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Heavy metal stabilization in MSWI fly ash using an additive-assisted microwave hydrothermal method
Zhiwen Xu,Zhiyuan Liang,Huaishuang Shao,Qinxin Zhao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
The dioxins and leachable heavy metals in municipal solid waste incineration (MSWI) fly ash made it ahazardous waste. Microwave hydrothermal with four common additives, Na2S, Na2SiO3, Na2B4O7 orH3BO3, was researched at different temperatures, L/S ratios, time and additive concentrations by singlefactor and orthogonal methods to achieve effective heavy metal stabilization and waste reuse of MSWIfly ash. The samples were investigated by XRD, BET, SEM, ICP-MS to determine the influence ofadditive-assisted microwave hydrothermal on heavy metals stabilizing. According to the results of theorthogonal study, the degree of influence of each parameter heavy metals stabilization was in the orderof additive, temperature, additive concentration, time and L/S ratio. Single-factor experiments suggestedthat the conditions of 125 C, 10 min, 3 mol/L Na2S and 2 mL/g were enough for the leaching concentrationof heavy metals meeting the specified limitation of China. The results of analyses confirmed thatmicrowave hydrothermal treatment with Na2S could enhance heavy metals stabilizing by forming zeolitesfor adsorption, precipitation and convert heavy metals to a more stable state. Microwave hydrothermalwith Na2S was a promising method to manage MSWI fly ash, which greatly decrease the reactiontime and realize wastes utilization.
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