TY - JOUR
T1 - Utilization of steel-making slag for the uptake of ammonium and phosphate ions from aqueous solution
AU - Jha, Vinay Kumar
AU - Kameshima, Yoshikazu
AU - Nakajima, Akira
AU - Okada, Kiyoshi
N1 - Funding Information:
VKJ thanks the Ministry of Education, Culture, Sports, Science and Technology, Japan for an award of a graduate fellowship (Monbukagakusho Scholarship) under which the present study was carried out. A part of this study is financially supported by The Steel Industrial Foundation for the Advancement of Environmental Protection Technology. We thank the Oita Factory, Nippon Steel Co., Oita, Japan for providing the slag. We are also thankful to Professor Dr. K.J.D. MacKenzie of Victoria University of Wellington, Wellington, New Zealand for critical reading and editing of the manuscript.
PY - 2008/8/15
Y1 - 2008/8/15
N2 - Steel-making slag, a waste by-product of the Steel Industry, constitutes a major disposal problem. In the present study, excellent adsorbent materials for reducing eutrophication in wastewaters have been prepared from this slag. Heated samples of acid-treated slag and mixtures of slag with kaolinite and Al(OH)3 were examined to determine their uptake capacities for NH4+ and PO43- from aqueous solutions. In general, the equilibrium pH of the solution increased in comparison to initial pH with the uptake of target ions, the sample activated slag-Al(OH)3 showing the smallest change. The highest PO43- uptake capacity was obtained with the slag-Al(OH)3 mixture heated at 900 °C whereas the highest uptake of NH4+ was found in the slag-Al(OH)3 mixture heated at 800 °C. The uptake rates for PO43- and NH4+ by the slag-Al(OH)3 mixture heated at 900 °C were 2.91 and 0.65 μmol/(g min), respectively. It was shown that heating slag composites prior to incorporation into wastewater treatment filters resulted in an increased degree of NH4+ and PO43- uptake.
AB - Steel-making slag, a waste by-product of the Steel Industry, constitutes a major disposal problem. In the present study, excellent adsorbent materials for reducing eutrophication in wastewaters have been prepared from this slag. Heated samples of acid-treated slag and mixtures of slag with kaolinite and Al(OH)3 were examined to determine their uptake capacities for NH4+ and PO43- from aqueous solutions. In general, the equilibrium pH of the solution increased in comparison to initial pH with the uptake of target ions, the sample activated slag-Al(OH)3 showing the smallest change. The highest PO43- uptake capacity was obtained with the slag-Al(OH)3 mixture heated at 900 °C whereas the highest uptake of NH4+ was found in the slag-Al(OH)3 mixture heated at 800 °C. The uptake rates for PO43- and NH4+ by the slag-Al(OH)3 mixture heated at 900 °C were 2.91 and 0.65 μmol/(g min), respectively. It was shown that heating slag composites prior to incorporation into wastewater treatment filters resulted in an increased degree of NH4+ and PO43- uptake.
KW - Acid-treated slag
KW - NH and PO uptake
KW - Slag-Al(OH)
KW - Slag-kaolinite
UR - http://www.scopus.com/inward/record.url?scp=44649117561&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=44649117561&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2007.12.009
DO - 10.1016/j.jhazmat.2007.12.009
M3 - Article
C2 - 18206297
AN - SCOPUS:44649117561
VL - 156
SP - 156
EP - 162
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
IS - 1-3
ER -