埋立15年間における乾電池の腐食と水銀移動 Fifteen-Year Experiment on Corrosion and Mercury Behavior of Dry Batteries in Landfill Lysimeters
本研究は小型埋立実験槽を用いて15年間にわたって, 水銀を含む使用済み乾電池の埋立実験を行い, 実験槽を定期的に逐次解体し, 埋立地内での乾電池の腐食状況や水銀の移動状況を検討した。<BR>埋立実験を行った乾電池の腐食は, 埋立2年間が埋立構造の違いによる浸出水の水質と, 乾電池の保持電圧による影響が大きい。保持電圧が消費された後は埋立の長期化が腐食の寄与率を高くした。また, 乾電池中の水銀は浸出水への流出は認められなかったが, 気化水銀として流出し廃棄物層へ移動していた。しかし, 埋立実験槽内の水銀は埋立15年後も, 乾電池周辺の中層域が高く, 上・下層へ移動しにくい傾向が認められた。
We conducted experiments on dry batteries that contained mercury and were buried in waste in small lysimeters for 15 years. We dismantled the lysimeters after 1 year, 2 years, 7 years, and 15 years from the start of the experiment, and measured the corrosion levels of the dry batteries and the behavior of mercury leakage from them into the waste layers.<BR>The corrosion of the dry batteires in landfill during the first two years was caused mainly by the leachate generated in the different landfill types, and electrolytic corrosion caused by the retention voltage of the dry batteries.<BR>After those initial years, during which the retention voltage was consumed, the period of time in the landfill became the main factor for the corrosion of the dry batteries. The longer the dry batteries remained in the landfill, the more extensive the electrolytic corrosion.<BR>We confirmed a little migration of mercury into leachate ; however, we also noted that mercury vapor was generated that migrated into waste layers.<BR>Even after 15 years from the start of the experiment, mercury levels near the dry batteries were still high. However, the mercury levels just above and just below the waste layers containing the dry batteries were low. From these results, we concluded that mercury has a tendency to remain near dry batteries even after many years.
- 廃棄物学会論文誌 = Journal of the Japan Society Waste Management Experts
廃棄物学会論文誌 = Journal of the Japan Society Waste Management Experts 15(4), 283-293, 2004-07-31
Japan Society of Material Cycles and Waste Management