US 11,679,425 B2
Subsurface soil purification method
Kaoru Inaba, Inzai (JP); Yuji Yamazaki, Inzai (JP); Takaaki Shimizu, Inzai (JP); Nobuyasu Okuda, Inzai (JP); Yasuhide Furukawa, Inzai (JP); Tomohiro Nakashima, Inzai (JP); Haruka Kiyotomo, Inzai (JP); Kazuhiro Mukai, Inzai (JP); Masafumi Funakawa, Tokyo (JP); Ai Hasegawa, Tokyo (JP); Keisuke Omura, Tokyo (JP); and Kota Tanabe, Tokyo (JP)
Assigned to TAKENAKA CIVIL ENGINEERING & CONSTRUCTION CO., LTD., Tokyo (JP)
Appl. No. 16/346,824
Filed by TAKENAKA CORPORATION, Osaka (JP); and TAKENAKA CIVIL ENGINEERING & CONSTRUCTION CO., LTD., Tokyo (JP)
PCT Filed Aug. 29, 2017, PCT No. PCT/JP2017/031016
§ 371(c)(1), (2) Date May 1, 2019,
PCT Pub. No. WO2018/087995, PCT Pub. Date May 17, 2018.
Claims priority of application No. JP2016-217959 (JP), filed on Nov. 8, 2016.
Prior Publication US 2020/0061683 A1, Feb. 27, 2020
Int. Cl. B09C 1/00 (2006.01); B09C 1/10 (2006.01); B09C 1/02 (2006.01); B09C 1/08 (2006.01)
CPC B09C 1/10 (2013.01) [B09C 1/02 (2013.01); B09C 1/08 (2013.01); B09C 2101/00 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A subsurface soil purification method comprising:
warming an activator liquid, for stimulating decomposer microorganisms that decompose a contaminant in subsurface soil, to a higher temperature than a groundwater temperature;
feeding the activator liquid into the subsurface soil by injecting the activator liquid into an injection well; and
forcing air into the injection well,
wherein forcing air into the injection well comprises feeding the air into the subsurface soil from a position in the injection well that is lower than a position in the injection well for feeding the activator liquid; and
wherein feeding the activator liquid into the subsurface soil and forcing air into the injection well are performed together.