Method of cleaning heavy metals-containing soil

Details Method of cleaning heavy metals-containing soil Method of cleaning heavy metals-containing soil

2005-09-09

2010-11-09

Lorengo, Jerry (Department: 1793)

Hazardous or toxic waste destruction or containment

Processes for making harmful chemical substances harmless,...

By reacting with chemical agents

C588S313000, C588S400000, C588S407000, C210S602000, C435S262000, C435S262500, C435S267000

Reexamination Certificate

active

07829754

ABSTRACT:
A soil cleaning method (phytoremediation) of absorbing a contaminating substance contained in a contaminated soil by a plant to clean the soil. An object of the present invention is to provide a method of cleaning a contaminated soil which performs cleaning of a soil containing heavy metals in a shorter term than before and, at the same time, utilizes phytoremediation having little influence on the environment. The object is attained by absorbing heavy metals by a plant of Polygonaceae family,Fagopyrumgenus, and, at the same time, adding a biodegradable chelating agent to a contaminated soil in order to assist the absorption. And, a biodegradable chelating agent having the high heavy metal dissolving out ability not only enhances the cleaning efficacy but also reduces secondary influence on the environment.

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Bucheli-Witschel et al. “Environmental fate and microbial degradation of aminopolycarboxylic acids”. FEMS Microbiology Reviews 25 (2001) 69-106.
Tandy et al. “Extraction of heavy metals from soils using biodegradable chelating agents”. Environmental Science & Technology. vol. 38, No. 3, (Dec. 23, 2003) 937-944.
The summary of the Ministry of the Environment, “Summary of Examination Results Regarding Soil Contamination Examination-Subject Cases and Circumstances of Response thereto in 1999, ” Mar. 2001 together with the English translation thereof (3 sheets).

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