The Effects of Heating Time and Temperature on <I>de novo</I> Synthesis of PCBs and CBzs in Fly Ash by Particle Size

概要

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In order to clear clarify the mechanism of <I>de novo</I> synthesis of PCBs and Chlorobenzenes in fly ash, the effects of temperature and reaction time on the generated amount of PCBs and CBzs were investigated using two kinds of fly ash divided by particle size. The highest amount of PCBs were generated at both 350 and 375°C. On the other hand, the two peaks of the generated amounts in CBzs were recognized at 350 and 475°C, and the amounts in fly ash with the particle size of over 500μm were higher than those in fly ash with the particle size of 44-500μm in all experimental temperature regions. In PCBs and CBzs, both fly ashes generated higher chlorinated compounds at lower temperature range and lower chlorinated compounds at higher temperature range, respectively. It was found that the peak of generated amounts of each homologue shifted depending on the temperature. According to the effect of reaction time on the amount of PCBs and CBzs, the amount of PCBs increased with the increase of time by 120 min., but did not depend on the particle size of the fly ash. At 360 min heating, the amount in CBzs achieved the maximum in the fly ash with the particle size of 44-500μm but continued to form in the fly ash with the particle size of 44-500μm.
一般社団法人廃棄物資源循環学会の論文