ELECTROKINETIC REMEDIATION. I: PILOT-SCALE TESTS WITH LEAD-SPIKED KAOLINITE

The authors investigate the feasible and efficient transport of lead under electric fields at pilot scale in three Georgia kaolinite specimens spiked with lead nitrate solution with electrode spacing of 72 cm. Enhancement methods are not used in processing. Two of the tests are performed on specimens spiked with lead at concentrations of 856 mg/kg and 1,533 mg/kg. A third test is performed of a 1:1 mixture of compacted kaolinite and sand spiked with lead at a concentration of 5,322 mg/kg. Lead was transported toward the cathode and precipitated at its hydroxide solubility value within the basic zone in direct contact with the cathode compartment. After 2,950 hours of processing and substantial energy expenditure, 55 percent of the lead removed across the soil precipitated within the last 2 cm close to the cathode, 15 percent remained in the soil before reaching this zone, 20 precipitated on the fabric separating the soil from the cathode compartment, and 10 percent was unaccounted. Heavy metals and species that are solubilized in the anodic acid front can be efficiently transported by electromigration under an electrical field applied across electrodes placed in soils.

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 173-185
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00719330
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 24 1996 12:00AM