Abstract：Several agents were selected for the stabilization of Pb in municipal solid waste incineration (MSWI) fly ash, wherein, the stabilization effects of single and compound agents were studied. Furthermore, the stabilization mechanism was investigated via infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The chelation rate of Pb with organic chelating agents (OCA) addition was higher than that of the inorganic agents (IA), and the Pb leaching concentration could meet the requirements of Hazardous Waste Landfill Pollution Control Standard (GB 18598-2019) with the addition of 2% sodium diethyldithiocarbamate (SDD). For IA, both 5% dosages of sodium sulfide and sodium dihydrogen phosphate could not reach the standard effect. After the stabilization treatment, the proportion of residual state increased, which was more prominent for OCA system, suggesting a better stability against acid and alkali; Leaching concentration of Pb with IA addition was negatively correlated over time, while the OCA addition was opposite due to the oxidation of characteristic functional groups. Cost analysis showed that a compound agent of 0.9% SDD and 3% sodium dihydrogen phosphate could reduce the cost by 26.72% compared with single SDD agent. The characteristic absorption peaks of N, S and P were visible after treatment of the compound agent, and the heavy metals were mainly stabilized via chelation and precipitation. Meanwhile, the mineral composition was no change, but the absorption peak intensity of the crystalline phase weakened.
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