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Destruction of polychlorinated naphthalenes by a high-temperature melting treatment (GeoMelt process)
Authors:Takashi Yamamoto  Yasufumi Kai  Hiroaki Nakauchi  Toshiaki Abuku  Yukio Noma
Affiliation:1. National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
2. Showa Denko K.K., 1-3-19 Shiba-Daimon, Minato-ku, Tokyo, 105-8518, Japan
3. Mie Chuo Kaihatsu Co. Ltd., 4713 Yono, Hachiya, Iga, Mie, 518-1152, Japan
4. ISV Japan Ltd., 3-24 Tokiwacho, Naka-ku, Yokohama, 231-0014, Japan
5. Fukuoka Women’s University, 1-1-1 Kasumigaoka, Higashi-ku, Fukuoka, 813-8529, Japan
Abstract:A series of treatment experiments were carried out to evaluate the applicability of a high-temperature melting treatment (GeoMelt process) to the destruction of polychlorinated naphthalene (PCN) formulation. We started with 10-kg-scale experiments in which a small melting furnace was used and then scaled up to a 1-t-scale experiment in which a melting furnace that resembled an actual treatment system was used. These runs were evaluated whether destruction efficiency (DE) of total PCNs was more than 99.999 % and whether concentrations of PCNs and polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDDs/DFs) in vitrified materials, emission gas, and scrubber water were below the target levels. Because DE values and the target levels of PCNs and PCDDs/DFs in these runs were satisfactory, then we carried out a demonstrative experiment using the actual treatment system and confirmed destruction of PCNs. Based on good results of the demonstrative experiment, stock of PCN formulation was successfully treated continuously.
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