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Effect of aging on phosphorus removal of metallurgical slag and heat reactivation of aged slag
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Mark- och vattenteknik.
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Mark- och vattenteknik.
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Hållbar utveckling, miljövetenskap och teknik, Mark- och vattenteknik.ORCID-id: 0000-0001-8771-7941
2016 (engelsk)Konferansepaper, Oral presentation only (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
2016.
Emneord [en]
ageing, heating, AOD, EAF, BFS
HSV kategori
Forskningsprogram
Mark- och vattenteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-213412OAI: oai:DiVA.org:kth-213412DiVA, id: diva2:1137193
Konferanse
2016 IWA water congress & exhibition
Merknad

QC 20170830

Tilgjengelig fra: 2017-08-30 Laget: 2017-08-30 Sist oppdatert: 2017-08-30bibliografisk kontrollert
Inngår i avhandling
1. Enhanced phosphorus removal from wastewater using virgin and modified slags: performance, speciation and mechanisms
Åpne denne publikasjonen i ny fane eller vindu >>Enhanced phosphorus removal from wastewater using virgin and modified slags: performance, speciation and mechanisms
2017 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Argon oxygen decarburization slag (AOD) was tested in batch and column experiments to investigate its phosphorus (P) removal performance. The effects of factors such as AOD dose, initial P concentration of the feeding solution, and aging on the P removal ability of the slags were analyzed. In a column experiment, electric arc furnace slag (EAF), blast furnace slag (BFS) and AOD were combined in five different ways to determine optimal conditions for P removal. In another column experiment, the three types of slag were modified with polyethylene glycol (PEG) and NaOH to adjust their dissolution properties and the effect on P removal performance was examined. In the batch experiments, AOD exhibited very promising P removal ability. It removed 94.8% of P from 6.5 mg P L-1 synthetic solution in 4 hours with a dose of 5 g L-1. Maximum P removal capacity of 27.5 mg P g-1 was achieved. In the dual-filter column experiment, the column packed with only EAF had the best P removal performance (consistently above 93%). Amorphous calcium phosphate (ACP) was identified as the main P species in the five slag samples collected from the outlet chambers. The contributions from crystalline calcium phosphate (Ca-P) and P adsorbed on iron/aluminum (hydr)oxides were greater in samples from the inlet chambers. The P speciation results revealed that P was predominantly removed by the slags through formation of ACP. The second column experiment showed that modification with PEG and NaOH solution only enhanced short-term P removal by the slags. However, exhaustion of the modified slags occurred much earlier, indicating that the modification process had shortened the lifespan of the slags. Untreated AOD showed better P removal than untreated EAF until pore volume 244, probably due to faster dissolution rate of gamma dicalcium silicate (dominating in AOD according to the XRD results) than of beta dicalcium silicate (dominating in EAF).

sted, utgiver, år, opplag, sider
KTH Royal Institute of Technology, 2017. s. 54
Serie
TRITA-SEED-PHD ; 2017:01
Emneord
AOD, EAF, BFS, Calcium phosphate, XANES, slag mineralogy
HSV kategori
Forskningsprogram
Mark- och vattenteknik
Identifikatorer
urn:nbn:se:kth:diva-213415 (URN)978-91-7729-516-7 (ISBN)
Disputas
2017-09-29, Sal V1, Teknikringen 76, KTH, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

QC 20170830

Tilgjengelig fra: 2017-08-31 Laget: 2017-08-30 Sist oppdatert: 2017-08-31bibliografisk kontrollert

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