Decomposition And Detoxification Of DXNs
Adsorbed On Various Solid Wastes By
Microwave Plasma Treatment
Author(s)
R. Sasai, M. Jin-no, A. Satoh, Y. Imai & H. Itoh
Abstract
Microwave plasma treatment of the various solid wastes adsorbed with DXNs
was investigated to develop an effective and novel method for in situ
detoxification of DXNs in solid wastes such as incinerator fly ashes of the
municipal wastes (IFA) or used activated carbons (AC). It was found that the
microwave plasma treatment could completely decompose the adsorbed DXNs
into inorganic gases such as Cl2, CO2 and CH4 with low plasma power (250 W)
and short treatment time (< 15 min). Moreover, this decomposition behaviour
did not depend on the kinds of solid wastes adsorbed with DXNs. In the case of
IFA, the treatment time needed was slightly affected by the amount and/or
chemical species of inorganic salt (CuO, CuCl2, Ca(OH)2, CaCl2, etc.) contained
in the IFA at low plasma power region (< 100 W), but this change was negligible
at higher plasma power (> 250 W). The AC obtained after the microwave
plasma treatment exhibited almost the same characteristics of specific surface
area, pore size distribution, and pore volume. Furthermore, the weight loss of
AC due to burning and/or ablation could be scarcely observed. This shows that
the microwave plasma can selectively decompose the organic species adsorbed
on solid matter. Thus, the present microwave plasma treatment was found very
useful not only as a decomposition method of the toxic organic compounds on
solid, but also as a recycling method of the used inorganic solid adsorbents.
Keywords: microwave plasma treatment, DXNs, incinerator fly ash, used
activated carbon, detoxification, recycling.
Keywords
microwave plasma treatment, DXNs, incinerator fly ash, used
activated carbon, detoxification, recycling.
Related Book
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