Utilization of steel-making slag for the uptake of ammonium and phosphate ions from aqueous solution

Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi Okada

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)156-162
Number of pages7
JournalJournal of Hazardous Materials
Volume156
Issue number1-3
DOIs
Publication statusPublished - Aug 15 2008
Externally publishedYes

Fingerprint

Steel
Waste Water
slag
Slags
Phosphates
ammonium
aqueous solution
steel
phosphate
Ions
Eutrophication
Waste Products
Kaolin
ion
Heating
Industry
Acids
ammonium phosphate
Kaolinite
Iron and steel industry

Keywords

  • Acid-treated slag
  • NH and PO uptake
  • Slag-Al(OH)
  • Slag-kaolinite

ASJC Scopus subject areas

  • Chemical Health and Safety
  • Process Chemistry and Technology
  • Safety, Risk, Reliability and Quality
  • Environmental Engineering

Cite this

Utilization of steel-making slag for the uptake of ammonium and phosphate ions from aqueous solution. / Jha, Vinay Kumar; Kameshima, Yoshikazu; Nakajima, Akira; Okada, Kiyoshi.

In: Journal of Hazardous Materials, Vol. 156, No. 1-3, 15.08.2008, p. 156-162.

Research output: Contribution to journalArticle

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