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 journalArticlepeer-review

62 Citations (Scopus)


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
Issue number1-3
Publication statusPublished - Aug 15 2008
Externally publishedYes


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

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis


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