Abstract
This paper summarizes the removal of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in fly ash obtained from industrial waste incinerators using electrochemically-generated homogeneous Ag(II) ion as a mediator. The initial Ag(II) generation experiment showed higher oxidation efficiency (0.018M out of the 0.025M) of Ag(II) at a lower temperature (20°C), which decreases with increasing temperature. Then, the reaction between electrogenerated Ag(II) ion and dioxins was operated at 20°C using a batch reactor for further analysis. First, an experiment examining the removal of a commercial pure 2,3,7,8-TCDD congener solution with a feed concentration of 2.4ng/L in a batch reactor for a 10s using electrogenerated Ag(II) revealed 99.75% removal with a resulting concentration of 1.48pg/L according to high-resolution gas chromatograph/high-resolution mass spectrometry (HRGC/HRMS) analysis (calculated using the UN-EPA method of 1613b). Similar experimental conditions for the removal of fly ash from incinerators with a feed concentration of 58pg-TEQ/g resulted in 6.68pg-TEQ/g, which is an approximately 89% removal efficiency for 10s reaction duration. The developed method is quite promising for the very short time (10s, first time), removal of dioxins in fly ash from an industrial incinerator.
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