METHOD FOR CLEANING DETOXIFICATION TREATMENT OF PCB CONTAMINATED ELECTRIC EQUIPMENT

To provide a method for cleaning detoxification treatment of PCB contaminated electric equipment which can shorten a detoxification treatment time, and can perform detoxification of contamination in the interior of a housing due to a cleaning liquid containing a PCB-containing insulation oil, which is desorbed from an internal element, with a small amount of a cleaning liquid.SOLUTION: This method comprises: an insulation oil discharge process in which an insulation oil A accommodated in the interior of a housing 110 is discharged to the exterior of the housing 110; a cleaning process in which a first cleaning liquid is injected into the housing 110 and the first cleaning liquid is discharged, thereby cleaning the interior of the housing 110; a second cleaning liquid injection process in which a second cleaning liquid B, which can dilute the first cleaning liquid containing the insulation oil A, is so injected into the housing 110 that a liquid level of the second cleaning liquid B becomes lower than a position of the internal element; and a dropping process in which the first cleaning liquid, which contains the insulation oil A remaining in the internal element, is dropped to the second cleaning liquid B. In the second cleaning liquid B injection process, the second cleaning liquid of such an amount that a PCB concentration in the second cleaning liquid after dropping of the first cleaning liquid, which contains the insulation oil remaining in the internal element, thereto becomes a reference value or less is injected.SELECTED DRAWING: Figure 3 【課題】無害化処理時間を短くでき、かつ内部素子から脱離するＰＣＢ含有絶縁油を含む洗浄液による筺体の内部の汚染を少量の洗浄液で無害化できるＰＣＢ汚染電気機器の洗浄無害化処理方法の提供。【解決手段】筺体１１０の内部に収容されている絶縁油Ａを筺体110の外部に排出させる絶縁油排出工程と、筺体１１０の内部に第１洗浄液を注入して、第１洗浄液を排出させることにより、筺体１１０の内部を洗浄する洗浄工程と、絶縁油Ａを含む第１洗浄液を希釈可能な第２洗浄液Ｂを、第２洗浄液Ｂの液面が内部素子よりも低い位置となるように、筺体１１０の内部に注入する第２洗浄液注入工程と、内部素子に残留している絶縁油Ａを含む第１洗浄液を第２洗浄液Ｂに滴下させる滴下工程と、を備え、第２洗浄液Ｂ注入工程において、内部素子に残留している絶縁油を含む第１洗浄液を滴下させた後の第２洗浄液中のＰＣＢ濃度が基準値以下となる量の第２洗浄液を注入する。【選択図】図３