Title:
汚染土壌の浄化処理方法
Document Type and Number:
Japanese Patent JP4786046
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for cleaning polluted soil which can clean the soil polluted by PCBs, etc., safely, surely, and economically and detoxify the pollutants easily. SOLUTION: The method for removing the pollutants such as PCBs from the soil has a process in which an organic solvent is added to the soil, and the pollutants are extracted from the soil and a process in which the solvent is separated from the soil. In the extraction process, a hydrocarbon solvent whose specific gravity is smaller than that of water is used, and a hydrophilic organic solvent is added as necessary to mix the polluted soil with the organic solvents. In the separation process, after water being added further, the mixture is separated into the hydrocarbon solvent and an aqueous solvent, and the soil, the pollutants are extracted/removed, and simultaneously the quantity of the hydrocarbon solvent containing the pollutants which is left in the soil can be controlled. In the method for cleaning the polluted soil, the hydrophilic organic solvent which is effective even in soil of a high water content is used in the extraction process.
Inventors:
Ichiro Watanabe
Kazuyoshi Suzuki
Kazuyoshi Suzuki
Application Number:
JP2001081262A
Publication Date:
October 05, 2011
Filing Date:
March 21, 2001
Export Citation:
Assignee:
Nittetsu Environmental Engineering Co., Ltd.
International Classes:
B09C1/02; B01D11/02; B09B3/00; B09C1/00; B09C1/04; B09C1/08; C02F11/00; C09K17/14; C09K101/00
Domestic Patent References:
| JP2103281A | ||||
| JP11005076A | ||||
| JP11005075A | ||||
| JP2001096267A | ||||
| JP11000639A | ||||
| JP10286556A | ||||
| JP5131038A | ||||
| JP6503261A |
Attorney, Agent or Firm:
Toshieko Kondo