Development of PCDD/Fs treatment technology by -ray irradiation

Hirota, Koichi; Zhao, C.*

To develop the decompsotion technology for dioxin in analytical wastes, octachlorodibenzo-p-dioxin (OCDD) in ethanol, n-nonane, and toluene was irradiated with -rays to examine its decomposition behavior with a change in toxicity. The results showed that the highest decomposition rate was obtained from OCDD in ethernol, followed by in toluene and in n-nonane. This deocomposition order is corresponding to that for G-value for the formation of solvated electron in the three solvenets, indicating that OCDD was decomposed through reactions with solvated electron. When compared to PCDD decomposition, the order was ethanoltoluenen-nonane. From the fact that 80% of reacted OCDD was dechlorinated in n-nonane, OCDD in n-nonane was reacted with solvated electron and dechlorinated to form lower chlorinated dioxin. Oxidation is the dominant reactions for the irradiation of dioxin in toluene because only 20-30% of reacted OCDD was dechlorinated.