Sammanfattning

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.

Nyckelord

Phosphorus; Slag; Apatite; Brushite; Visual MINTEQ; XANES

Publicerad i

Water Research
2015, Volym: 87, sidor: 271-281
Utgivare: PERGAMON-ELSEVIER SCIENCE LTD

SLU författare

• Gustafsson, Jon-Petter

  • Institutionen för mark och miljö, Sveriges lantbruksuniversitet
    
  • Kungliga Tekniska Högskolan (KTH)

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UKÄ forskningsämne

Miljöledning
Oceanografi, hydrologi, vattenresurser
Vattenteknik


Publikationens identifierare

DOI: https://doi.org/10.1016/j.watres.2015.09.035

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/69478