A1 Journal article (refereed)
To incinerate or not? : Effects of incineration on the concentrations of heavy metals and leaching efficiency of post-precipitated sewage sludge (RAVITA™) (2020)

Reuna, S., & Väisänen, A. (2020). To incinerate or not? : Effects of incineration on the concentrations of heavy metals and leaching efficiency of post-precipitated sewage sludge (RAVITA™). Waste Management, 118, 241-246. https://doi.org/10.1016/j.wasman.2020.08.022

JYU authors or editors

Publication details

All authors or editors: Reuna, Sini; Väisänen, Ari

Journal or series: Waste Management

ISSN: 0956-053X

eISSN: 1879-2456

Publication year: 2020

Volume: 118

Pages range: 241-246

Publisher: Elsevier

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1016/j.wasman.2020.08.022

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/73186

Abstract

The major element and heavy metal concentrations of post-precipitated sewage sludge (PPS) and its ash residue (PPA) were determined using microwave digestion followed by inductively coupled plasma optical emission spectrometry (ICP-OES) and mass spectrometry (ICP-MS). To the best of our knowledge, this has not been previously done. In both PPS and PPA the heavy metal concentrations were clearly below the average concentrations than those encountered in sewage sludge in Europe. The leaching efficiency of the metal (Al/ Fe) used as a precipitation agent from post-precipitated sludge and its ash residue with phosphoric acid was also investigated with previously optimized leaching conditions. Tests resulted in leaching efficiencies for Al of 85 ± 1% and 99.5 ± 0.7% for PPS and PPA, respectively which were produced with aluminum as precipitation agent for phosphorus. Sludge, which was produced using iron as a precipitation agent, had a leaching efficiency of Fe 36.6 ± 0.9% and 68.0 ± 1.1%, for PPS and PPA, respectively. The leaching efficiency for P was 94 ± 3% and 96 ± 5% for Al-PPA and Fe-PPA, respectively.

Keywords: phosphorus; recovery (recapture); sewage sludge; dissolution (active); heat treatment; heavy metals

Free keywords: phosphorus recovery; sewage sludge ash; characterization; thermal treatment

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 2