Journal of Industrial and Engineering Chemistry

  • Volume 46
  • /
  • Pages.62-67
  • /
  • 2017
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  • 1226-086X(pISSN)
  • /
  • 1876-794X(eISSN)
The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Selective acidic elution of Ca from sewage sludge ash for phosphorus recovery under pH control

  • Lim, B.H. (Department of Environmental Sciences and Biotechnology & Institute of Energy and Environment, Hallym University) ;
  • Kim, Dong-Jin (Department of Environmental Sciences and Biotechnology & Institute of Energy and Environment, Hallym University)
  • Received : 2016.07.14
  • Accepted : 2016.10.08
  • Published : 2017.02.25
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Abstract

Phosphorus (P) is recovered from sewage sludge ash (SSA) by selective HCl elution of Ca. Leaching and rearrangement of P were very fast and the amounts of leaching and recombination of P depend strongly on pH. pH control at 4.0 obtained selective elution ratio (Ca(%)/P(%)) of 20 by recombination of P to Al in SSA residue while it was 5.6 without pH control. XRD and element mass balance showed that Ca-P in the raw SSA was converted to Al-P complex during the acid pretreatment.

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Acknowledgement

Supported by : National Research Foundation of Korea (NRF), Hallym University

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