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Phosphorus removal ...
Phosphorus removal by slag depends on its mineralogical composition: A comparative study of AOD and EAF slags
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- Renman, Gunno (author)
- KTH,Hållbar utveckling, miljövetenskap och teknik
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- Zuo, Minyu (author)
- KTH,Hållbar utveckling, miljövetenskap och teknik
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- Gustafsson, Jon Petter, 1964- (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,KTH,Hållbar utveckling, miljövetenskap och teknik,Institutionen för mark och miljö,Department of Soil and Environment,Royal Institute of Technology (KTH)
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- Klysybun, Wantana (author)
- Synchrotron Light Research Institute, 111 University Avenue, Muang District, Nakorn, Ratchasima, 30000, Thailand
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(creator_code:org_t)
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- Elsevier, 2018
- 2018
- English.
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In: Journal of Water Process Engineering. - : Elsevier. - 2214-7144. ; 25, s. 105-112
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://res.slu.se/i...
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Abstract
Subject headings
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- Electric arc furnace slag (EAF) and argon oxygen decarburization slag (AOD) were investigated in column experiments to determine the effect of mineralogical composition on their P removal performance and lifespan. Polyethylene glycol (PEG) and NaOH solutions were used for pretreatment of the slags to adjust their dissolution properties. The modified slags exhibited better P removal performance at the beginning of the experiment, but had shorter lifespan than the unmodified slags. AOD and EAF modified with PEG and NaOH achieved 100% P removal during the first 84 and 60 pore volumes, respectively, which were ≥20 pore volumes longer than virgin AOD and EAF. However, virgin EAF and AOD both had a P removal efficiency above 90% during the first 280 pore volumes. Possibly, soluble minerals such as free lime are lost during the modification step, causing a decreased long-term P removal capacity. The XRD results showed that the high P removal ability of AOD and EAF was attributed to the dissolution of beta dicalcium silicate (β-C2) and gamma dicalcium silicate (γ-C2S), which were dominant mineral phases in the slags. Results from SEM-EDS analysis revealed significant P accumulation on the slag surface. Cracks on the EAF slag surface contributed to its longer lifespan. Analysis with P K-edge XANES spectroscopy showed that the P retained on the slag surface was dominated by amorphous calcium phosphate, with a substantial amount of carbonate apatite (around 30%). Amorphous calcium phosphate was transformed to crystalline apatite as the slag aged with column operating time.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Miljöbioteknik -- Vattenbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Biotechnology -- Water Treatment (hsv//eng)
Keyword
- Land and Water Resources Engineering
- Mark- och vattenteknik
Publication and Content Type
- ref (subject category)
- art (subject category)
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