TY - JOUR
T1 - Enhancement of phosphorus removal with near-neutral pH utilizing steel and ferronickel slags for application of constructed wetlands
AU - Park, Jong Hwan
AU - Kim, Seong Heon
AU - Delaune, Ronald D.
AU - Kang, Byung Hwa
AU - Kang, Se Won
AU - Cho, Ju Sik
AU - Ok, Yong Sik
AU - Seo, Dong Cheol
N1 - Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2014R1A1A2007515).
Publisher Copyright:
© 2016 Elsevier B.V.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2016/10/1
Y1 - 2016/10/1
N2 - The objective of this study was to enhance phosphorus (P) removal while achieving near-neutral pH in aqueous solution utilizing steel slags (Blast furnace slag, BFS; Basic oxygen furnace slag-air cooling, BOFS-A; Basic oxygen furnace slag-rapid cooling, BOFS-R) and ferronickel slag (FNS) for application to constructed wetlands (CWs). The maximum P adsorption capacities (mg kg−1) of the slags were in the order BOFS-R (3233) > BOFS-A (2320) ≫ BFS (607) > FNS (260) based on the Langmuir adsorption isotherm. The pH of the slags were in the following order: BOFS-R (11.9) > BOFS-A (9.0) ≫ BFS (8.9) > FNS (7.5). The basic oxygen furnace slags had the highest P adsorption capacity, while the ferronickel slag had the lowest pH among the tested slags. To achieve high P removal efficiency with near-neutral pH, the BOF slags and ferronickel slag (BOFS-A + FNS and BOFS-R + FNS) were mixed in batch experiments. To achieve effective P removal with near-neutral pH utilizing steel and ferronickel slags, the optimum conditions were found to be the ratio of BOFS-R:FNS of 7:3. Therefore, when mixed slags at the BOFS-R:FNS ratio of 7:3 were applied to CWs, they could achieve high P removal efficiency and near-neutral pH for meeting the acceptable drinking water quality discharge standard.
AB - The objective of this study was to enhance phosphorus (P) removal while achieving near-neutral pH in aqueous solution utilizing steel slags (Blast furnace slag, BFS; Basic oxygen furnace slag-air cooling, BOFS-A; Basic oxygen furnace slag-rapid cooling, BOFS-R) and ferronickel slag (FNS) for application to constructed wetlands (CWs). The maximum P adsorption capacities (mg kg−1) of the slags were in the order BOFS-R (3233) > BOFS-A (2320) ≫ BFS (607) > FNS (260) based on the Langmuir adsorption isotherm. The pH of the slags were in the following order: BOFS-R (11.9) > BOFS-A (9.0) ≫ BFS (8.9) > FNS (7.5). The basic oxygen furnace slags had the highest P adsorption capacity, while the ferronickel slag had the lowest pH among the tested slags. To achieve high P removal efficiency with near-neutral pH, the BOF slags and ferronickel slag (BOFS-A + FNS and BOFS-R + FNS) were mixed in batch experiments. To achieve effective P removal with near-neutral pH utilizing steel and ferronickel slags, the optimum conditions were found to be the ratio of BOFS-R:FNS of 7:3. Therefore, when mixed slags at the BOFS-R:FNS ratio of 7:3 were applied to CWs, they could achieve high P removal efficiency and near-neutral pH for meeting the acceptable drinking water quality discharge standard.
KW - Basic oxygen furnace slag-air cooling (BOFS-A)
KW - Basic oxygen furnace slag-rapid cooling (BOFS-R)
KW - Blast furnace slag (BFS)
KW - Ferronickel slag (FNS)
KW - Freundlich isotherm
KW - Langmuir isotherm
KW - Phosphorus adsorption
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U2 - 10.1016/j.ecoleng.2016.06.052
DO - 10.1016/j.ecoleng.2016.06.052
M3 - Article
AN - SCOPUS:84978387834
VL - 95
SP - 612
EP - 621
JO - Ecological Engineering
JF - Ecological Engineering
SN - 0925-8574
ER -