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Electrodialytic remediation of heavy metal polluted soil: treatment of water saturated or suspended soil
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Electrodialytic soil remediation is a method for removal of heavy metals. Good results have previously
been obtained with both treatment of a stationary, water saturated soil matrix and with remediation of a
stirred suspension of soil in water. The two different setups have different uses. The first as in-situ or
on-site treatment when there is no requirement for fast remediation, as the removal rate of the heavy
metals are dependent on the distance between the electrodes (everything else equal) and in such
application the electrode spacing must have a certain distance (often meters). In the stirred setup it is
possible to shorten the transport route to few mm and to have a faster and continuous process. The
present paper for the first time reports a direct comparison of the two options. The remediation of the
stirred suspension showed faster than remediation of the water saturated soil even without a short
distance between the membranes. The acidification of the suspended soil was fastest and following the
mobilization of heavy metals. This may indicate that water splitting at the anion exchange membrane is
used more efficiently in the stirred setup.
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Italian Association of Chemical Engineering - AIDIC