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Phosphorus removal performance and speciation in virgin and modified argon oxygen decarburisation slag designed for wastewater treatment

Zuo, Minyu and Renman, Gunno and Gustafsson, Jon Petter and Renman, Agnieszka (2015). Phosphorus removal performance and speciation in virgin and modified argon oxygen decarburisation slag designed for wastewater treatment. Water research. 87, 271-281
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Official URL: http://dx.doi.org/10.1016/j.watres.2015.09.035

Abstract

Argon oxygen decarburisation (ADD) slag may be used for phosphorus (P) removal, as its high pH and weatherable calcium (Ca) minerals provide sufficient Ca2+ and OH- for calcium phosphate (Ca-PO4) precipitation. This study examined the P removal performance of AOD slag for use as wastewater treatment material. Batch experiments were carried out using both synthetic P solution and real wastewater, followed by chemical modelling and X-ray absorption near edge structure (XANES) spectroscopy. The influences of initial P concentration, slag dose and modification by polyethylene glycol (PEG), an effective agent for generation of porous materials, were investigated to determine the optimal conditions for P removal by AOD slag. It was found that virgin AOD slag removed 94.8% of P from a synthetic P solution in 4 h and 97.8% in 10 h. This high P removal was accompanied by a rapid increase in pH from 7.0 to 10.74. The maximum P removal capacity (PRC) from synthetic P solution ranged from 1.3 to 27.5 mg P g(-1). The optimal AOD dose for P removal from wastewater, determined in 8-h batch experiments, was 25 g L-1. PEG modification increased the reaction rate and resulted in higher final pH, increasing PRC by 47.9%. Combined Visual MINTEQ and XANES analysis for detailed examination of P removal mechanisms revealed that the main P removal mechanism was precipitation of calcium phosphate. According to the XANES analysis, the main Ca-PO4 precipitate formed on virgin AOD slag under low initial P concentration and high pH was apatite, while brushite was the dominant product at high initial P concentration and low pH. (C) 2015 Elsevier Ltd. All rights reserved.

Authors/Creators:Zuo, Minyu and Renman, Gunno and Gustafsson, Jon Petter and Renman, Agnieszka
Title:Phosphorus removal performance and speciation in virgin and modified argon oxygen decarburisation slag designed for wastewater treatment
Series/Journal:Water research (0043-1354)
Year of publishing :2015
Depositing date:26 January 2016
Volume:87
Page range:271-281
Number of Pages:11
Publisher:Elsevier
ISSN:0043-1354
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:P Natural resources > P10 Water resources and management
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 201 Civil Engineering > Water Engineering
(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 207 Environmental Engineering > Environmental Management
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
Agrovoc terms:phosphorus, slags, wastewater treatment
Keywords:Phosphorus, Slag, Apatite, Brushite, Visual MINTEQ, XANES
Additional ID:
Type of IDID
Web of Science (WoS)000367413000028
DOI10.1016/j.watres.2015.09.035
ID Code:12989
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:26 Jan 2016 15:05
Metadata Last Modified:25 Mar 2016 00:15

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