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
| Autor: | Il Sang Huh, Juhee Son, Yunsung Yoo, Sang Won Park, Dongwoo Kang, Jinwon Park |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Aqueous solution Scanning electron microscope General Chemical Engineering Metal ions in aqueous solution Inorganic chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Wastewater Fly ash Environmental Chemistry Leachate Leaching (metallurgy) Inductively coupled plasma 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 380:122534 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2019.122534 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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