsorption and chemical precipitation in the bulk solution as key P removal mechanisms by steel-making slag. Experimental results show that P removal efficiency is governed by steel-making slag particle size, initial P content and ratio of steel-making slag mass to aqueous solution volume. The results demonstrate the potential of steel-making slag for removing dissolved phosphate from wastewater especially as a polishing step. Even at an elevated concentration of P of 5 mg/L, 90% P removal was achieved using 5 kg steel-making slag with particle size of 0.15–0.6 mm for each m3 aqueous solution. Higher removal efficiency was also achievable through process optimisation. In particular, P removal by steel-making slag can be significantly enhanced, and nearly complete removal (>99%) can be achievable by buffering the aqueous solution at pH of 5.6. This study also established the isotherms and kinetics of the adsorption of P to steel-making slag to identify key removal mechanisms. Experimental data systematically indicate that P removal by steel-making slag is governed by both adsorption and chemical precipitation. At the early stage of the removal process, adsorption is the dominating removal mechanism, while the P removal via chemical precipitation can occur once the release of Ca2+ calcium into the aqueous phase is sufficient to form calcium phosphate precipitates. Overall, P removal by chemical precipitation depends on both pH and Ca2+ concentration in aqueous solution.

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http://hdl.handle.net/10453/147557