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Outstanding Civil Engineering Achievement Award

2011年(平成22年度) Iグループ


A Project for Washing Soil Contaminated by Transformer Insulation Oil using High-Pressure Water


  • 東京電力(株) 東電設計(株) (株)間組 (株)土壌環境プロセス研究所
  • Tokyo Electric Power Company, Tokyo Electric Power Services Co., Ltd., Hazama Corp., Soil Wash & Clean Process Institute Ltd.
The Niigataken Chuetsu-oki Earthquake in 2007 caused transformer insulation oil leakage in Kashiwazaki-Kariwa Nuclear Power Station. The amount of leakage oil was 160kL, and then it contaminated soil of 35,000t near the power house building .
In this project, a new soil washing system using high-pressure water was developed without using of synthetic detergent, and then, the contaminated soil was washed with a high performance in a short term of one year.
This system is appraised to contribute to minimize the amount of washing water and adverse effects on environment by reducing waste soil.

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