Title:
DECONTAMINATION METHOD FOR HEAVY METAL CONTAMINATED SOIL
Document Type and Number:
Japanese Patent JP3689094
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a specific method by which a series of treatment processes from gathering heavy metal contaminated soil at the site till returning the decontaminated soil after removing heavy metals by using a chelating agent, can be properly performed.
SOLUTION: Decontamination method for the heavy metal contaminated soil comprises a process in which the heavy metal contaminated soil 1 is turned to muddy water and then is brought into contact with the chelating agent to combine heavy metals in the muddy water 4 with the chelating agent, a process in which mineral material particles 14 of multi-void structure comprising at least one among kieselguhr, calcined vermiculite, calcined zeolite, and calcined bentonite, are added to the muddy water 4 which is brought into contact with the chelating agent, a process in which the muddy water 4 added by the mineral material particles 14 of multi-void structure is dehydrated and is separated into soil 1a and a heavy metal-combined chelating agent aqueous solution 13a, a process in which separated soil 1b of a heavy metal content below a reference value is returned to the site, and a process in which soil 1c of heavy metal content above the reference value is circulated to the chelating agent combining process.
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Inventors:
Takeshi Uchida
Fumihiro Saito
Fumihiro Saito
Application Number:
JP2003114562A
Publication Date:
August 31, 2005
Filing Date:
April 18, 2003
Export Citation:
Assignee:
Sato Industry Co., Ltd.
Eco Japan Co., Ltd.
Eco Japan Co., Ltd.
International Classes:
A62D3/33; B09B3/00; B09C1/02; B09C1/08; A62D101/43; (IPC1-7): B09C1/02; A62D3/00; B09C1/08
Domestic Patent References:
| JP4263874A | ||||
| JP11244628A | ||||
| JP2003103246A | ||||
| JP4109967A |
Attorney, Agent or Firm:
Takashi Nakahata