Heavy-metal reduction and solidification in municipal solid waste incineration (MSWI) fly ash using water, NaOH, KOH, and NH4OH in combination with CO2 uptake procedure

Dongwoo Kang, Juhee Son, Yunsung Yoo, Sangwon Park, Il Sang Huh, Jinwon Park

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Abstract

A new method for reducing heavy metals in municipal solid waste incineration (MSWI) fly ash was investigated. In many previous studies, acidic leaching was regarded as a standard method for metal-ion extraction. However, this process requires additional treatment of the wastewater containing heavy-metal components. Therefore, in this study, we used basic leaching solvents, i.e., 0.5 M aqueous NaOH, KOH, and NH4OH. The leachates and remaining solids were qualitatively and quantitatively analyzed. To facilitate the handling of the extracted heavy-metal components, the leached metal ions were fixed and precipitated using a CO2 uptake procedure. The solids were analyzed using X-ray fluorescence and X-ray diffraction, and scanning electron microscope images were obtained. The leachates were analyzed using inductively coupled plasma optical emission spectroscopy. In contrast to conventional acidic extraction, heavy-metal reduction and fixation, as well as the mass reduction of the waste, could be achieved with the proposed method.

Original languageEnglish
Article number122534
JournalChemical Engineering Journal
Volume380
DOIs
Publication statusPublished - 2020 Jan 15

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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