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Enhanced phosphorus bioavailability and heavy metal removal from sewage sludge ash through thermochemical treatment with chlorine donors

  • Jeon, Seulki (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 : 2017.08.04
  • Accepted : 2017.09.12
  • Published : 2018.02.28

Abstract

Direct application of sewage sludge ash (SSA) to agriculture is mostly prohibited due to its heavy metals and limited bioavailability. Thermochemical treatment of SSA with Cl-donors were carried out to remove heavy metals and enhance P bioavailability. $MgCl_2$ and $CaCl_2$ removed more heavy metal than other Cl-donors. Pb was completely removed followed by Cd, Zn, Cu. They also increased P bioavailability by the conversion of Al-P to Ca/Mg-P which was confirmed by chemical fractionation. XRD confirmed the conversion of $AlPO_4$ to $Ca_5(PO_4)_3Cl$, $Ca_3(PO_4)_2$, and $Mg_3(PO_4)_2$ by the thermochemical treatment.

Keywords

Acknowledgement

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

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