Column extraction of heavy metals from soils using the biodegradable chelating agent EDDS

  • Hauser L
  • Tandy S
  • Schulin R
 et al. 
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A possible remediation strategy for metal polluted soils is washing
with chelants. Here, the authors compare the efficiency of batch
and column extn. of Cu, Zn, and Pb from three soils using the biodegradable
chelant EDDS. A total of 53-80% of Cu was extd. in batch and 18-26%
in column extn. For Zn, the extractability was 16-50% in batch and
20-64% in columns and for Pb 25-52 and 18-91%, resp. Column leaching
was therefore equally or better suited for Zn and Pb removal. The
longer extn. time in the column resulted in more formations of Fe(III)EDDS
by slow dissoln. of Fe oxides. Zn was uniformly washed from the column,
while Cu and Pb were extd. in the top layers and deposited in the
bottom layers, presumably by biodegrdn. of the metal-EDDS complexes
and slow dissoln. of Fe oxides. Between 18 and 42% of the applied
EDDS was lost through biodegrdn. after 7 wk. In short time expts.,
only 6% of EDDS was degraded. Using EDDS concns. in excess of available
heavy metals caused pronounced leaching of org. matter and clogging
of the column. The authors' results prove that heap leaching using
EDDS is a promising approach to reduce the heavy metal content of
polluted soils. [on SciFinder(R)]

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