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The low-temperature thermal treatment to degrade PCDD/Fs contained in fly ash was promoted by alcohol amines in a closed system.Three types of fly ash collected separately from municipal solid waste incinerator, medical waste incinerator and hazardous waste incinerator, were compared.Experimental design was used to investigate the homologue patterns of PCDD/Fs and distribution of the toxic congeners in fly ash from incinerator after thermal treatment promoted by alcohol amines.