Title:
電気的に改良された汚染土壌の原位置電気浄化
Document Type and Number:
Japanese Patent JP4446257
Kind Code:
B2
Abstract:
During in situ electroremediation of soil electric fields generated by electrodes ( 10, 12 ) that are located in the soil are used to move contamination, complexing agents, chemical reagents and/or nutrients through soil or to heat the soil. Control of the voltages and/or currents on or through the electrodes ( 10, 12 ) is used to prevent electrode clogging problems, to reduce unnecessary power consumption and/or to prevent boiling. In one aspect (electrokinetic remediation and electro heating) the current through selected electrodes ( 10, 12 ) is temporarily stepped down if the onset of clogging and or boiling is detected from an increase in the electrical resistances from an electrode into the soil. Preferably an effect of soil resistivity changes on the detection is removed by using sensing electrodes ( 14 a , 14 b) in the soil. In another aspect (elektrokinetic (bio) fence/screen) the voltage or current is adapte dependent on measured groundwater flow speed changes, so that the method remains effective with minimum power consumption. In yet another aspect (electrokinetic phyto remediation) polarity reversals of the current are timed using cumulative current measurements.
Inventors:
Paul Weaveren
Application Number:
JP2005511277A
Publication Date:
April 07, 2010
Filing Date:
December 04, 2003
Export Citation:
Assignee:
SHOWA DENKO K.K.
International Classes:
B09C1/00; B09C1/06; B09C1/08; B09C1/10
Domestic Patent References:
JP2003522019A | ||||
JP2003320363A | ||||
JP5059716A |
Foreign References:
US5433829 | ||||
US5589056 | ||||
US5846393 | ||||
US6145244 | ||||
US6255551 | ||||
US6214202 |
Attorney, Agent or Firm:
Sadao Kumakura
Fumiaki Otsuka
Takaki Nishijima
Hiroyuki Suda
Fumiaki Otsuka
Takaki Nishijima
Hiroyuki Suda