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• W3108824537 abstract "• The migration characteristics of heavy metals during sludge pyrolysis were studied. • The activation energy of sludge pyrolysis was determined by the Model-free method. • As the pyrolysis temperature increased, the concentration of CO decreased and then increased. • Cu, Cr, and Ni were seldom involved in migration during pyrolysis. • As, Cd, and Hg readily migrated even at low pyrolysis temperatures. A comprehensive study was conducted to investigate the pyrolysis characteristics of municipal sludge, and the activation energy of sludge pyrolysis was determined using the Model-free method. The detailed migration characteristics of heavy metals in the pyrolysis products were also investigated at different pyrolysis temperatures (250–850 °C). The results demonstrate that sludge pyrolysis is a multi-step process; the activation energy of pyrolysis increased with the pyrolysis conversion rate, and the average activation energy was calculated as 79.59 kJ mol −1 . As the pyrolysis temperature increased, the char yield decreased, the tar yield increased then decreased, and the gas yield increased. At 850 °C, the thermal volatilities of heavy metals followed the sequence Cu < Cr < Ni < Mn < Pb < As < Zn < Cd = Hg. In addition, Cu, Cr, and Ni were seldom involved in migration during pyrolysis while As, Cd, and Hg readily migrated even at low pyrolysis temperatures. The results provide a theoretical basis for sludge pyrolysis technologies and heavy metals migration control." @default.
• W3108824537 created "2020-12-07" @default.
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• W3108824537 date "2021-02-01" @default.
• W3108824537 modified "2023-10-03" @default.
• W3108824537 title "Migration characteristics of heavy metals during sludge pyrolysis" @default.
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• W3108824537 doi "https://doi.org/10.1016/j.wasman.2020.11.018" @default.
• W3108824537 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33279824" @default.
• W3108824537 hasPublicationYear "2021" @default.
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