Influence of Carbonization on Removal of PCBs from PCB-impregnated Insulation Paper using Vacuum Thermal Recycling.
スポンサーリンク
概要
- 論文の詳細を見る
In order to treat PCB contaminated equipment so that they are rendered non-toxic, the attached and or impregnated PCBs must be removed. The Vacuum Thermal Recycling (VTR) method has been demonstrated of its effectiveness to remove PCBs from such impregnated materials. However, decrease in efficiency was suspected due to subsequent adsorption of remaining PCBs into the carbonized material. Therefore, optimization of VTR conditions was conducted in the following two methods.<BR>First, insulation oil that behaves like PCBs were used in the tests to clarify the separation behavior of PCBs from PCB impregnated material. A removing efficiency of above 99.9 % could be achieved between the heating temperatures of 200-270°C. On the other hand, between the heating temperatures of 270-400°C, the remaining amount of insulation oil had increased and it became clear that thermal decomposition of insulation paper has a big influence on the remaining amount of insulation oil. Because of thermal decomposition, paper carbonizes and acts like activated carbon. Therefore its adsorption capability increases and causes a re-adsorption, which has a big influence on the remaining amount of insulation oil.<BR>In the second stage, tests were conducted using real PCBs impregnated paper. The results showed that the behavior of PCBs is similar to that of insulation oil. At 400°C, some re-adsorption of PCBs occurred on the sample. To prevent this re-adsorption, nitrogen gas was purged after heating, to dilute gaseous PCBs that still remained inside the furnace. This method was very effective. The residual PCBs in the insulation paper was reduced from 20 mg/kg to 0.15 mg/kg.
- 日本環境化学会の論文
日本環境化学会 | 論文
- 廃棄物埋立地浸出水および処理水中の無機成分、ジオキサン、フェノール類およびフタル酸エステル類の濃度
- 有機スズ代替船底防汚剤による広島湾北部海域の底質汚染状況
- 広島湾北部における有機スズ代替船底防汚剤による海域の汚染状況について
- 難燃処理済スチレンポリマー中のポリ臭素化ジフェニルエーテルの溶媒抽出及び熱脱着 GC/MS 分析
- プレカラム分離導入システムを用いたダイオキシン類の測定