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Phosphorus removal ...
Phosphorus removal performance and speciation in virgin and modified argon oxygen decarburisation slag designed for wastewater treatment
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- Zuo, Minyu (author)
- KTH,Mark- och vattenteknik
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- Renman, Gunno (author)
- KTH,Mark- och vattenteknik
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- Gustafsson, Jon Petter (author)
- Sveriges lantbruksuniversitet,KTH,Mark- och vattenteknik,Swedish University of Agricultural Sciences, Sweden,Institutionen för mark och miljö,Department of Soil and Environment,Royal Institute of Technology (KTH)
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- Renman, Agnieszka (author)
- KTH,Mark- och vattenteknik
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(creator_code:org_t)
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- Elsevier, 2015
- 2015
- English.
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In: Water Research. - : Elsevier. - 0043-1354 .- 1879-2448. ; 87, s. 271-281
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik -- Miljöledning (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering -- Environmental Management (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Samhällsbyggnadsteknik -- Vattenteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Civil Engineering -- Water Engineering (hsv//eng)
Keyword
- Phosphorus
- Slag
- Apatite
- Brushite
- Visual MINTEQ
- XANES
- Land and Water Resources Engineering
- Mark- och vattenteknik
Publication and Content Type
- ref (subject category)
- art (subject category)
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