It generates the fracture on the underground fusibility and the insolubility due to pneumatic hurakuchiyaringu which accompanies the iron powder injection in order to purify the soil and the ground water which were contaminated after punching the bar hole

摘要

PROBLEM TO BE SOLVED: To provide an inexpensive and durable novel cleaning treatment method which is capable of simultaneously detoxicating the heavy metals and organic halogen compounds in contaminated groundwater on site. SOLUTION: A boring hole 1 is dug down into a contaminated soil land and compressed air is blown into the ground by sealing the ground surface to generate fractures 2 in the weak segments of the ground. Iron powder is blown by the compressed air from the ground surface simultaneously with or after such an operation to form iron powder dispersion layers 4 in the fractures 2. Contaminated permeate 5 passes the iron powder dispersion layers 4 and comes into contact with the iron powder, by which the permeate is detoxicated. The permeated groundwater 6 is accepted in a pit section at the bottom of the boring hole 1.