Gustafsson, Jon-Petter
- Department of Soil and Environment, Swedish University of Agricultural Sciences
- Royal Institute of Technology (KTH)
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.
Keywords
Phosphorus; Slag; Apatite; Brushite; Visual MINTEQ; XANES
Published in
Water Research
2015, volume: 87, pages: 271-281
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
SLU Authors
Global goals (SDG)
SDG3 Good health and well-being
SDG6 Clean water and sanitation
UKÄ Subject classification
Environmental Management
Oceanography, Hydrology, Water Resources
Water Engineering
Publication identifier
- DOI: https://doi.org/10.1016/j.watres.2015.09.035
Permanent link to this page (URI)
https://res.slu.se/id/publ/69478