Phosphorus recovery from sewage sludge ash through an electrodialytic process

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Abstract

The electrodialytic separation process (ED) was applied to sewage sludge ash (SSA) aiming at phosphorus (P) recovery. As the SSA may have high heavy metals contents, their removal was also assessed. Two SSA were sampled, one immediately after incineration (SA) and the other from an open deposit (SB). Both samples were ED treated as stirred suspensions in sulphuric acid for 3, 7 and 14. days. After 14. days, phosphorus was mainly mobilized towards the anode end (approx. 60% in the SA and 70% in the SB), whereas heavy metals mainly electromigrated towards the cathode end. The anolyte presented a composition of 98% of P, mainly as orthophosphate, and 2% of heavy metals. The highest heavy metal removal was achieved for Cu (ca. 80%) and the lowest for Pb and Fe (between 4% and 6%). The ED showed to be a viable method for phosphorus recovery from SSA, as it promotes the separation of P from the heavy metals.

Original languageEnglish
Pages (from-to)886-892
Number of pages7
JournalWaste Management
Volume34
Issue number5
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • Electrodialytic separation
  • Heavy metals
  • Phosphorus
  • Sewage sludge ash

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