| 摘要 |
PROBLEM TO BE SOLVED: To provide a purification system which purifies contaminated soil in situ by using a purifying functional material, and its purification method. SOLUTION: The purification system has a plurality of highly water-blocking steel sheet piles 2 which are disposed above an impervious layer C to enclose a contaminated area, a plurality of steel pipe piles 1, preferably rotating penetrating steel pipe piles each having a blade at the tip end, which are driven into the contaminated area, and pipe lines 3 which are connected with the steel pipe piles and pump up purified water in the ground to return it into the ground again. The inside of each steel pipe pile is filled with the purifying functional materials, preferably, iron powder. The contaminated area which is an object to be purified (for example, a factory site) is enclosed with the highly water-blocking steel sheet piles to interrupt the inflow of contaminated water from the outside of the site and the outflow of the contaminated water to the outside of the site. A plurality of the steel pipe piles of which the insides are filled with the bagged purifying functional materials and each of which has the inflow port of ground water at the tip end are installed in the ground. After leaving them for the predetermined time, the contaminated water is made to stay in the steel pipes to be changed into the purified water, and the purified water is pumped up by a pump connected to at least one of the plurality of the steel pipe piles. Subsequently the above purified water is injected into the ground again through other steel pipe piles. COPYRIGHT: (C)2005,JPO&NCIPI
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