難透水性地盤におけるバイオレメディエーションのための浄化促進剤投入方式に関するウォータージェットを用いた現場実証試験

摘要

Injection of hydrogen release compound can enhance bioremediation process of chloroethylenes in situ. In the case of remediating low-permeable formations, difficulties can be induced due to hard permeation of enhancement agent for injection method or dissolution of formation into mud for stirring method. To overcome these difficulties, we proposed an approach that injects hydrogen release compound into slits cut by waterjet with a curtain interval considering the advantage of using planar diffusion based on the theoretical examination. In situ demonstration tests were performed at two contaminated sites with a slit interval of 0.3m. The results demonstrated that for low concentration contamination, the site could be almost completely remediated within 8.5 months, and for high concentration contamination with the maximum PCE concentration of 75mg/L, it could be degraded to below the environmental standard (0.01mg/L) within 2 years. The effectiveness of using waterjet for injecting bioremediation enhancement agent based on planar diffusion was verified through the in situ demonstration tests.